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发帖数: 29576 | 1 ULA的新Vulcan火箭要只回收一级发动机，燃料罐就扔了，发动机分离后打开一个防热
罩，然后降落伞减速，直升飞机半空中捕捉。
A sample illustration of mid-air recovery of main engine section.
ULA chief explains reusability and innovation of new rocket
CAPE CANAVERAL — United Launch Alliance will salvage the main engines
through a mid-air recovery plan and reuse them again aboard the company’s
new Vulcan rocket, saving 90 percent in booster propulsion costs, the
company announced Monday.
It is dubbed SMART Reuse, or Sensible Modular Autonomous Return Technology,
that will see the engine section disengage after staging is completed.
“We will cut them off, we will return them to the Earth using an advanced
inflatable hypersonic heat shield and then … we will recover them in mid-
air, bring them home to the factory, quickly recertify them and then plop
them right under the next booster in line,” said ULA President and CEO Tory
Bruno.
“This will take up to 90 percent of the propulsion cost out of the booster.
And this is just the beginning.”
The engines represent a quarter of the first stage’s overall weight and 65
percent of the booster cost, according to ULA.
“This is a distinctly separate approach from what other people are doing,”
Bruno said. “This allows us to avoid adding complex, expensive, heavy and
performance-killing subsystems to a rocket in order to bring entire stages
back that then experience complicated and expensive logistics to recover
them. Instead, we took a systems engineering approach to what on the rocket
is actually valuable.”
A parafoil will be used to slow the descending engine package to a speed
slow enough for a helicopter to pluck it out of the sky.
Depending on the launch trajectory, the helicopter will either deliver the
engines back to the launch site or onto a waiting ship.
“This new rocket … is going to take the best parts of Delta and Atlas and
combine them with new and advanced technology to provide a rocket that’s
not just reliable and certain as Atlas has been, but also much more powerful
, higher performance, greater flexibility and significantly more affordable,
” Bruno said.
Powered by two Blue Origin BE-4 clean-burning, methane-fueled main engines,
the Vulcan rocket will launch on 1.1 million pounds of thrust from either
Cape Canaveral in Florida or Vandenberg Air Force Base in California
starting in 2019.
“(Blue Origin) is going to bring into an American-built rocket the advanced
oxygen-rich staged combustion engine cycle that has yet to be produced in
the United States. Much higher efficiency, much higher performance. They
will replace the venerable RD-180s,” Bruno said.
ULA is monitoring Blue Origin’s progress and has Aerojet Rocketdyne’s AR-1
kerosene engine as a replacement option, if necessary.
The first stage booster is 20 percent more powerful than the same stage on
Atlas. The RD-180 produced 860,000 pounds of thrust. Thew new stage also
features stretched fuel tanks for more carrying capacity.
Up to six monolithic strap-on solid rocket boosters can be added to increase
lift performance. Atlas could fly a maximum of only five.
“This booster is a significant improvement in performance, and truly is a
conquerer of Earth’s gravity well.”
The existing high-energy Centaur upper stage will fly on Vulcan in the
earliest years. A new, long-duration upper stage being developed to debut
later will allow the new rocket to surpass the capability of the Delta 4-
Heavy.
“We are going to take a giant leap forward in our upper stage, too. We are
going to move to an advanced cryogenic upper stage, burning liquid oxygen
and hydrogen,” Bruno said.
“The exciting part is the Integrated Vehicle Fluids system, the ultimate in
reuse. The thing that limits the performance of upper stage systems in
launch vehicles is time. Time in space. … We will use an advanced internal
combustion engine that will take those waste propellants and recycle them to
repressurize our tanks, to generate electrical power and to provide control
thrust and attitude thrust for this upper stage system.
“This completely changes everything. Not only do we collapse from three
subsystems to one, simplified systems and lower costs, what it really does
is a tremendous extension of our time on orbit. We are going to go from
hours to weeks with this system. That will open up a whole universe of
possibilities — we can carry multiple satellites into orbit, we can put
them into different planes, and when we get done with that we can fly back
to the space station for operations,” Bruno said.
ULA is building the engine with Roush, the NASCAR team. “This upper stage
really is a formula race car of space,” Bruno quipped. |
