Simulation by the RANS/ILES(I) method of subsonic air intake operation in an incoming flow with large scale vortices

A. S. Zhigalkin, D. A. Lyubimov

Central Institute of Aviation Motors

Abstract: The influence of large scale vortices (LSV) in the incoming flow on the flow and characteris tics of a model subsonic air intake (AI) has been studied using the modified RANS/ILES(i) method with a reduced level of numerical viscosity. For comparison, calculations were performed with an undisturbed external flow. The parameters of the external flow correspond to the takeoff mode and are performed at an angle of attack of 5$^\circ$. The influence of LSV the incoming flow on the instantaneous and averaged flow and turbulence parameters inside an air intake channel and in its outlet section is revealed. It is established that the presence of LSV has a weak effect on the average flow parameters of AI outlet section, but leads to a significant increase in the pulsations of the total pressure in this section.

Keywords: RANS/ILES(i) method, reduced numerical viscosity, subsonic air intake, in coming flow with large scale vortices, stagnation pressure pulsations.

Received: 08.04.2025
Revised: 24.04.2025
Accepted: 13.05.2025

DOI: 10.20948/mm-2025-05-01