Abstract:

To seek an effective flow control method to improve the flow rate captured by the inlet， this paper explores the effect of different laser excitation forms （including single laser pulse， continuous laser pulse， high repetition frequency laser pulse） on the dual inlet based on the unsteady Reynolds-averaged Navier-Stokes equations. The control process and the influence of the flow field parameters are studied. In the upstream of the GK-01 dual inlet with Mach number of 7， laser energy deposition is added， and the excitation flow field and the basic flow field are compared. The results show that the energy deposition acts on the flow field structure in the inlet mainly through the high temperature heat core and its induced pressure waves， reducing the separation area in the inlet， increasing the mass flow， and improving the flow state in the inlet. The specific control process includes two aspects. First， the pressure wave induced by the energy deposition interacts with the oblique shock wave. The local high temperature and high pressure of the energy deposition causes deflection of the inlet airflow， and part of the airflow that originally flows out of the inlet is affected by the pressure and flows into the inlet， thus increasing the mass flow rate of the inlet. Second， the energy deposition and pressure waves propagate to the flow field area in the inlet， and the pressure waves generated by the energy deposition interacts with the separation area of the inlet， leading to the gradual decrease of the low-energy separation zone and the increase of the inlet mass flow.

Key words: flow control, energy deposition, inlet, captured flow rate, separation