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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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