关键词: 涡轮喷气发动机;高空模拟试车台;模拟试验;流场畸变

Abstract: The effect of inlet flow field distortion on the stability of a twin-spool turbojet and the surge-trouble shooting of a twin-spool turbojet engine tested at a high altitude test facility are discussed in this paper.A FFT signal processor is provided for the signal analysis and diagnosis of surge in a twin-spool turbojet engine test. The experimental investigation of surge under a turbulent dynamic inlet distortion condition was performed with the emphasis on the cause analysing and the surgetrouble shooting in a turbojet engine test at a high altitude test facility .From the FFT analysis some conclusions can be drawn. Most of surge in a turbojet compressor under turbulent dynamic inlet distortion conditions is "drift-mode" surge which appears at random.The turbojet is far more sensitive to dynamic inlet distortion than to steady inlet distortion.A unique structure of aerodynamic-gird and converging section for flow stabilization is most effective for improving the inlet flow field in a test facility.

Key words: Turbojet engine;Altitude simulated test cell;Simulated test;Flow distortion