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Space Shuttle Main Engine Test (Read 113 times)
Sonny
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Space Shuttle Main Engine Test
08/13/15 at 23:12:11
I love this kind of power. NASA tested an updated controller on one of the remaining RS-25 SSME's today at Stennis. Man, those things just go and go.
Video:
http://www.space.com/30254-nasa-tests-new-brain-for-old-rs-25-rocket-engine-v...
Digger could confirm this, but I don't think the Space Shuttle ever had a main engine failure. Amazing when you consider the forces and pressures involved.
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Dave
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Re: Space Shuttle Main Engine Test
Reply #1 -
08/14/15 at 03:42:45
Pretty cool.......
Does the EPA make them use that crappy E10 fuel?
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Sonny
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Re: Space Shuttle Main Engine Test
Reply #2 -
08/14/15 at 04:04:51
Dave wrote
on 08/14/15 at 03:42:45:
Pretty cool.......
Does the EPA make them use that crappy E10 fuel?
No way, daddy-o, that's liquid hydrogen and LOX burning there... nothing coming out of that nozzle but heat and water vapor. And for all the cleanliness of the fuel, incredible energy density. The only drawback is, it's expensive to produce and hard to handle. Otherwise, we'd be running our scooters on it...
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Dave
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Re: Space Shuttle Main Engine Test
Reply #3 -
08/14/15 at 04:49:48
Yea....I know the shuttle is LOX and Hydrogen - I just hated to miss an opportunity to take a shot a the EPA and their ethanol mandate.
Looking at the vapor trail from that engine, it is obvious the end result of the combustion process is just water vapor.....and there is no need for an EPA mandated catalytic converter (another shot a the EPA).
I wonder how far from the nozzle the exhaust temperature drops below scorching hot? With water vapor being the only exhaust product....it would seem the exhaust would cool pretty quickly.
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verslagen1
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Re: Space Shuttle Main Engine Test
Reply #4 -
08/14/15 at 07:40:26
Pretty sure they're burning hydrazine.
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LANCER
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Re: Space Shuttle Main Engine Test
Reply #5 -
08/14/15 at 08:23:32
Do you think I could stuff this into my '96 Savage frame ? ?
Light up my life baby !!!!
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Dave
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Re: Space Shuttle Main Engine Test
Reply #6 -
08/14/15 at 08:44:35
verslagen1 wrote
on 08/14/15 at 07:40:26:
Pretty sure they're burning hydrazine.
Is that liquid Hydrogen with 10% ethanol added so that NASA is "green"?
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verslagen1
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Re: Space Shuttle Main Engine Test
Reply #7 -
08/14/15 at 09:18:59
Dave wrote
on 08/14/15 at 08:44:35:
verslagen1 wrote
on 08/14/15 at 07:40:26:
Pretty sure they're burning hydrazine.
Is that liquid Hydrogen with 10% ethanol added so that NASA is "green"?
WWII rocket fuel, definitely not green.
LH would be green, but not as powerful.
I wonder if there's a LENR fuel.
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verslagen1
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Re: Space Shuttle Main Engine Test
Reply #8 -
08/14/15 at 09:20:54
LANCER wrote
on 08/14/15 at 08:23:32:
Do you think I could stuff this into my '96 Savage frame ? ?
Light up my life baby !!!!
There's been a couple of pulse jets strapped to bicycles.
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Kris01
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Re: Space Shuttle Main Engine Test
Reply #9 -
08/14/15 at 10:51:23
I've often wondered how these things don't end up as a puddle on the floor. The heat must be intense!
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verslagen1
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Re: Space Shuttle Main Engine Test
Reply #10 -
08/14/15 at 11:49:54
Kris01 wrote
on 08/14/15 at 10:51:23:
I've often wondered how these things don't end up as a puddle on the floor. The heat must be intense!
They spray a lot of water into the flame trail.
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Sonny
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Re: Space Shuttle Main Engine Test
Reply #11 -
08/14/15 at 11:57:51
I've often wondered how these things don't end up as a puddle on the floor. The heat must be intense!
The nozzle is cooled by letting some pressure off the liquid oxygen, which has already been supercooled to get it into a dense liquid state, and circulating it through tubing wrapped around the nozzle before it goes to the combustion chamber, cooling it, same as the way your AC works -- Bernoulli's Principle. Compression makes heat, reducing pressure cools. You can see the tubing there on the outside of the nozzle. The system is designed so the rate of cooling is ferocious.
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Kris01
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Re: Space Shuttle Main Engine Test
Reply #12 -
08/14/15 at 12:26:12
One small LOX leak and the whole thing becomes a Roman candle!
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Sonny
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Re: Space Shuttle Main Engine Test
Reply #13 -
08/14/15 at 12:31:20
verslagen1 wrote
on 08/14/15 at 07:40:26:
Pretty sure they're burning hydrazine.
No, Vers, hydrazine is a monopropellant (doesn't require mixing w/ a separate oxidizer) used in thrusters and also was used to run the APUs on the Shuttle. It is nasty, toxic stuff.
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dontwannapickle
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Re: Space Shuttle Main Engine Test
Reply #14 -
08/16/15 at 08:13:43
Yep, SSME fuel is hydrogen and oxygen. In addition to providing ground support acquiring data for every Shuttle flight since the second one, I was fortunate to be able to digitize the flight data from the Shuttle's on-board recorder for the whole time the Shuttle flew. One of the things my customers were concerned about was the health of the turbo-pumps that supplied the fuel to the engines in order to decide if the engines were suitable for reflight or needed rebuilding. There are vibration sensors around the perimeter of the pumps and if there was a noise spike in the sound spectrum they could tell which bearing was going bad by the frequency of the noise. (Sorta like how some of y'all can tell the state of your cam-chain tensioner by feeling the vibes coming from the engine cover with your heel.)
I recall that there were a couple times that an engine was shutdown early, but it happened late enough in the powered portion of the flight that the Shuttle was able to still make it to orbit with the remaining engines. Of course, there were many times the engines failed or indicated failure and thus launches were aborted due to engine problems. There were never any catastrophic SSME failures, though.
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