Adjusting the Ratio of Steady and Dynamic Components of Total Pressure Distortion Using the Combination of Annular Plate and Cylindrical Rod

Abstract

The aero-engine always suffers from the inlet distortion because of intake flow separation and wing wake during the aircraft flight. Total pressure distortion, which has negative impact on the stability of the compressor, is a typical form of inlet distortion. The test and analysis of the compressor stability under the inlet total pressure distortion is an important segment in aero-engine design. The inlet total pressure distortion consists of steady and dynamic components, and the ratio of steady and dynamic components will change with the variance of working conditions. However, the traditional distortion generator can only generate the inlet total pressure distortion with fixed steady/dynamic ratio (SDR), and this makes it difficult to test the performance of aero-engines under different types of inlet total pressure distortions. To solve this problem, a new-type total pressure distortion generator based on the combination of cylindrical rod/annular plate and baffle plate is designed in this paper. Through adjusting the characteristic parameters of the rod/plate, the SDR of total pressure distortion can be varied actively. The wind tunnel test results show that increasing the number of the cylindrical rods, the circumferential scale of the annular plate and the height of the rods/plates can reduce the SDR.