Cryogenic Rocket Engine Forms Icicles

[yung23567]

nvrmnd..

"which means it has the flexibility to reduce thrust from 100 percent down to 10 percent allowing a spacecraft to gently land on the lunar surface. The 13,800-pound thrust engine uses extremely cold liquid oxygen and liquid hydrogen as propellants.

"

[yung23567]

how much thrust is generated ?

[KeyFra2011]

Where is this at?? Is this in some kind of space ship of something??

[CrustyBumHol]

its just water

[TCreatorO]

they should make a bunch of these to cool down the north pole. lol

[Mendelevium146]

This is like exhaust without ignition?

[GelandnaleG]

1:13

hundredpercentpower

Icarparkedonlagrange

hundredpercentpower

1:13

[mightyfinejonboy]

are they caused by a slightly over-expanded nozzle?it is converting the high pressure in the combustion chamber to high velocity which creates a large temperature drop.

[creedrulz6000]

@mightyfinejonboy it's caused by the fuel

[highvoltagefeathers]

Its the venturi effect I think, expanding gas takes heat with it. The rocket actually runs at very low temperatures, its the exhaust a couple feet downstream that gets hot. They likely inject a cool gas like helium around the inside of the bell to keet hot gas and metal away from eachother.

[DrMotorDude]

@cinder5832 That was from pressure oscillations called, "chugging." It makes a kind of vibration and shake at low throttle.

[mtvprankes]

looks week is anything even happing ?

[Eqvaliser]

Hydrogen = lovely, the way to go.

howewer a tad more explosive than gas,

so hard to store for a "normal" consumer.

say like in a car gas tank, or forklift.

but not impossible.

[vblogrsRLzrs]

Hydrogen rocket engine. Burn hydrogen and oxygen, what do you get? H20, water. The blue exhaust is steam, steam at about ~6000 degrees. The icecles form because all that liquid hydrogen is pumped through the nozzle to stop it from melting. its so effective that the edge stays cold enough to form ice.

[oomblikkies]

@vblogrsRLzrs They do the same thing on the shuttles for the same reason, but icicles do not form. Why the difference?

[Theonewhoclimbs28]

@vblogrsRLzrs I wonder why H2 + O2 seems to be the go-to fuel for space rockets. Isn't it extremely inconvenient to have to contain cryogenic fluids? Isn't the energy density pretty low for hydrogen? Couldn't they get more thrust per gram of fuel if they went with something with a higher energy density?

[Nadirion1]

@Theonewhoclimbs28 In multistage rockets it is very beneficial to have very light upper stage with LH2 and LOX. First stages are better with LOX-Kerosene exactly because energy density and tanks don't have to be huge.

[PhysicsManual]

@Theonewhoclimbs28 actually, hydrogen has the highes energy density for any chemical reaction (thats why water is so stable). The only problem is storage, which is why we dont use it in cars. If you want more power you need to go nuclear (i.e. the orion project) ;)

[Theonewhoclimbs28]

@PhysicsManual Ok, you know what'd be helpful is if I knew the is if I knew the formula for energy density so I could do it myself. I'll have to look it up. It's the only way I'll ever learn.

[PhysicsManual]

@Theonewhoclimbs28 I dont think there is a formula for it... As far as i know its just the maximum energy released when burning one kilogram of the substance (or for nuclear reactions, the amount of energy released when all the atoms of a kilo undergo nuclear reaction). So yeh, ur gonna have to look it up... its a pain :P

[philkarn]

This engine, like many others, probably runs fuel (hydrogen) through channels in its nozzle before it reaches the combustion chamber. That cools and protects the nozzle and helps vaporize the fuel.

[silver760]

Very expensive popsicle maker,does it do flavours aswell?

[MonoAoV]

i wanna play! can i push a button?

[ThorsDecree]

The steam the engine produces is extremely hot, but the supercooled engine components cool the steam. The steam then condenses on the nozzle in the form of water ice.

[shadynebey]

I think it's probably because it's hydrogen fueled - when hydrogen and oxygen combust they form water. Yes, it would be very hot though...so I'm not exactly sure what the deal is, extreme cooling of the nozzle maybe?

[ccederlo]

very curious..!

[roidroid]

how do icicles form on a running rocket - isn't it hot?

[Heartly07]

does the name Cryogenic strike you. chances are that it operates close to absolute 0

[roidroid]

i'll rephrase:

How does it work?

What is the chemical reaction?

What temperature is the rocket exhaust at the end of the nozzle?

What temperature is the end of the nozzle itself?

Is this merely a normal liquid-fuel rocket with incredibly effective regenerative cooling circulating in the nozzle?

Is that unburnt fuel flowing out from the nozzle?

Is it supposed to do that?

What is the source of the blue light?

Are those frozen icicles remaining even when the rocket throttles up to 100%?

[insanity54]

Does this mean that the next lunar lander game will feature a lander with a deep throttling engine?

[Shock1224]

roidroid, Basically the same as any other liquid fuel rocket. Hydrogen and oxygen. Extremely hot. Extremely cold. A couple differences. The fuel is injected in the chamber as a liquid instead of gas. No. It's water. Yes. The combustion. No, They melt. Close. The fuel itself is injected Is that unburnt fuel flowing out from the nozzle? Is it supposed to do that? What is the source of the blue light? Are those frozen icicles remaining even when the rocket throttles up to 100%?

[rucorvette]

shock1224, who are you talking to?

[atvrider312]

cool

[kdc43]

Cool???

COLD! Ice cold!

[TCmoru]

Absolutely amazing

[AuroraAbstract]

Nicicles!