S-shaped Inlet Flow Characteristics Test Rig Design and Experimental Research

Abstract

Abstract. An inlet flow characteristics test bench was designed for the high offset s-shaped inlet. Parametric design method was used in the design of direct-connect contraction. Numerical simulation results showed export velocity of the designed contraction distributed uniformly, the boundary layer was thin, which had good air contraction effect. Steady state flow characteristics test of the s-shaped inlet was carried out on the inlet test bench, and effectively verified the performance indicators of it. Test results showed that an obvious low pressure area existed on the bottom wall after the first corner of the s-shaped inlet. With the increase of inlet Mach number, the exit flow field quality deteriorated. When the inlet Mach number was 0.72, the export distortion index DC 60 was over 17%, which could not meet the needs of normal work of the engine.