摘要
采用计算流体力学的方法,对某航空涡轴发动机试车台的多级嵌套式引射排气系统进行数值模拟。为提高计算准确度,选取试验中放气活门关闭的发动机状态作为计算工况。结果表明,当引射筒存在间隙时,高温燃气将通过此间隙回流至试车间,导致引射筒丧失引射作用,增加了试验风险。此外,发动机表面气流的反向流动对机匣表面的冷却产生不利影响,甚至可能导致发动机进气不均匀而产生畸变效应。间隙封堵后,发动机周围流线整齐,且试车间内无燃气回流,提高了试验安全性,为发动机试车台多级引射排气系统的设计提供了参考依据。
The computational fluid dynamics method is used to simulate an aero turboshaft engine test rig with multistage nested ejector exhaust system.In order to improve the accuracy of the calculation,the engine state with the bleed valve closed in the test is selected as the calculation condition.The results show that when there is a gap in the ejector cylinder,the high temperature gas will flow back to the test room through the gap,and the ejector cylinder will lose the ejection effect,which increases the risk of the test.In addition,the reverse flow of the engine surface air will have an adverse effect on the cooling of the casing surface,and may even lead to the engine intake uneven and distortion.After sealing the gap,the streamline around the engine is neat,and there is no gas return in the test room,which improves the test safety.It provides a reference for the design of multi-stage ejector exhaust system of engine test bench.
作者
傅佩颖
朱明明
龙合良
FU Peiying;ZHU Mingming;LONG Heliang(Hunan Power Machinery Research Institute of China Aviation Development Corporation,Zhuzhou 412002)
出处
《现代制造技术与装备》
2021年第2期8-11,共4页
Modern Manufacturing Technology and Equipment
