激波在异种气体中传播及诱导的剪切混合研究

徐胜利; 岳朋涛; 韩肇元

激波在异种气体中传播及诱导的剪切混合研究

中国科学技术大学力学和机械工程系, 合肥230026

基金项目: 国家自然科学基金资助项目(19882005);863高技术青年基金资助项目(863-2999)

详细信息

作者简介:
徐胜利(1965- ),男,安徽人,副教授,博士,发表论文22篇.

中图分类号: O354.3;O354.5;O357.52
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- 文章访问数: 2257
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- 被引次数: 0
出版历程
- 收稿日期: 1999-04-16
- 修回日期: 1999-08-02
- 刊出日期: 2001-04-15

Study on the Fuel Air Mixing Induced by a Shock Wave Propagating Into a H₂-Air Interface

Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, P R China

摘要

摘要: 利用二阶迎风TVD格式求解多组分、层流全N-S方程。针对直通道和突扩直通道,研究了马赫数为2和4的激波在H₂和空气界面上的传播及诱导的燃料剪切混合。计算结果表明:(1)直通道中,剪切层中的激波阵面要发生畸变,存在对混合起主要作用的卷吸涡,激波马赫数不同,卷吸涡结构和横向混合的尺寸也不同。激波马赫数低,剪切混合效果好。(2)在突扩直通道中,马赫数为2和4的激波在H₂中产生不同强度激波,在剪切层中都能产生顺时针、尺度较大的卷吸涡,后台阶增强了剪切层的混合。
- 激波 /
- 卷吸涡 /
- 剪切层 /
- 燃料混合 /
- 数值模拟
Abstract: 2nd order upwind TVD scheme was used to solve the laminar,fully Navier-Stokes equations.The numerical simulations were done on the propagation of a shock wave with Ma_S=2 and 4 into a hydrogen and air mixture in a duct and a duct with a rearward step.The results indicate that a swirling vortex may be generated in the lopsided interface behind the moving shock.Meanwhile,the complex shock system is also formed in this shear flow region.A large swirling vortex is produced and the fuel mixing can be enhanced by a shock wave at low Mach number.But in a duct with a rearward step,the shock almost disappears in hydrogen for Ma_S=2.The shock in hydrogen will become strong if MaS is large.Similar to the condition of a shock moving in a duct full of hydrogen and air,a large vortex can be formed in the shear flow region.The large swirling vortex even gets through the reflected shock and impacts on the lower wall.Then,the distribution of hydrogen behind the rearward step is divided into two regions.The transition from regular reflection to Mach reflection was observed as well in case Ma_S=4.
- shock wave /
- swirling vortex /
- shear layer /
- fuel mixing /
- numerical simulation

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参考文献(7)

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