大膨胀比喷管性能工程估算方法  

Engineering Estimation Method of Large Expansion Ratio Nozzle Performance

作　　者：黄蓉 贾要强 李斌 HUANG Rong;JIA Yao-qiang;LI Bin(Beijing Power Machinery Institute,Beijing 100074,China)

机构地区：[1]北京动力机械研究所,北京100074

出　　处：《气体物理》2023年第3期64-69,共6页Physics of Gases

摘　　要：针对大膨胀比尾喷管,基于等熵假设、流量守恒,结合分离预测公式,发展了考虑分离的喷管性能工程估算方法,并利用数值仿真对文章的性能评估方法进行了验证,结果表明,考虑分离方法估算的推力性能随落压比的变化趋势与数值模拟结果基本一致,能够较好地评估大膨胀比喷管的性能上限,有效地弥补了过膨胀程度较高的低落压比工况下的推力性能预测能力,同时提高了高落压比范围的预测精度,可以为喷管设计提供直接指导。Based on isentropic assumption,mass conservation and separation prediction formula,an engineering estimation method of nozzle performance considering flow separation was developed for large expansion ratio nozzle,and the performance evaluation method was verified with numerical simulation in this paper.The variation trend of thrust performance with nozzle pressure ratio(NPR)estimated by present method is in good agreement with simulation results.The results indicate that the present method has a good predicting ability at highly over-expanded flow conditions and an accurate estimation on large NPR state.It can provide direct guidance for nozzle design.

关 键 词：大膨胀比 尾喷管 分离 性能估算 数值仿真 

分 类 号：V41[航空宇航科学与技术—航空宇航推进理论与工程]