A RANS/ILES study of the features of the flow in the spatial air intake of a supersonic business-class aircraft in throttle modes

Using the combined high-resolution Reynolds Averaged Navier–Stokes (RANS) and Implicit Large Eddy Simulation (ILES) method, the flow in the spatial air intake of a business-class aircraft with the calculated Mach number $\rm M = 1.82$ is studied. Two variants of the air intake geometry are considered: isolated and with a glider simulator. The calculations are carried out at different degrees of flow throttling. For an isolated air intake, calculations are performed for two variants of the boundary layer drain system. To improve the characteristics of the air intake with a glider simulator, in addition to the drain system, it was equipped with air bypass windows on the side “cheeks.” In the course of calculations, the throttling characteristics for both variants of the air intake, as well as the dependence of the level of pressure pulsations and longitudinal velocity in the nozzle of the air intake on the degree of throttling, are obtained. It is found that the presence of a glider simulator has a strong effect on the flow in the air intake. The calculation data are compared with the available experimental data for an air intake with a glider simulator at $\rm M_{\infty} = 2$.