摘要
为了研究大涵道比分开排气发动机在高空舱内的排气流场特性,对其开展了流场数值模拟及试验验证。建立了一种发动机喷管、高空舱和排气扩压器的联合仿真模型,分别计算了不同喷管落压比状态下的发动机推力和排气流场特性,通过对比得到不同落压比下流场的变化规律。对大涵道比分开排气发动机进行了高空模拟试验,对不同落压比下的推力和高空舱内固定测点的总压与静压进行测量,并与数值模拟计算结果对比。结果表明:落压比越大,发动机射流影响范围越大,射流边界外扩,排气扩压器效率越低。推力系数随着落压比的增大呈现减小趋势。计算值与试验值结果相近,绝大多数测点的压强误差和推力误差保持在5%以内。
In order to study the characteristics of exhaust flow field of high bypass ratio engine in altitude simulation chamber,numerical simulation and experimental verification were carried out.The joint simulation model of engine nozzle,high altitude cell and exhaust diffuser was established.The engine thrust and exhaust flow field characteristics under different nozzle pressure ratio(NPR)conditions were calculated respectively.The flow field variation under different NPR conditions was studied.Finally,a high-altitude simulation test was conducted for a high bypass ratio engine.The engine thrust,total pressure and static pressure at fixed measurement points in altitude simulation chamber were measured at different NPR and compared with the numerical calculation results.The results show that as NPR increases,the influence range of the engine jet becomes larger,the jet boundary expands broader,and efficiency of the exhaust diffuser becomes lower.The thrust coefficient tends to decrease with the increase of NPR.The calculated value is similar to the test results.The error of pressure and thrust in most measurement points are kept within 5%.
作者
常心悦
王豪
曹凡
李康
闵浩
唐智礼
CHANG Xinyue;WANG Hao;CAO Fan;LI Kang;MIN Hao;TANG Zhili(Civil Aviation Power Altitude Simulation Key Laboratory of Sichuan Province,Mianyang 621000,China;Key Laboratory of Unsteady Aerodynamics and Flow Control,Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《燃气涡轮试验与研究》
2023年第3期17-24,共8页
Gas Turbine Experiment and Research
基金
国家财政稳定支持项目(GJCZ-0050-20)。
关键词
航空发动机
高空舱
流场特性
高空模拟试验
发动机推力
数值模拟
aero-engine
altitude simulation chamber
flow characteristics
high altitude simulation test
engine thrust
numerical simulation
