飞机发动机室内开车尾气排放引射喷淋降温仿真分析

目的将气候实验室飞机发动机开车时产生的高温高噪声尾气实时顺利排出室外,保持试验所需的稳定环境场,避免排气不畅或可能的高温尾气回流对试验及试验设施产生破坏,保证试验安全可靠进行。方法设计一套发动机开车尾气排放系统,对关键的气体引流喷淋降温进行CFD数值模拟。结果喷流环孔径、喷射角度及数量分布均直接影响引射喷淋雾化效果。结论获得可以满足发动机开车尾气排放塔出口温度分布的喷淋环参数,指导引流管喷淋环的详细设计。

Simulation Analysis of Exhaust Drainage and Ejector Spray Cooling of Aircraft Engine Start

The work aims to discharge the high-temperature and high-noise exhaust gas generated by theclimatic environment test facilityduringtheaircraft engine startup test smoothly in real time, so as to maintain the stability of the test environment, prevent poor exhaust or high-temperature exhaust back-flow from damaging the test and facilities and ensure the safety and reliability of the test.A set of start-up exhaust drainage spray cooling was designed to carry out, CFD numerical simulation on key gas ejector spray cooling.The jet ring aperturre, spray angle and distribution directly affected the effect of spray atomisation and cooling.The parameters of spray ring that can meet the temperature distribution at the outlet of exhaust emission tower during engine start are obtained, which can guide the detailed design of spray ring of drain pipe.