Numerical simulation of the effect of wall roughness on isolator aerodynamic performance
In this paper,to study the effect of roughness on the performance of an isolator,numerical simulations of roughness sizes and roughness distribution effects on the development of shock train and airflow parameters at the i-solator exit were conducted under the same back pressure with an isolator inlet Mach number of 2.0,a total pres-sure of 0.82 MPa,and a total temperature of 840 K.The results showed that,compared with a smooth wall,when the overall roughness was arranged,the transition of the boundary layer was advanced,the initial position of the shock wave train moved upstream,and the airflow parameters at the outlet of the isolator decreased.When the roughness zone was arranged at 50S,with the increase in roughness,the initial position of the shock wave train moved backward.When the rough zone was arranged at 70S,with the increase in roughness,the recovery coeffi-cient of the total pressure at the outlet of the isolator increased with the increase in roughness.Therefore,reasona-ble placement of roughness location and size allows the isolator to have a better performance.
万方数据
维普
