Valveless pulsejet-computational fluid dynamics

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ganuganu
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Re: Valveless pulsejet-computational fluid dynamics

Post by ganuganu » Tue Dec 19, 2017 1:54 pm

Hi Zono'

Thank you very much.

I am beginner in OpenFOAM, have just done flow past cylinder case :D :D . It will be very interesting to see these kind of simulations in OpenFOAM, eagerly waiting for your results. All the best.

Regards
Ganesh

zono
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Re: Valveless pulsejet-computational fluid dynamics

Post by zono » Mon Jan 01, 2018 9:57 pm

Dear Ganesh,

first I wish a happy New Year to all forum users!

Hopefully I will have a little more time next days to seek for my old simulation results images and animations done by Comsol Multiphysics

so long !

zono
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Comsol Multiphysics: Valveless pulsejet-computational fluid dynamics

Post by zono » Fri Jan 05, 2018 5:42 pm

hi all,

here are two examples of my linear-acoustics Simulations (CFD for poor) elaborated with Comsol Multiphysics 4.3 : ...

afwe-eigenfrequency-helmholtz4-harmonic-pipe-end_corrected-1 :
acoustic eigenmodes of a so-called "harmonic-design" (I will report on this theory in the next weeks / months)

K-PT07X-eigenfreq :
acoustic eigenmodes of a K-PT07X (full-functional valveless designed by Marten Klein, a senior-member of this forum)

K-PT07X :
same K-PT07X engine, time-dependent Simulation of acoustic linear wave equation (en.wikipedia.org/wiki/Wave_equation)

so far,
harmonic-thumb.png
zono
Attachments
K-PT07X.gif
K-PT07X-eigenfreq.gif
afwe-eigenfrequency-helmholtz4-harmonic-pipe-end_corrected-1.gif
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Re: Valveless pulsejet-computational fluid dynamics

Post by Mike Everman » Wed Jun 20, 2018 8:09 pm

Loving that first animation, Zono. Wish it went longer to see the pressure peak happen again in the CC. Love the way it shows the rarefaction waves colliding in the tail, where it would love to collapse if we use too thin a material!
Mike
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Re: Valveless pulsejet-computational fluid dynamics

Post by Mike Everman » Fri Sep 07, 2018 11:57 pm

Hi Zono and Ganesh,
I'd like very much to know if this motor's intake and exhaust alternate. I'm about to put it to a turbine and in or out of phase is important. Any interest in running this geometry? I'm imagining test rigs to find out, but thought you guys would enjoy the idea.
pocket jet, 3.5 lb thrust, all dimensions internal.PNG
Dimensions are in inches. It goes with my thought that long expansive tails have in phase inlet and exhaust, and this shorter solution alternates, and it must be one or the other.

Thanks much, Mike
Mike
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Re: Valveless pulsejet-computational fluid dynamics

Post by ganuganu » Sun Sep 09, 2018 4:16 am

Hi Mike

That's interesting. If you could share me the geometry file,it will be easy for me to proceed with simulation.

I would require the following details from your side:
1. Fuel type
2. Injector location and size
3. CAD file in x_t,x_b,step or iges format

Thank you

Regards
Ganesh

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Re: Valveless pulsejet-computational fluid dynamics

Post by Mike Everman » Mon Sep 10, 2018 2:02 pm

Hi Ganesh, fuel is propane and i will post a pic of the fueling.
My motors are bent into a “u”. Do you need a straight or can you do the bent version?
Mike
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Re: Valveless pulsejet-computational fluid dynamics

Post by ganuganu » Mon Sep 10, 2018 3:01 pm

Straight or bent design anything is ok for me.

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