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欠膨胀超声速射流不稳定性机理的数值研究
NUMERICAL INVESTIGATION INTO THE MECHANISM OF UNDER-EXPANDED SUPERSONIC JET INSTABILITY
查看参考文献8篇
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文摘
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应用NND有限差分格式求解轴对称可压缩N-S方程,研究了不同驻室与环境压力比条件下欠膨胀超声速射流近场的失稳特性.计算结果表明欠膨胀超声速射流的失稳机制根据射流激波结构的特征可分为3种失稳模式:具有规则反射激波结构和单一剪切层特征的射流不稳定性;带有马赫反射激波结构和双剪切层特征的射流不稳定性;具有弯曲马赫杆和高度欠膨胀射流的不稳定性.对于欠膨胀超声速射流,沿射流方向重复出现拟周期性的射流激波结构是射流稳定发展的特征,这种射流激波结构的消失是射流开始失稳的标志. |
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其他语种文摘
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The numerical investigation into the instability of the under-expanded supersonic jets is presented in this paper by solving the axisymmetric N-S equations with the NND finite difference scheme. Numerical results demonstrated that there are three kinds of the instability for the under-expanded supersonic jets according to their shock cell structure patterns: (1) the regular reflection shock cell with a single shear layer, (2) the Mach reflection shock cell with two shear layers and (3) the curved Mach stem with a relatively high expansion ratio. Moreover, for the under-expanded supersonic jets, the repetitively-generated quasi-steady shock cells in the jets indicate their stable development and the disappearance of these shock cells implies that the jets are about to fall into instable states. |
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来源
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力学学报
,2008,40(5):577-584 【核心库】
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关键词
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欠膨胀超声速射流
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射流不稳定性
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射流激波结构
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剪切层
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数值模拟
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地址
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1.
中国科学院力学研究所, 高温气体动力学重点实验室, 北京
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北京航空航天大学流体力学研究所, 北京
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0459-1879 |
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学科
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自动化技术、计算机技术 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:3498542
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8
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