流体力学与飞行力学

连续旋转爆轰发动机冷流场的混合特性研究

  • 周蕊 ,
  • 李晓鹏
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  • 1. 北京应用物理与计算数学研究所 计算物理重点实验室, 北京 100094;
    2. 中国科学院力学研究所 高温气体动力学国家重点实验室, 北京 100190
周蕊,女,博士,助理研究员。主要研究方向:爆轰数值模拟。Tel.:010-59872153,E-mail:ameliazhr@163.com

收稿日期: 2016-01-11

  修回日期: 2016-03-31

  网络出版日期: 2016-04-08

基金资助

国家自然科学基金(11602028,11502029)

Numerical investigation of mixing characteristic of cold continuously rotating detonation engine

  • ZHOU Rui ,
  • LI Xiaopeng
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  • 1. Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;
    2. State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Received date: 2016-01-11

  Revised date: 2016-03-31

  Online published: 2016-04-08

Supported by

National Natural Science Foundation of China (11602028, 11502029)

摘要

连续旋转爆轰发动机(CRDE)中燃料和氧化剂的快速掺混是实现爆轰波成功起爆和稳定传播的重要前提,然而目前国际上关于这方面的研究还相对较少。本文采用大涡模拟(LES)方法,对非预混CRDE中燃料和氧化剂的混合过程及其主要机理开展深入研究。研究结果表明,非预混CRDE流场中存在欠膨胀特征、大尺度涡结构,以及回流区等复杂的流动现象,其中由于Kelvin-Helmholtz(K-H)不稳定性产生的大尺度湍流涡结构是促进氢/氧混合的主要机制。此外,本文还考察了氧气喷注位置对非预混CRDE的流场结构和混合特征的影响,发现氧气喷注位置会影响射流剪切层形态、涡尺度,以及回流区分布等,进而影响氢气和氧气射流的混合过程和混合程度。与其他进气位置相比,氧气在靠近内壁面喷注时更有利于氢/氧的快速掺混。

本文引用格式

周蕊 , 李晓鹏 . 连续旋转爆轰发动机冷流场的混合特性研究[J]. 航空学报, 2016 , 37(12) : 3668 -3674 . DOI: 10.7527/S1000-6893.2016.0108

Abstract

Rapid mixing of fuel and oxidizer is the necessary condition for successful initiation and stable propagation of detonation in continuously rotating detonation engine (CRDE). However, there has been few studies on the mixing characteristic of fuel/oxidizer. Two-dimensional larger eddy simulation (LES) is carried out to investigate the hydrogen/oxygen injection and mixing processes in non-premixed CRDE, and reveal the fuel/oxidizer mixing process and main mechanism. Results show that there are underexpanded feature, large scale eddy structure and recirculation zone in the non-premixed CRDE. The turbulence eddy structure generated by the Kelvin-Helmholtz (K-H) instability is the main mechanism for promoting the hydrogen/oxygen mixing. The influence of injection position of oxygen jet on the flow structure and mixing characteristics is also explored. It is found that the injection position of oxygen jet can affects the jet shear layer, vortex size and recirculation zone distribution, and then the mixing process and the mixing degree of the hydrogen and oxygen jets. It is more conducive to rapid mixing of hydrogen/oxygen when the oxygen is injected near the inner wall rather than at other injection positions of CRDE.

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