The present paper is a study of the transient behavior of shock train in a constant area isolator. The traditional schlieren and the nano-tracer planar laser scattering(NPLS) techniques were performed to study the structure of the shock train and its temporal evolution. Results show that compared with the traditional schlieren, fine flow structures as the shock train, turbulent boundary layer, separation can be clearly revealed by NPLS. The complex spanwise structures did not synchronize with the streamwise structures due to the large aspect ratio of the isolator. High frequency pressure measurements were conducted to reveal the shock train movement and its frequency-domain feature. The shock train location and its movements were well detected by the integral of the pressure derivative.
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