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Pulsejet engine turbulence model Answered

Hello everyone i have conducted several pulsejet engine tests but today i tried to simulate a pulseejet engine in Ansys fluent 14.0 and here it is. This is a K-e model. The peak pressure at the instant of combustion was 2.5atm. The maximum velocity reached is about 800m/s and the peak temp was about 3000K.

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steveastrouk (author)2013-08-11

How come there's no effect from hitting the right hand wall ?

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ganuganu (author)steveastrouk2013-08-11

On the right hand side its outlet not wall..

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kelseymh (author)2013-08-05

These look like single-shot pulses, correct? Are the density and temperature profiles independent? From the look of the simulations, and taking an impulse approximation, it seems like they're highly correlated, and hence somewhat redundant.

Do you get a local velocity (or even just speed) map out of the simulation? That could be interesting as it should "lead" the pulse propagation we see in the other two animations.

The nearly elastic "rebound" of both pressure and density up and down the tube, after the pulse is complete, is very interesting to see. In a physical pulse jet, is the repetition rate meant to be faster or slower than that rebound? That is, does a real pulse-jet have time to relax back to equilibrium between shots?

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ganuganu (author)kelseymh2013-08-05

I have mentioned the corresponding velocity in the description. And when you see the simulation it looks like it is slow but in reality this process can be seen very fast. Here i have used small timesteps thats why it looks slow here. And yes this is a single cycle simulation.

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