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Old 10-28-2008   #1 (permalink)
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Standing waves in exhaust gases

Upon watching the following clip, I am left wondering how the hell those standing waves (see pic) are created in the exhaust and if they have some practical function..


J
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standing-waves-in-exhaust-gases-methanerocket.jpg  


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Old 10-28-2008   #2 (permalink)
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Re: Standing waves in exhaust gases

Quote:
Originally Posted by Jay-qu View Post
Upon watching the following clip, I am left wondering how the hell those standing waves (see pic) are created in the exhaust and if they have some practical function..

YouTube - Nasa Methane Rocket Test - Impressive

J
I'm not sure if this has any relation to the waves you are showing but In a two stroke engine the exhaust, called an expansion chamber, uses the shape of the chamber to guide sound waves to scavenge the cylinder on each stroke. These sound waves cause a partial vacuum at the exhaust port. Could this be a similar phenomenon caused by the shape of the exhaust chamber?


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Old 10-28-2008   #3 (permalink)
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Arrow Re: Standing waves in exhaust gases

Quote:
Originally Posted by Jay-qu View Post
Upon watching the following clip, I am left wondering how the hell those standing waves (see pic) are created in the exhaust and if they have some practical function..

J
Found this for you J. Exhaust Gases' Diamond Pattern - Level 3


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Old 10-28-2008   #4 (permalink)
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Re: Standing waves in exhaust gases

Thanks Turtle thats perfect


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