Analysis of the Flow Perturbations in a Shock Tube Due to the Curvature of the Diaphragm
When using cellophane diaphragms in shock tubes, one can experimentally observe some perturbations superposed to the pressure plateau following the incident and reflected shock. With the help of numerical simulation, based on the solution of the Euler equations, we show that these perturbations are periodic and due to the curvature of the diaphragm separating the high and low pressure chambers. We analyse the development of the waves originating the phenomenon, and we compare the numerical and experimental results which are in excellent agreement.
Key wordsShock tube Pressure fluctuations Numerical simulation
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