Finding the buzzing frequencies at different inlet and throttling conditions for a hypersonic inlet

Hypersonic intake unsteadiness

[Multimedia View] Typical instantaneous contour plots of the Mach number observed at an arbitrary time step during the simulation of different throttling ratios. A steady flow field is observed up to 0 ≤ ζ ≤ 0.2 and an unsteady flow field is seen for 0.3 ≤ ζ ≤ 0.7. Key flow features: 1—shock from ramp-1, 2—shock from ramp-2, 3—shock from ramp-3, 4—shock-wave boundary layer interaction (SWBLI) on the cowl wall, 5—SWBLI on the ramp wall, 6—secondary SWBLI inside the isolator, 7—throttling plug induced shock, 8—choking induced by the throttling plug, 9—formation of unsteady pseudo shock/shock train, 10—increasing throttling plug height, and 11—the sinuous upstream motion of the pseudo shock/shock train. https://doi.org/10.1063/5.0032740.1 On the unsteady throttling dynamics and scaling analysis in a typical hypersonic inlet–isolator flow Physics of Fluids 32, 126104 (2020); https://doi.org/10.1063/5.0032740