欠膨胀椭圆射流的流动结构

张焕好; 郭则庆; 陈志华; 郑纯; 黄振贵

doi:10.13224/j.cnki.jasp.2017.12.024

欠膨胀椭圆射流的流动结构

doi: 10.13224/j.cnki.jasp.2017.12.024

南京理工大学瞬态物理重点实验室,南京 210094

基金项目: 国家自然科学青年基金(11502117）; 中国博士后基金（2015M571757）

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出版历程
- 收稿日期: 2016-05-27
- 刊出日期: 2017-12-28

Flow structure of underexpanded elliptic jet

摘要

摘要: 为了探讨超声速欠膨胀椭圆射流的流动特征,采用大涡模拟（LES）方法与高精度混合格式对出口压力比N分别为14、24、40的欠膨胀椭圆射流流场结构进行数值模拟。结果清晰描述了欠膨胀椭圆射流的三维(3D)结构特征与发展规律,并分析了因喷嘴方位曲率不一致而导致长轴与短轴平面上激波结构出现差异的原因。另外,结果还发现:当N为24时,短轴平面上射流域内的激波结构已由正规反射转变为马赫反射,但长轴平面上仍维持正规反射,而当N为40时,长轴与短轴平面上的激波结构均为马赫反射结构,由此可知喷嘴方位曲率变化越平缓,马赫反射形成所需的出口压力比越大。
- 欠膨胀射流 /
- 椭圆射流 /
- 激波 /
- 马赫反射 /
- 大涡模拟
Abstract: To reveal the flow characteristics of a supersonic underexpanded elliptic jet, the flow structures of underexpanded elliptic jets at the nozzle pressure ratio N of 14, 24 and 40 were simulated using largeeddy simulation (LES) in combination with the high order hybrid schemes. The threedimensional (3D) flow characteristics and the evolution of underexpanded elliptic jet were illustrated from the results, and the reason for the different shock structures of the minor and major axis planes introduced by nonuniform curvature of the nozzle was discussed. Moreover, the results also found that the Mach shock reflection happened on the minor axis plane at N being 24, but regularreflection remained on the major axis plane. The shock structure of both major and minor axis planes were transferred into Mach reflection when N was 40. Therefore, the nozzle pressure ratio introducing the Mach shock reflection increases as the nozzle curvature radius becomes gentle.
- underexpanded jet /
- elliptical jet /
- shock wave /
- Mach shock reflection /
- largeeddy simulation

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