Effect of insert plate on the inlet pressure distortion of the aero-engine

Abstract

The shape of the inlet duct and other factors cause distortion of the total pressure, leading to a decrease in engine stability. This article inserts flat plate into the inlet port of a certain type of aviation turbojet engine to conduct an inlet distortion test on the entire engine. The characteristics of entire flow field after inserting the board are obtained through experiments and numerical simulations, and it is concluded that the depth of the board is positively correlated with the reflux area and total pressure loss. The area of the insertion plate increase leads to an increase in the distortion index, and a decrease in engine flow rate. Meanwhile, angle plate device is designed to simulate inlet distortion caused by elevation takeoff. Summarize the relationship between the depth of the insertion plate and the intake distortion, a comprehensive distortion index simulation formula is fitted. The distortion simulation device designed by combining prediction formulas can achieve continuous adjustment of comprehensive distortion index 2%–13%, meeting the distortion index requirements for aircraft engine anti distortion testing. This device can replace complex intake systems to save test costs and cycles, and quickly and effectively carry out aircraft engine related distortion testing.