Transient behavior of shock train with and without controlling

The present paper is a study of the transient behavior of shock train in a constant area isolator with and without controlling method. Two kinds of vortex generators were installed and tested. Planar laser scattering technique was performed to study the three dimensional structure of the shock train and its temporal evolution. High frequency pressure measurements were conducted to reveal the shock train movement and its frequency-domain feature. Three states of the shock train during its formation and movement were revealed based on the wavelet decomposition. The shock train location and its movements were detected by method of integral of pressure derivative and wavelet decomposition. And based on the comparison of the flow structures, shock train movements and the pressure recovery effect, a recommendation of applying passive control method for the isolator was proposed.