24 March 2022 2 1K Report

Hello,

let us assume I have a combustion chamber and a convergent divergent nozzle.

For a given throat diameter my nozzle is going to be choked for Mach=1. In order to increase the mass flow rate further I need to increase the temperature (in order to increase the speed of sound).

My question is, what is thermal choking / rayleigh flow within this context? Does this mean that I can not put in more fuel into my combustion chamber to further increase the temperature and this way increase the speed of sound?

So one thing is that my nozzle is choked for Mach=1. But what is the relation to a rayleigh flow?

At least, I know the rayleigh curves: a subsonic flow can be accelerated by heating until Mach=1. But with further heating I should be able to increase the speed of sound (sqrt(kappa*R*T) ) and thus my mass flow rate, right?

Thank you for your feedback

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