发动机工作状态对排气扩压器流动特性的影响  

The Influence of Engine Operating Condition on the Flow Characteristics of the Exhaust Diffuser

作　　者：王韬竣 张健平[1] 但志宏 张松 李浩东 伍相全 WANG Taojun;ZHANG Jianping;DAN Zhihong;ZHANG Song;LI Haodong;WU Xiangquan(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Sichuan Gas Turbine Establishment,Aero Engine Corporation of China,Mianyang 621703,Sichuan,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]中国航空发动机集团有限公司四川燃气涡轮研究院,四川绵阳621703

出　　处：《西南科技大学学报》2024年第2期92-99,共8页Journal of Southwest University of Science and Technology

基　　金：中国航发四川燃气涡轮研究院高空模拟技术国防科技重点实验室稳定支持资助项目(20zh0149);中国航发四川燃气涡轮研究院外委课题(21zg8112)。

摘　　要：为了准确描述发动机工作状态对高空台排气扩压器流动特性的影响,采用Fluent软件数值模拟分析了3 km和5 km飞行高度,发动机中间状态、小加力状态和最大状态下高空台排气扩压器气流压力、速度、温度的变化规律。结果表明:飞行高度为3 km和5 km时,相同状态下排气扩压器内气流压力、速度、温度变化趋势基本一致。经过排气扩压器扩压减速后,发动机中间状态、小加力状态和最大状态下气流静压增加了12%,21%,25%,气流速度衰减了79%,80%,76%。当发动机工作状态从中间状态转变为最大状态时,排气扩压器内气流温度逐渐升高,波动也越大。To accurately describe the influence of the engine’s working state on the flow characteristics of the exhaust diffuser of the altitude test facilities,Fluent was used to numerically simulate and analyze the variation of the air pressure,velocity,and temperature in the exhaust diffuser under 3 km and 5 km flight heights,the engine in the intermediate state,partial thrust state and maximum thrust state.The results show that when the flight heights were 3 km and 5 km,the variation trends of pressure,velocity,and temperature in the exhaust diffuser were basically consistent under the same conditions.After the expansion and deceleration of the exhaust diffuser,the static pressures of the engine in the intermediate state,partial thrust state,and maximum thrust state increase by 12%,21%,and 25%,respectively,and the air speeds decrease by 79%,80%,and 76%,respectively.When the engine’s working state changes from the intermediate state to the maximum state,the air temperature in the exhaust diffuser gradually increases,and the fluctuation is greater.

关 键 词：发动机工作状态 排气扩压器 流动特性 数值模拟分析 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]