Investigation of surge characteristics and surge eliminating system verification based on a certain engine

Ground test of surge inducing based on a certain engine was performed separately by installing disturbed board at inlet and increasing the fuel delivery.Characteristics of the test methods,the engine parameters in the process of test and the reason of surge were analyzed.The test results show that intermittently pushing staff slowly after installing disturbed board at inlet and pushing staff suddenly after increasing the fuel delivery are effective methods,which could reflect impact of influential factors on engine stability.By accelerating after installing disturbed board at inlet,the total pressure distortion and reduction of air flow result in engine surge,and fan surge occurs before the compressor;however,after increasing the fuel delivery,gas oil ratio is always bigger along with engine acceleration so that the stability margin of combustor is lower,and air provided for engine is jammed by high-pressure gas of combustor so that compressor and fan surge occur successively.Surge eliminating system reliably works and critical distortion of the engine is obtained.The studies in this paper have established a necessary basis for surge inducing test in the air and stability assessment.