p*********e
发帖数: 32207 | 1 函道比跟这个不是一码事
说的是涡扇发动机外涵道跟内涵道的流量比
你可以google bypass ratio wiki看一下 |
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p*********e
发帖数: 32207 | 2 bypass ratio我印象里是进气量的比值
这个跟推力比值肯定是直接相关的,但不好说是严格线性相关
内涵道的进气要被级级压缩并燃烧膨胀做功再向后喷出
从这个角度上看单位进气量的贡献应该明显高于外涵道单独被吹出去的进气
但另一方面内涵道燃气还要(可能有相当大比例)用于驱动风扇跟压缩机
所以最后实际作为推力喷出的部分的比例如何也不能简单下结论
似乎没法直接通过函道比直接判断内外涵道的推力贡献,要量化的话
另外不同速度不同工况下函道比固定的一个发动机,内外涵道的贡献也可以差别很大 |
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N******p
发帖数: 2777 | 3 恩，bypass ratio什么意思我知道。不过以前没有看到过内外涵道推力比值的数据。
内涵道应该对空气加速作用比较大，再加上燃烧产物的作用，单位空气质量应该能产生
更大的推力。lulu说的CFM56涵道比在5-6:1。如果内涵道推力相对涵道比大一点的话，
外内涵道推力在3.5:1(78%:22%)看起来比较靠谱。希望lulu再来给澄清一下。 |
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x*****o
发帖数: 2505 | 4 压力过高安全壳有破裂/爆裂的危险, 可是还不足以推动汽轮机正常工作,这个逻辑上更
讲不通吧。
我又在网上看了一些BWR的科普,似乎找到答案. 在停堆时,主蒸汽阀自动关闭,涡轮发电
机被隔离.蒸汽从旁路阀门(bypass valve)直接到冷凝器(condensator),变成水后回到
压力容器. 这个过程应该是自动发生,估计是为了防止损坏涡轮发电机.
从福岛的结构框图来看, 蒸汽在冷凝器是用循环海水来冷却.但停电之后,循环海水也没
有了.
随着壳内温度和压强升高,只好放汽.
时间间隔）。结果造成爆炸。 |
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N********n
发帖数: 8363 | 5 ... or sorta. You pay the semi price and bypass the annoying regulators. |
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e*******l
发帖数: 1269 | 6 看看这家伙的文章，欧洲的左派，人才阿。
http://www.guardian.co.uk/commentisfree/2012/feb/07/syria-inter
**********************************************
Intervention in Syria will escalate not stop the killing
Seumas Milne
Russia and China blocked a bid to force regime change. But a negotiated
settlement is the only way out of civil war
There is no limit, it seems, to the blood price Arabs have to pay for their
"spring". After the carnage in Egypt, Yemen, Bahrain and Libya, Syria's 11-
month-old uprising grows ever m... 阅读全帖 |
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m******e
发帖数: 536 | 7 【 以下文字转载自 Military 讨论区 】
发信人: meditate (meditate), 信区: Military
标 题: 新出炉国产大型运输机卫星照片
发信站: BBS 未名空间站 (Sat Jan 5 00:52:31 2013, 美东)
新出炉国产大型运输机Y-20卫星照片,由美帝卫星于去年１２月２５日在西安阎良机场
拍到。文章贴在下面了。
Satellites Spot China’s Mysterious New Warplane
By David Axe01.04.136:38 PM
A week after the publication of blurry photographs depicting what appears to
be China’s first long-range jet transport, Danger Room has obtained
satellite imagery of the new plane at an airfield in central China.
The images, acquired by the... 阅读全帖 |
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c****3
发帖数: 6038 | 8 我一直觉得物理学家最大的caveat在于知识面不够宽
知识面大小直接正比于你专业知识的发挥效果
QED君你物理直觉不错 分析也算是靠谱
可是在这个问题上却没抓住关键 对热力学牵强附会了
这是因为你的知识面没有覆盖到关键信息
今天我这个虽学物理
可是连PhD都没资格做的GPA 2.6三脚猫物理爱好者小留就斗胆献丑
给机智的QED君科普一下
希望QED君以后做人要么谦虚一些 要么不断学习扩大自己的知识面
特别是工程常识 以后说话前多想想
不要给我们搞物理的丢人
特别是别在聪明的萌妹子面前丢人 萌妹子要是发现了
不会说什么 可是我们物理学家的形象就全毁了
QED君你知识面比今天大得越多 以后就可以越狂
以致最后可能达到费曼的程度 想搞多少妹子都可以
QED君的知识面可不能跟菌斑众将比
从本帖看菌斑众将在这个问题上没有一个比QED君更靠谱的
回到楼主的问题"为什么有些大运输机是螺旋桨驱动的"
要回答这个问题 得知道一个关键事实
现代大型飞机 没一个不是我们俗称的喷气机 全部用的是gas turbine
也就是涡轮机
最后的大型活塞机 到B-29 DC-3就绝嗣了
现代活塞螺旋桨飞机 全部是小型... 阅读全帖 |
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发帖数: 1 | 9 VTOL项目总师Kevin Renshaw； F35垂直起降技术（3BSD）来源于通用的Model 200，与
雅克141无关
F-35B Lightning II Three-Bearing Swivel Nozzle
By Kevin Renshaw Posted 12 August 2014
The Convair Model 200 was proposed in June 1972 to respond to the US Navy
request for designs for a fighter/attack aircraft for the sea control ships.
The VTOL aircraft would have used a PW401 engine with an afterburning 3BSD
plus twin Allison XJ99 lift engines located behind the cockpit for added
vertical lift forward of the center of gravity to b... 阅读全帖 |
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m******1
发帖数: 19713 | 10 Coakley: DOMA Interferes With Mass. Marriage
By Kenneth Harvey
MARTHA COAKLEY 202001 X390 (GETTY) | ADVOCATE.COM
On Thursday, Massachusetts attorney general Martha Coakley said the Defense
of Marriage Act, the law that defines marriage as a union between a man and
a woman, interferes with her state's right to regulate the institution, the
Associated Press reports.
Coakley is asking the federal government to bypass a trial and give a
summary judgment, which would rule the law unconstitutional wit |
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g********d
发帖数: 4174 | 11 Posted on Advocate.com December 16, 2010
Reid Schedules DADT Vote
By Kerry Eleveld
HARRY REID X390 (GETTY IMAGES) | ADVOCATE.COM
Senate majority leader Harry Reid Thursday evening scheduled a vote on the
stand-alone "don't ask, don't tell" repeal bill, which is now likely to come
to vote as early as Saturday morning.
The move came after Reid pulled the Omnibus government funding bill, fearing
that Democrats could not garner the support to move the bill. Reid then
filed for a cloture vote on bot... 阅读全帖 |
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g********d
发帖数: 4174 | 12 Why timing is crucial in the ongoing same-sex marriage cases
Rutgers law professor Carlos Ball argues that it would be better for
marriage equality supporters if the Supreme Court hears a DOMA case before
it considers Perry v. Schwarzenegger.
The following is an essay for our same-sex marriage symposium by Carlos A.
Ball, professor at the Rutgers University School of Law (Newark). Professor
Ball is the author of The Right to be Parents: LGBT Families and the
Transformation of Parenthood (NYU Pr... 阅读全帖 |
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l****u
发帖数: 8729 | 13 【 以下文字转载自 Hubei 讨论区 】
发信人: bypassing (飘过), 信区: Hubei
标 题: 红菜苔该什么时候下种？
发信站: BBS 未名空间站 (Thu Feb 24 21:38:56 2011, 美东)
买了点儿红菜苔种子，请问种过的老乡，我这里是东北，
该什么时候下种啊？幼苗有什么要注意的吗？先谢啦！ |
|
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D*V
发帖数: 3096 | 15 http://rt.com/news/syria-russia-iran-annan-741/
Syria is nothing but a pawn in a global geopolitical game, set to be
sacrificed in order to curb the expansion of China, Russia and Iran,
political analyst Jamal Wakim tells RT.
As the international community warily waits to see whether Kofi Annan’s
ceasefire plan is going to work in Syria, Lebanese International University
professor Jamal Wakim believes the West has still not given up its intention
to topple President Bashar Al-Assad.
Reports on c... 阅读全帖 |
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D*V
发帖数: 3096 | 16 HOPE MILLS, N.C. (AP) — North Carolina deputies say they used a stun gun on
a woman who blocked a McDonalds drive-thru for 20 minutes after employees
refused to serve her because she broke in line.
Authorities say 37-year-old Evangeline Lucca bypassed the order screen and
the line at the restaurant in Hope Mills, about 60 miles south of Raleigh,
and pulled directly up to the pick-up window Friday afternoon.
Cumberland County deputies say employees refused to take her order and told
her to go to ... 阅读全帖 |
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t***h
发帖数: 5601 | 17 What is reconciliation?
Reconciliation is a process, limited to budget-related bills, that bypasses
the Senate rule on 60 votes being needed to end debate, known as cloture. By
using reconciliation, only a majority vote would be needed to advance a
bill.
It was established by the Congressional Budget Act of 1974, in part, to
lower the bar for passing tough deficit-reducing legislation.
Debate on reconciliation measures in the Senate is limited to 20 hours.
According to a report by the Congressio |
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q******j
发帖数: 577 | 18 I agree that Palin was joking when she said that but she was trying to use a
joke to bypass expressing her foreign policies directly (she might not have
a clue or a clear plan at that point since she was selected by McCain in
such a hurry but the campaign was at that stage that the voters really
needed to know her plan how to manage a country, not a state). In a regular
talkshow I think it showed her spontaneous wit (using a light joke to avoid
her weakness) but it was in the middle of a white- |
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r*********9
发帖数: 489 | 19 ☆─────────────────────────────────────☆
kicolly (小苦妹) 于 (Wed Nov 3 00:32:09 2010, 美东) 提到:
发100个夜宵
☆─────────────────────────────────────☆
cougarjx (cougar) 于 (Wed Nov 3 00:32:20 2010, 美东) 提到:
re
☆─────────────────────────────────────☆
mathematica (anti-America) 于 (Wed Nov 3 00:32:30 2010, 美东) 提到:
re
☆─────────────────────────────────────☆
mplus (McLovin) 于 (Wed Nov 3 00:32:57 2010, 美东) 提到:
☆─────────────────────────────────────☆
macrowave (每天按时吃饭刷牙洗澡) 于 (Wed Nov 3 00... 阅读全帖 |
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l****z
发帖数: 29846 | 20 By John Tabin on 1.29.11 @ 1:50PM
Robert Kagan is co-chairman of the bipartisan Working Group on Egypt, and
earlier this week he noted to Laura Rozen of Politico that "one thing I have
been most struck by in meeting with [U.S. officials] at all levels over the
past year is that as of yesterday, they have no plan in any direction."
No kidding. Administration statements this week have been an incoherent mush.
But why is Obama winging it? It didn't have to be this way.
During the Bush years the US ... 阅读全帖 |
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l****z
发帖数: 29846 | 21 WASHINGTON—The Senate on Wednesday voted against repealing the health-care
overhaul but approved a measure eliminating a tax requirement that had irked
small businesses.
In a debate reshaped by this week's court strike against the law, the Senate
voted 51-47 against repeal. All of the chamber's Democrats who were present
and one independent who caucuses with them voted against it, and every
Republican voted for it. The measure, which Republicans tacked on to an
unrelated aviation bill, had been ... 阅读全帖 |
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l****z
发帖数: 29846 | 22 Uri Friedman Aug 11, 2011 16,
While the rioters in England this week have looted shops selling shoes,
clothes, computers, and plasma televisions, they've curiously bypassed one
particular piece of merchandise: books. The Economist observes that while
rioters have a centuries-old history of book burning, "books are losing out
to high-end jeans and Apple-made gadgets" in London, with the Waterstone's
bookstore chain emerging unscathed and the WH Smith chain reporting only one
incident (some stores... 阅读全帖 |
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l****z
发帖数: 29846 | 23 By Rabbi Aryeh Spero
What if a Muslim country, such as Iran, launched a nuclear attack against us
, or if agents aligned with Pakistan using dirty bombs were to attack
America? Would Barack Hussein Obama retaliate with nuclear force, as has
been our stated policy since the 1950s? Would he even unleash a barrage of
non-nuclear shock and awe that would level those countries so that they'd be
incapable of striking a second time?
When queried in Japan in November 2009, Mr. Obama declined to defend... 阅读全帖 |
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l****z
发帖数: 29846 | 24 (Reuters) - Louisiana Governor Bobby Jindal, seen as a rising star in the
Republican Party, won re-election on Saturday as voters largely ignored his
nine poorly funded challengers.
"You've chosen to give me another four years as your governor," he told
supporters at his Baton Rouge campaign headquarters less than an hour after
polls closed. "We've got a lot more work to do over these next four years."
With more than 99 percent of precincts reporting, Jindal carried 66 percent
of the vote with h... 阅读全帖 |
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l****z
发帖数: 29846 | 25 By Mark J. Fitzgibbons
President Obama's proclamation on Monday that he "can't wait" for
congressional action to help underwater homeowners raises two questions.
If he already had the legal authority to take action, then why did he wait?
Some may frame the second question this way: does Obama's plan exceed his
constitutional authority? Perhaps the better way to ask the second question
is whether the Obama plan is unlawful.
Either way, I can't wait for Congress to conduct some oversight hearings... 阅读全帖 |
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l****z
发帖数: 29846 | 26 President Obama’s highly-touted green jobs program -- born out of his 2009
stimulus package -- has spent more than $111 million to train 18,000 people
who still haven't landed a job.
Elliot P. Lewis, the assistant inspector general of the Labor Department,
laid out his findings Wednesday at a House Oversight and Government Reform
subcommittee hearing entitled "The Green Energy Debacle: Where Has All the
Taxpayer Money Gone?"
The Labor Department awarded $490.1 million of the $500 million it rece... 阅读全帖 |
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l****z
发帖数: 29846 | 27 Sunday, 01 Jan 2012 09:00 AM
The volatile Republican presidential race in Iowa will come down to which
way an enormous chunk of undecided voters breaks in the coming days.
With the first-in-the-nation voting of the 2012 race for the White House
looming Tuesday, Mitt Romney is contending for victory in a state that
eluded him four years ago, while Rick Santorum — a hero among social
conservatives — surges and libertarian-leaning Ron Paul slides in a contest
that remains incredibly fluid.
With man... 阅读全帖 |
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l****z
发帖数: 29846 | 28 Posted by Rick Rice
January 5, 2012
… when you’re The Won:
ObamaPushing the limits of his recess appointment powers, President
Obama on Wednesday bypassed the Senate to install three members of the
National Labor Relations Board and a director for the controversial new
Consumer Financial Protection Bureau – moves Republicans said amounted to
unconstitutional power grabs.
Mr. Obama said the appointments, which he previewed during a campaign-
style speech in Ohio, were necessary because Se... 阅读全帖 |
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l****z
发帖数: 29846 | 29 http://www.nytimes.com/2012/01/22/business/apple-america-and-a-
The New York Times
When Barack Obama joined Silicon Valley’s top luminaries for dinner in California last February, each guest was asked to come with a question for the president.
But as Steven P. Jobs of Apple spoke, President Obama interrupted with an inquiry of his own: what would it take to make iPhones in the United States?
Not long ago, Apple boasted that its products were made in America. Today, few are. Almost all of the 70 ... 阅读全帖 |
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l****z
发帖数: 29846 | 30 Taking away the guns is how to enslave the people
by Raquel Okyay
01/21/2012
Gun control advocates have it all wrong. They believe the Constitution is a
document and agreement meant to be twisted and turned. They believe it
grants rights to politicians and lawmakers, when it does just the opposite.
They believe scare tactics will convince us that placing burdens on gun
owners will prevent violent crimes, when all the evidence suggests otherwise
.
You see the Constitution governs the government.... 阅读全帖 |
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l****z
发帖数: 29846 | 31 Hollywood actress Meryl Streep recently hitched a ride on a Chinese
businessman’s private jet to Beijing. Once there, she met up with
idiosyncratic writer-director Joel Coen and Raise the Red Lantern director
Zhang Yimou to promote “China’s exploding film industry.”
Zhang, who served as the artistic director for both the 2008 Beijing Olympic
Games and the lavish 60th anniversary celebrations of the Chinese Communist
Party, also unveiled his remake of Coen’s influential first film – Blood
Simple.... 阅读全帖 |
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l****z
发帖数: 29846 | 32 Two stories in one day taken together add up to a de facto reversal of
current immigration law, and effectively declare open borders for non-
criminal illegal aliens. First the Obama administration plans to grant
amnesty to young illegal aliens.
WASHINGTON (AP) — The Obama administration will stop deporting and
begin granting work permits to younger illegal immigrants who came to the U.
S. as children and have since led law-abiding lives. The election-year
initiative addresses a top priority... 阅读全帖 |
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f*********g
发帖数: 1637 | 33 Inside the campaign: How Mitt Romney stumbled - POLITICO.com Print View
Stuart Stevens, Mitt Romney’s top strategist, knew his candidate’s
convention speech needed a memorable mix of loft and grace if he was going
to bound out of Tampa with an authentic chance to win the presidency. So
Stevens, bypassing the speechwriting staff at the campaign’s Boston
headquarters, assigned the sensitive task of drafting it to Peter Wehner, a
veteran of the last three Republican White Houses and one of the part... 阅读全帖 |
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l****z
发帖数: 29846 | 34 As Obama spends his last few days campaigning in states he should've wrapped
up weeks ago, like Wisconsin and Nevada, The Daily's Dan Hirschhorn is
reporting that Mitt Romney sees Big Blue Pennsylvania as close enough to be
in play. I've just confirmed the visit with the Romney campaign:
Details are still being determined and with scheduling for the final
days of the campaign still fluid, it’s possible Romney could still bypass
the state. But two top Pennsylvania Republican officials and a R... 阅读全帖 |
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d********f
发帖数: 43471 | 35 参见法国，其实总统要加税很容易的，可以bypass congress |
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L****n
发帖数: 12932 | 36 that's exactly true. Illinois is at the brink of bankruptcy, the state is
nearly 10 months behind on medicaid payment. Many universities relying on
state support is feeling the pinch of short funding. have to cut faculty,
cut scholarship and raise tuitions. meanwhile the state is paying for these
fatty's gastric bypass, lap band to loose weight. How ironic is that? |
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l****z
发帖数: 29846 | 37 Tuesday I try very hard to like Barack Obama. And sometimes he helps me out
. For example, at the beginning of his State of the Union address yesterday,
he made what seemed to me to be some sense about the budget. And he offered
excellent free advice to the GOP. Why, he asked, should we hamstring all of
our other attempts to work on the budget crisis because some of the GOP are
trying to protect the tax breaks of the very richest among us? Why is the
GOP going to the mat to defend the richest p... 阅读全帖 |
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l****z
发帖数: 29846 | 38 While his plan to lower the corporate tax rate to 28% from 35% might help
the overall economy, it doesn’t particularly help small businesses.
Kathleen Hoffelder
President Barack Obama called for a number of solutions to the United States
’s tax problems last night in his State of the Union speech to Congress. In
particular, he attempted to appeal to small businesses with a plea for
simplicity.
“The American people deserve a tax code that helps small businesses spend
less time filling out complic... 阅读全帖 |
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l****z
发帖数: 29846 | 39 GOP Proposal on Canceled Coverage Garners 39 Votes From Across Aisle Despite
Obama Veto Threat
By COLLEEN MCCAIN NELSON, SIOBHAN HUGHES and JON KAMP CONNECT
Updated Nov. 15, 2013 9:57 p.m. ET
More than three dozen House Democrats rebuffed a White House veto threat and
backed a Republican plan to change the health-care law, underscoring the
tensions among members of President Barack Obama's party a day after he
proposed his own fix to tamp down complaints.
The Republican plan, a response to uneas... 阅读全帖 |
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T*********I
发帖数: 10729 | 40 http://www.reuters.com/article/2014/01/26/us-usa-obama-speech-r
(Reuters) - U.S. President Barack Obama's strategy to bypass Congress this
year with executive orders to advance his policy agenda received a cold
reaction on Sunday from Republican leaders, who accused the White House of
arrogance and sidestepping the political process.... |
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c******i
发帖数: 4091 | 41 Medicare Paid A Tiny Group Of Doctors A Whopping $1.5 Billion
Associated Press RICARDO ALONSO-ZALDIVAR, ASSOCIATED PRESS
APR. 9, 2014, 6:24 AM 773 1
inShare
EMAIL MORE
doctors
Flickr/libertygrace0
WASHINGTON (AP) — Medicare paid a tiny group of doctors $3 million or more
apiece in 2012. One got nearly $21 million.
Those are among the findings of an Associated Press analysis of physician
data released Wednesday by the Obama administration, part of a move to open
the books on health car... 阅读全帖 |
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l****z
发帖数: 29846 | 42 Obama: Dems’ Troubles Have Nothing To Do With My Policies
By Tim Cavanaugh
May 9, 2014 12:17 AM
During his fundraising trip to Los Angeles Wednesday, President Obama
discovered anew that the United States is in bad shape, and he was again
left in puzzlement about what could be the cause.
“You get a self-fulfilling prophecy,” the president told supporters,
urging them to help Democrats avoid potentially significant losses in both
houses of Congress in the November midterm elections. “The people w... 阅读全帖 |
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l****z
发帖数: 29846 | 43 Peter Lucas: Obama's 'Mariel boatlift'
By Peter Lucas
Updated: 07/08/2014 08:26:05 AM EDT1 Comment
President Barack Obama said he will send some of the 50,000 children who
illegally crossed the border back to their homes in Central America; the
problem is nobody believes him.
The president has gone rogue.
Certainly John Boehner doesn't believe the president, and that is why the
Republican-controlled House is blocking action on Obama's immigration-reform
bill, which they call amnesty. If Obama ... 阅读全帖 |
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l****z
发帖数: 29846 | 44 A top IRS official considered going public with the agency’s targeting of
conservative groups at a hearing just months before the 2012 presidential
election but ultimately decided against revealing the bombshell news,
according to a new report from a GOP-led House committee.
Then-Deputy Commissioner Steven Miller wrote in an email in June 2012, about
a month before a House Ways and Means subcommittee hearing, that he was
weighing whether to testify to “put a stake” in the “c4” issue --
apparentl... 阅读全帖 |
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a*********a
发帖数: 3656 | 45 the majority opinion does acknowledge the following (page 14):
"The Affordable Care Act contains more than a few examples of inartful
drafting. (To cite just one, the Act creates three separate Section 1563s.
See 124 Stat. 270, 911, 912.) Several features of the Act’s passage
contributed to that unfortunate reality. Congress wrote key parts of the Act
behind closed doors, rather than through “the traditional legislative
process.” And Congress passed much of the Act using a complicated budgetary
... 阅读全帖 |
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l****z
发帖数: 29846 | 46 Trump is at it again… kicking butt and taking names. The Donald is knocking
yet another giant to their knees with his unfiltered soapbox…
GOP presidential front-runner Donald Trump is insisting that Apple
unlock the iPhone of one of the shooters in the San Bernardino, Calif.,
terrorist attack.
“To think that Apple won’t allow us to get into her cellphone,” Trump
said on “Fox and Friends” Wednesday morning. “Who do they think they are
? No, we have to open it up.”
The FBI has been una... 阅读全帖 |
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x****d
发帖数: 2239 | 47 你有读court order 吗？
"The court is ordering the company to “bypass or disable” a feature that
automatically wipes an iPhone clean of all its data after 10 incorrect
password attempts have been entered. This is a standard feature on iPhones."
This is a slippery slope. Once you open this precedent, where do you draw
the line? |
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j*****v
发帖数: 7717 | 48 where did it say for ALL iphones?
and why they have to even bring this to court?
did FBI ask them to disable/bypass this feature for ALL iphones in the first
place?
." |
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l****z
发帖数: 29846 | 50 去从军吧, 这个可以让你skip绿卡, 直接成为美国公民
现在还有一千多个名额, 要报名的必须赶紧了.
https://my.goarmy.com/info/form/GetBrcFormRedirectByUrl.do?url=
MILITARY ACCESSIONS VITAL TO THE NATIONAL INTEREST (MAVNI)
WHAT IS MAVNI?
Military Accessions Vital to the National Interest (MAVNI) is a recruiting
program that allows legal non-citizens with in-demand skills to join the
Army in exchange for expedited U.S. citizenship.
Individuals who join the Army through this program are able to move from non
-immigrant visa or asylee/refugee/Te... 阅读全帖 |
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