| 高超声速边界层的转捩问题 |
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| 引用本文： | 曹伟.高超声速边界层的转捩问题[J].空气动力学学报,2009,27(5). |
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| 作者姓名： | 曹伟 |
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| 作者单位： | 天津大学力学系,天津,300072;南开大学,天津大学,刘徽应用数学研究中心,天津,300072 |
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| 基金项目： | 国家自然科学基金重大研究计划资助项目(90716007);;全国优秀博士学位论文作者专项基金资助项目(200328) |
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| 摘 要： | 取40km高空处的气体参数,对来流马赫数为8、10和12等三种不同情况的平板边界层和楔角为20°的楔型体边界层,做了转捩发生位置的预测。所用方法为改进的eN方法。结果发现,壁面条件对是第一还是第二模态波决定转捩位置有很大关系。如对于传统的eN方法,如果取N为10作为转捩判断标准,对马赫数为12的楔体边界层,等温壁条件下由第二模态波决定的转捩位置距前缘13m左右,而平板边界层中两模态波所决定的转捩位置距前缘均超过50m。而采用改进的eN方法,平板边界层中两模态波所决定的转捩位置距前缘均超过10m,而对马赫数为12的楔体边界层,两模态波所决定的转捩位置距前缘均出现小于5m的情况。
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| 关 键 词： | 高超声速 边界层 转捩 |
A study of the transition prediction of hypersonic boundary layer on plane and wedge flow |
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| CAO Wei.A study of the transition prediction of hypersonic boundary layer on plane and wedge flow[J].Acta Aerodynamica Sinica,2009,27(5). |
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| Authors: | CAO Wei |
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| Institution: | 1.Tianjin University;Tianjin 300072;China;2.Liu Hui Center of Applied Mathematics;Nankai and Tianjin University;China |
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| Abstract: | In this paper,the position of transition was predicted of hypersonic boundary layer on the plane and wedge with 20 degree angle.The flow parameters were taken as those corresponding to the condition at a height of 40km and the Mach numbers of oncoming flow were 8,10,12 respectively.The improved eN method was used to give transition position.It is found that the wall condition affect whether the first or the second mode wave plays a dominant role in transition.According to the results of the traditional eN m... |
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| Keywords: | hypersonic flow boundary layer flow transition |
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