Experimental research on a novel dynamic composite distortion simulator

Abstract

Large-scale dynamic distortion vortexes are generated in advanced complex inlet systems, which can cause serious dynamic distortion flows and influence the performance of engines. Thus, this paper proposes a novel dynamic distortion simulator design method, which uses a column to produce a large-scale streamwise vortex and a rotating valve to enhance the dynamic characteristics, to simulate the complex distortion flow field. Experimental studies were conducted in this paper. The results show that circumferential total pressure and swirl distortion were generated regardless of the valve position. The range of the distortion region decreased significantly when the valve changed from fully closed to fully opened. When the valve rotated continuously, the dynamic total pressure and swirl distortion were generated behind the simulator. At the section, three diameters away from the simulator, the comprehensive distortion index was 7.69%, and the turbulence intensity was 46.4%. The main frequency of the distortion flow field was the same as the switching frequency of the inner channel in the column.