民用飞机反推装置气动特性分析与验证

为验证国内某型民用飞机所用的格栅式反推装置设计方案是否满足适航标准,采用风洞试验对反推装置启动后指定速度区间范围内的反推效率、重吸入现象及其对静压测量的干扰进行了评估。试验结果表明:该套装置的反推效率在速度使用区间内能够维持在40%的水平以上,高于当前平均水平;通过监控温度场基本可以排除发生重吸入现象的可能性;反推气流会改变局部的流场及压力分布,但不会对静压测量造成明显干扰。此外,CFD仿真的结果与风洞试验的结论相互印证,再次验证了该反推装置设计方案的合理性。

Analysis and Validation of Thrust-Reversers Aerodynamic Characteristics for Civil Aircraft

In order to validate whether the cascade thrust-reversers design scheme of a civil aircraft is satisfied with airworthiness standard or not, the wind tunnel test was carried on to estimate aerodynamics characteristics such as thrust-reversers efficiency, "re-ingestion" phenomenon and disturbance to static pressure measurement within the range of required velocity. The test result shows that efficiency of the thrust-reversers is more than 40%, which is beyond current average standard, and occurrence of "re-ingestion" is almost eliminated by monitoring temperature-field. In addition, although the flow-field and pressure distribution are somewhat affected by thrust-reverse flow, static pressure measuring will not be disturbed. Besides, the result of CFD simulation is accorded with that of wind tunnel test, which is re-validate the feasibility of the thrust-reversers design scheme.