航空学报 > 2010, Vol. 31 Issue (7): 1305-1311

气-气冷流掺混流场缩尺技术

汪小卫, 金平, 蔡国飙   

  1. 北京航空航天大学 宇航学院
  • 收稿日期:2009-06-20 修回日期:2009-12-13 出版日期:2010-07-25 发布日期:2010-07-25
  • 通讯作者: 蔡国飙

Scaling of Gas-gas Cold Flow Fields

Wang Xiaowei, Jin Ping, Cai Guobiao   

  1. School of Astronautics, Beijing University of Aeronautics and Astronautics
  • Received:2009-06-20 Revised:2009-12-13 Online:2010-07-25 Published:2010-07-25
  • Contact: Cai Guobiao

摘要: 为研究气-气冷流掺混流场缩尺技术,对多组分气相掺混流动三维Navier-Stokes无量纲方程及其定解条件进行了相似性分析,并将量纲分析方法应用到气-气掺混流动现象中,获得了气-气掺混流场相似准则,该相似准则表明冷流掺混试验件尺寸和试验背压都可以变化;运用该准则,在不同背压工况下进行了3个不同尺寸试验件的单喷嘴气-气喷注器掺混流场的仿真分析和比较,结果表明不同试验件尺寸和不同压力工况下气-气掺混流场具有相似性。研究结果能够指导气-气冷流试验,并为气-气燃烧流场缩尺技术研究提供参考。

关键词: 缩尺, 相似, 冷流, 全流量补燃循环, 气-气混合, 数值分析

Abstract: Theoretical analysis is performed of the scaling of gas-gas cold flow fields and numerical studies made on the scaling of the flow fields in single-element chambers with gaseous oxygen and gaseous hydrogen. To obtain the scaling criterion of a gas-gas cold flow field, formulation analysis of the gaseous multi-component mixed flow 3D Navier-Stokes equations is conducted and dimensional analysis is also applied to the gas-gas mixing phenomena. The criterion indicates that the size and the testing back pressure of a gas-gas injector chamber can be changed. Based on the criterion, numerical simulations of full-scale and subscale single-element gas-gas injector chambers are studied in a total of three conditions. The results demonstrate that the flow field structures of similar geometry hardwares are similar at different testing back pressures.

Key words: scaling, similarity, cold flow, full flow stage combustion cycle, gas-gas mixing, numerical analysis

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