航空发动机适航审定喘振与失速影响因素

Destabilizing factors on surge and stall characteristic in aero-engine airworthiness certification

将气动热力基础理论与适航领域工程问题有机结合,对典型的喘振和失速影响因素开展了系统的研究,发展了一套多影响因素作用下航空发动机稳定裕度快速预估方法;在此基础上以JT9D发动机为研究对象,开展了喘振和失速主要影响因素的影响规律研究,结果显示对风扇部件稳定裕度影响权重最大的是进气畸变,对增压级和高压压气机影响权重最大的是寿命期内结构衰变。研究结果进一步明确了喘振和失速适航条款符合性验证活动的关键要素,完善了条款适航符合性验证流程,为进一步提升我国民用发动机适航审定能力提供了技术支撑。

Combining aerothermodynamics theory with engineering problems in the airworthiness field, the representative destabilizing factors of engine surge and stall characteristics were investigated systematically. A fast method of surge/stall margin prediction was established, based on which the destabilizing factors and their laws of JT9 D engine model were studied. Results showed that the most important factor affecting the stability margin of fan components was distortion, and the most important factor affecting the stability margin of booster stage and high-pressure compressor was structural decay during the lifetime. The related key elements of CCAR 33.65 compliance verification activities have been confirmed. The compliance verification process of CCAR 33.65 has been improved, providing a technical support for airworthiness certification ability improvement.