Valveless pulsejet-computational fluid dynamics

Moderator: Mike Everman

Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Wed Mar 01, 2017 3:21 pm

Hello everyone its been a long time, How are you all??? Hope everybody is fine.

I would like to share some CFD simulated pulsejet engines which are quite interesting to understand the underlying physics. I will share some plot images and videos here for your reference.

Currently I am using CFD to develop new valveless pulsejet design,

https://youtu.be/pwA2IQGRzYc
Attachments
velocity.png
temp.png
pre.png
ganuganu
 
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Re: Valveless pulsejet-computational fluid dynamics

Postby Mike Everman » Tue Mar 21, 2017 7:29 am

Hey Ganesh, I too have not been around much, but think i should. Hope all is well with you too. Looks like fun.
You might try low pressure ambient at the tail if your start condition is high at the intake. All these years, and the one thing i still want to show on a running motor is the alternating nature of intake and exhaust pulses.
We'd always look at the sound file and say "wow, the second mode is REALLY STRONG!" I think i can see it in this video.
Mike
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Re: Valveless pulsejet-computational fluid dynamics

Postby ganuganu » Tue Mar 21, 2017 6:14 pm

Mike Everman wrote:Hey Ganesh, I too have not been around much, but think i should. Hope all is well with you too. Looks like fun.
You might try low pressure ambient at the tail if your start condition is high at the intake. All these years, and the one thing i still want to show on a running motor is the alternating nature of intake and exhaust pulses.
We'd always look at the sound file and say "wow, the second mode is REALLY STRONG!" I think i can see it in this video.


Yes I am good and everything is smooth now. Hope everything is fine from your side.

Low pressure at outlet seems good initial condition, I will surely try it in my next simulation. The original initial condition that i gave is velocity of 10m/s all over the domain. The reason to give this was to mimic the blower air velocity inside pulsejet which we usually do in real time.

Now I am actually trying to perform Aero-acoustic analysis to visualize the pressure pulses inside and outside PJ. I thought this might give us an idea of the sound frequency at outlet. One important update, some people told me that we can even export the simulated pressure pulses to audio format and hear it live :D . Really excited to move on to acoustic analysis. Once it is done I will surely update it here in forum.

Thanks for following my post.

Regards
Ganesh
ganuganu
 
Posts: 325
Joined: Tue Dec 14, 2010 7:31 am
Location: india


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