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In Reply to: RE: Is owning a 3D printer worthwhile posted by Leo loves music on May 10, 2025 at 05:37:59
Edits: 05/16/25Follow Ups:
Probably take a long time to print.
Printing the engine might be tricky, too -- come to think of it.
And then there would be the munitions...
all the best,
mrh
without a pilot it would be completely useless.
"Once this was all Black Plasma and Imagination" -Michael McClure
I am very interested in jet engine. When I visited DC, I stayed in the museum for a very long time and tried to figure out how a jet engine works. I couldn't figure out why it only pushes backward but not pushes forward.When I was very young, I made a jet engine using alcohol. But it exploded.
Edits: 05/12/25
I always thought they were interesting too,
I wondered the same thing, it kind of bothered me.
The answer was interesting i thought as it has to do with viscosity of the hot gas being much "thinner" and so, able to escape at a much higher speed.
In fact the exhaust can be "supersonic" because the speed of sound goes up with temperature also (i think it was about 230C where the speed has doubled) and this is how a jet can be supersonic too, the air getting out of it's way is compressed and hot and can then flow around the nose and wing edges at supersonic speed. Fwiw the visible cone you see going supersonic is the negative pressure wave, the positive pressure wave is first and is invisible and does not condense water vapor because it's hot.
The force out the back is a product of the mass flow and velocity but it's the velocity raised to something power, maybe squared or cubed don't remember, would have to google it.
Anyway, the same weight of air going in comes out much faster because its hot and so pushes, what a nice warm fire and happy noise.
Intake and Compression: The engine sucks in air at the front and compresses it. This requires energy input from the engine's turbines.
Combustion: Fuel is mixed with the compressed air and ignited in a combustion chamber. This process significantly increases the temperature and pressure of the gases.
Expansion and Exhaust: These hot, high-pressure gases then expand rapidly. The engine is designed with a narrower opening at the rear (the nozzle) compared to the front intake. This constriction forces the expanding gases to accelerate dramatically out the back.
Think of it like squeezing a balloon - the air rushes out the opening you create. In the jet engine, the nozzle acts as that opening.
Why not the front?
While there might not be a physical barrier blocking the front in a static museum display, the entire design of the engine is engineered to direct the flow rearward:
Turbine Blades: Behind the combustion chamber are turbine blades. These are specifically shaped to extract energy from the rapidly expanding gases, causing the turbines (and the compressor at the front) to spin. The angle and curvature of these blades are crucial for directing the airflow towards the rear.
Converging Nozzle: The narrowing shape of the rear nozzle is key to accelerating the exhaust gases. This acceleration is what generates thrust in the opposite direction, propelling the aircraft forward. If the gases were to exit freely from the front, this acceleration and the resulting thrust would be significantly reduced or non-existent.
So, while it might appear open at both ends in a non-operational engine, the internal components and the overall aerodynamic design are what dictate the direction of the powerful exhaust flow. The engine is meticulously designed to harness the energy of the combustion process and direct it rearward to create thrust.
Good description!
My point was the unexpected effect the heat has on the gas viscosity.
It is the viscosity that is tied to air sound velocity, if you had a box with a hole in it and the inside had 1 atmosphere over ambient, putting a hole in the box, the max air speed out of the hole is the speed of sound.
If the air were heated to around 230C, the speed of sound has already doubled and so is the velocity of the air exiting the hole at a give presure.
BUT the kinetic reaction from that is like with a bullet where the energy it carries is what 4 times greater if traveling twice the speed and like felt recoil, the plane is pushed by that..
Might be fun someday, google "turbo charged burn barrel"
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