Discharge of a costant volume chamber
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Hi all,
I'm modelling the discharge of a pressurized constant volume chamber at a specific temperature in the pneumatic domain. Here you can see the model:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153388/image.jpeg)
The model works fine in charging, but not in discharging; the same the flow rate in charging is much higher than in discharging with the same valve area and pressure difference. Here you can see the pressure trend in discharging top and in charging bottom with the same pressure difference:
Charging:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153389/image.jpeg)
Discharging:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/153390/image.jpeg)
As you can see in charging the max flow rate is around 2e-3 kg/s instead in discarghing is around -7e-6 kg/s (the pressure difference is the opposite than in the charging simulation) even if the valve area and pressure difference is the same. Should them be the same?
I'm attaching the model.
Any suggestion is appreciated.
Thanks
Thanks
2 comentarios
dpb
el 30 de Nov. de 2013
I don't have Simulink and my eyes can't read the graphics but just a question that comes to mind...is the driving pressure really the same in discharge as in charge? It strikes me that there may be an external "push" that's there from the air source that isn't when discharging so that what you think is the same dP really isn't (except instantaneously at the initiation of discharge, perhaps).
I don't know that has anything whatever to do with the problem; just a thought reading the problem description...
Respuestas (1)
pietro
el 5 de Dic. de 2013
1 comentario
Abhishek Vats
el 28 de Oct. de 2020
Hi , i download this circuit but its not working can you help me to understand this and share the correct circuit @abhishekvats_rajbir@srmuniv.edu.in sir.
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