Abstract
In the miniaturization of wave rotors, one of the important points in its design is how to decide the passage length. Longer passage allows slower rotor speed, while it will yield larger wall friction effect. In the present study, shock wave propagation process in narrow tubes was carefully observed and discussed experimentally and numerically. Shock wave visualization, velocity measurement and stagnation pressure measurements were carried out with two test sections of different lengths in this experiment. In the visualization, the whole propagation process of shock waves was observed clearly in both test sections, so that it was confirmed that the dissipation effect of shock waves or the interaction between shock waves and boundary layer apparently are not dominant. It was also confirmed by Laser Doppler Anemometry measurement that the flow velocity induced by the shock wave traveling shows a good agreement with numerical results.
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