High speed video rocket mach diamond shock diamonds

[starguard]

Stolen German Technology

[yavan211]

why using liquid oxygen

[bbrockert]

@yavan211 It's the best oxidizer.

[fuckyorutube]

@bbrockert

Fluorine the best

[deeblueseaful]

I want to ask

What is it, like the crumbs that fall / peeling away from the pipe near the nozzle

crumbs are falling like dust and white smoke

thank

[bbrockert]

@deeblueseaful It's frost falling off a liquid oxygen line.

[0xanier0]

@bbrockert

condensation of water vapors and air its self.

[bbrockert]

@0xanier0 No, just water. It's pressurized LOX, so it's not cold enough to condense oxygen or nitrogen out of the air.

[styletoto]

A TYPICAL STRUCTURE OF CHOC WAVE

[Klause5425]

how big is this and what is the thrust produced?

[leodevil240mph]

can it run on whisky?

[chaosopher23]

@niclikescake Would you believe it that the fuel is used to cool the nozzle? Would you also believe that the fuel won't burn worth a damn without oxygen to make it burn? It works.

[Lordofdragons16]

I saw something like this with a jet engine.

[jeremiah1st]

@Lordofdragons16 You mean the Aurora project?

[Lordofdragons16]

@jeremiah1st

No, in person. It zipped past me at over 500mph, but i saw the diamonds anyway.

[yellowmetalcyborg]

What's the stuff falling off of the engine, is it frost? (cryogenic fuel)

[upajos]

The number of shock diamonds is approximately the Mach number. If you count six diamonds, the exhaust stream is traveling about six times the speed of sound.

[hybriddyneguy]

You the MAN Ben B !!!

[robfromorlando]

Is this an Atlas vernier thruster on a gimbal mount?

[bbrockert]

No, this is a 500lbf engine developed by Masten Space Systems. The Atlas vernier thrusters are usually run on kerosene and use some film cooling, which creates a much more luminous plume.

[rakrupski]

Couldn't the LR-101 run on alcohol-LOX?

[bbrockert]

Probably. The difference in volume would screw up the behavior of the injectors and cooling, you'd probably have to run the alcohol at a higher pressure than the LOX.

[bluestrayer]

actually shock diamonds (also called mach disks) are caused by the exhaust pressure being different from the ambient atmospheric pressure

[strgzr53]

ive heard the term shock daimonds numerous times but what exactly is it. or causes it.

[OnlyPerfect1]

the gasses coming out of the engine are going so fast that they break the sound barrier, which creates the shock diamonds

[rakrupski]

Exhaust flow beyond the engine throat expands and increases in velocity. Remember: Expand=Faster.

The exhaust plume leaves the nozzle and begins to slow down. Therefore, the flow begins to contract again. It continues to contract until it slows to Mach 1, then it begins to expand again. Each time the flow contracts to it's smallest diameter (at Mach 1), it becomes luminous because it's heat is occupying a smaller space and therefore it's temperature is higher. That's what mach diamonds are.

[rlewis1946]

Is it true that the number of visible shock diamonds relates in some way to the exhaust velocity?

Thanks for sharing this video.

RL Atlanta, GA USA

[bbrockert]

It seems to be a function of both the exhaust velocity and the engine shape and environment. Really big engines have a more cohesive plume, so the diamonds are visible longer.

They also move around as the chamber pressure changes, so a very steady engine will have more visible diamonds.

[chrislapanse]

Mach diamonds are pretty, but they have nothing to do with any quantum phenomena.

[part2themovie]

mach diamonds are so pretty, the quantum universe is so spectacular

[lithiumdeuteride]

The regular universe is also pretty spectacular.