压气机试验效率修正的工程方法

Engineering approach of compressor test efficiency correction

效率是评价航空发动机压气机性能的重要指标,通常由试验直接获得。由于试验环境、结构构型和测点损失的影响,试验效率值需要修正后才能作为工程应用中性能评价和整机匹配的依据。本文提出了压气机试验效率的工程修正方法,对不同试验环境中压气机效率的影响因素进行系统分类,给出了雷诺数、进口过渡段损失、温度测量偏差、空气湿度和测试受感部损失等因素的具体修正方法。应用该方法对某10级压气机部件的试验效率进行修正,修正后效率提升了1.85%;对整机环境下压气机试验效率进行修正,修正后效率提升了0.95%。该方法可用于核心机/整机压气机试验效率修正和性能评定中。

Efficiency is the key parameter for evaluating compressor performance of the aero engine.It is usually acquired by compressor performance tests.Due to the difference in test condition,mechanical configuration,and instrumentation loss,efficiency obtained from compressor rig tests should be corrected for evaluating performance and engine matching in the engineering field.An engineering approach for correcting the compressor efficiency was proposed.The influence factors of the compressor efficiency were classified systematically under different test conditions,and detailed methods of correcting Reynolds number,inlet strut loss,thermo-couple Mach number recovery,air humidity and probe loss were given.Two examples were conducted using this method.The efficiency of a ten-stage compressor component rig test was corrected by 1.85 percent improvement.Besides,in the engine test,the compressor efficiency was corrected by 0.95 percent improvement.This method can be applied in the engineering field of efficiency measurement correction and performance evaluation for core and whole engines.