Normal shock relations

shock77 · April 16, 2021, 10:00

Hello,

I am currently trying to solve the normal shock relations for two species. I have basically a shock tunnel, where a moving shock propagetes from a high pressurized helium chamber into a air chamber with ambient pressure and temperature.

Therefore before the moving shock there is air with y=1,4 and R = 287 and behind the shock there is helium with y=1.67 and R = 2077.

My questions are:

1. Is there any literature where this problem has already been solved? Unfortunately I couldn't find any.

2. Is the assumption correct, that behind the shock there is pure helium or is there some sort of mixing? I would say it is pure helium, since the pressure behind the shock is higher than ambient pressure, so backflow is not possible. Just want to make sure I am not missing an important aspect.

Thanks in advance!

hunt_mat · June 22, 2023, 05:36

Are you after the simple solution if the shock relations? Aren't these found in every look on gas dynamics?

April 16, 2021, 10:00	Normal shock relations	#1
shock77 Senior Member Join Date: Dec 2019 Posts: 215 Rep Power: 7	Hello, I am currently trying to solve the normal shock relations for two species. I have basically a shock tunnel, where a moving shock propagetes from a high pressurized helium chamber into a air chamber with ambient pressure and temperature. Therefore before the moving shock there is air with y=1,4 and R = 287 and behind the shock there is helium with y=1.67 and R = 2077. My questions are: 1. Is there any literature where this problem has already been solved? Unfortunately I couldn't find any. 2. Is the assumption correct, that behind the shock there is pure helium or is there some sort of mixing? I would say it is pure helium, since the pressure behind the shock is higher than ambient pressure, so backflow is not possible. Just want to make sure I am not missing an important aspect. Thanks in advance!

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June 22, 2023, 05:36		#2
hunt_mat Senior Member Matthew Join Date: Mar 2022 Location: United Kingdom Posts: 175 Rep Power: 4	Are you after the simple solution if the shock relations? Aren't these found in every look on gas dynamics?