Noise Reduction in Argon Driven Expansion Tubes
Analytical results are used to show that the presence of noise in the test flow of an expansion tube is dependent on the sound speed of the driver gas. If the flow enthalpy is fixed it is shown that lowering the sound speed of the driver makes the test flow quieter. It is also shown that it is more difficult to obtain quiet test flows at lower enthalpies. The analysis also predicts that a decrease in the driver gas sound speed may be required if the reduction in noise in large diameter expansion tubes is to be the same as that in small tubes.
Key wordsExpansion tube Noise reduction
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