隔离段反压对激波串起始位置的影响

金亮; 吴先宇; 罗世彬; 王振国

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隔离段反压对激波串起始位置的影响
金亮¹, 吴先宇², 罗世彬³, 王振国⁴
1.防科技大学航天与材料工程学院湖南长沙410073;2.防科技大学航天与材料工程学院湖南长沙410074;3.防科技大学航天与材料工程学院湖南长沙410075;4.防科技大学航天与材料工程学院湖南长沙410076

摘要:

使用商业软件FLUENT对三维矩形截面隔离段流场进行了数值模拟。在来流马赫数2.3条件下,通过改变不同的反压来研究反压对不同长高比等截面隔离段和带扩张角隔离段激波串起始位置的影响。结果表明:隔离段长高比对反压与激波串起始位置之间的关系有非常大的影响,当长高比不是非常大时,激波串起始位置与反压成线性关系,当长高比超过此范围后,线性关系不再成立。

关键词: 超燃冲压发动机+ 隔离器数值仿真激波串+

DOI：

分类号:V235.21

基金项目:

Influence of back pressure on location of shock train in isolator

JIN Liang¹, WU Xian-yu², LUO Shi-bin³, WANG Zhen-guo⁴

1.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410073,China;2.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410074,China;3.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410075,China;4.Inst.of Aerospace and Material Engineering,National Univ.of Defence Technology,Changsha 410076,China

Abstract:

Numerical simulation of 3D isolators with rectangular cross section was performed with FLUENT.The Mach number of the inflow was 2.3.Isolators with different ratio of length to height(L/H) and divergence angle were investigated and the influence of back pressure on location of the shock train was analyzed.The results show that: the ratio of length to height has much influence on the correlation between location of the shock train and the back pressure.If the ratio of length to height is not too high,location of the first shock wave has a linear correlation with the back pressure.Otherwise,the linear correlation disappears.

Key words: Scramjet+ Isolator Numerical simulation Shock train+