straighttoplaid t1_irpgao3 wrote
Reply to comment by zutonofgoth in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot
Modern engines can run pretty high compression ratios. The GE9X is advertised as having a 61:1 overall pressure ratio. I don't think you're going to see ~900 psi in a bike tire.
zutonofgoth t1_irpquv6 wrote
The compression ratio is the difference between the static air pressure at the front of the engine and the dynamic pressure at the rear of the engine. The dynamic pressure includes velocity in the calculation. It's not really comparing apples with apples. So you can not just multiply the values out.
900psi is more like rocket engines?
julie78787 t1_irqujss wrote
A lot of rocket engines have maximum pressures in the combustion chamber of 200-300 bar, so 3,000 to 4,500 PSI.
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