| 摘要: |
| 对扩压器内单喷口射流产生的流向涡控制扩压器内部边界层分离流动行为进行了研究。研究的对象是一个扩张角为10°的二维扩压器,扩压器进出口面积比为1∶4.7,入口高度为15 mm。采用数值计算方法研究了当射流出口速度为非稳态时对分离流动的影响。给出了不同时刻,不同截面上的旋涡涡量分布。结果表明,采用非稳态喷射流向涡方法可以在不改变主流流量特性的情况下,有效地减小分离流动区域。 |
| 关键词: 扩压器 边界层分离控制 非稳态气流喷射 流向涡 |
| DOI： |
| 分类号:V231.1 |
| 基金项目:国家自然科学基金(50676011) |
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| Numerical simulation on separation in a diffuser for a pulsed flow vortex-generator jet |
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LIU Jing-biao, YANG Ce, CHEN Shan, MA Chao-chen
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School of Mechanical and Vehicular Engineering,Beijing Inst.of Technology,Beijing 100081,China
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| Abstract: |
| The application of pulsed jet vortex generators to control flow separation in a diffuser with an opening angle of 10° has been studied using the computational fluid dynamics(CFD) code fluent.The section of the duct upstream of the diffuser has height H of 15 mm and breadth of 41H,respectively.The diffuser has an expansion ratio of 4.7∶1.The vortex distribution of different sections in different time is showed.The results indicate that the pulsed jet vortex generators can reduce the separated flow regions effectively and the jet does not change the flow characteristics of the mainstream. |
| Key words: Diffuser Boundary layer separation control Pulsed vortex-generator jet Vortex flow |
