• 首页期刊介绍编委会期刊订阅广告合作联系我们English
  • 选择皮肤:
丛成华,秦红岗,任泽斌.风洞T型冲击三通管道流场特性数值模拟[J].航空动力学报,2020,(2):235~243
风洞T型冲击三通管道流场特性数值模拟
Numerical simulation of flow field characteristics of impacting T-junction duct in wind tunnel
投稿时间:2019-09-19  
DOI:10.13224/j.cnki.jasp.2020.02.002
中文关键词:  T型冲击三通  对称分离  非对称流场  流动控制  型面优化设计
英文关键词:impacting T-junction  symmetry separation  asymmetry flow field  flow control  shape optimal design  
基金项目:空气动力学国家重点实验室基金(SKLA2013A0208)
作者单位
丛成华 State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China
Facility Design and Instrumentation Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China 
秦红岗 Facility Design and Instrumentation Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China 
任泽斌 Facility Design and Instrumentation Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China 
摘要点击次数: 153
全文下载次数: 236
中文摘要:
      在24 m跨声速风洞进气管路T型冲击三通连接处和隔板位置,每隔一定时间会出现裂纹,影响了风洞的安全稳定运行。为了解裂纹出现的原因,同时为改进设计提供依据,采用CFD(computational fluid dynamics)对风洞现有三通和优化方案进行了对比。控制方程为三维黏性不可压缩Navier-Stokes方程。结果表明:无隔板时,三通内的流动为最常见的类型,支管内存在3个分离区,在转向过程中形成第1分离区,即马蹄涡;随后是第2分离区,一对反向旋转的旋涡,即Dean涡,及三通顶部壁面形成第3分离区。流场沿y=0 mm和z=0 mm平面基本呈对称分布。有隔板时,流场的左右和上下结构均不对称;在隔板和外侧壁面间的角点形成范围较小的驻涡,在支管内形成不稳定的螺旋状分离涡,致使气流振荡,从而使得三通连接和隔板处管壁出现裂纹。根据上述流态设计了管路优化方案和整流装置,优化后能有效减小或消除分离;其中去掉隔板最简单易行,可以解决裂纹的问题。
英文摘要:
      Cracks may occur at the connection of the impacting T-junction and the position of the clapboard at regular intervals in intake pipelines of 24 m transonic wind tunnel. In order to understand the causes of cracks and provide a basis for improving design,CFD (computational fluid dynamics) was used to compare the existing tee and optimization schemes in wind tunnel. The governing equations are three-dimensional viscous incompressible Navier-Stokes equations. The results showed that the flow in the tee was the most common type without clapboard. There were three separation zones in the branch pipe. The first separation zone was horseshoe vortex, followed by the second separation zone. A pair of reverse rotating eddies, Dean eddies, and a third separation zone were formed on the top wall of the tee. The flow field was basically symmetrical along the y=0 mm and z=0 mm planes. When there was a clapboard, the left and right structures of the flow field were asymmetrical and the upper and lower structures were also asymmetrical. A small range of standing vortices were formed at the corner between the clapboard and the outer wall, and unstable spiral separation vortices were formed in the branch pipe, resulting in air flow oscillation and causing cracks in the pipe wall at the tee connection and the clapboard. According to the above flow pattern, pipeline optimization scheme and flow control device were designed. Separation zones could be effectively reduced or eliminated. Removal of the clapboard was the simplest and easiest way to solve the problem of cracks in the pipe.
查看全文  查看/发表评论  下载PDF阅读器
关闭
.