Volume 38, Number 2, April 2020
|Page(s)||303 - 308|
|Published online||17 July 2020|
Study on the Effect of Oval Tubes on Airflow Turbulence Characteristics in Wind Tunnel
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
2 Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
The flow Turbulence characteristics of finned oval tube heat exchanger used in wind tunnel were studied by using numerical simulation method. Firstly, the reliability of the numerical method was verified by the experimental results. And then the research was focused on the comparative analysis of the characteristics of turbulent flow downstream of heat exchanger under different inflow conditions, and the influence of the tubes number and fins spacing on the airflow turbulence and the flow field distribution downstream of heat exchanger were obtained too. The results indicate that oval tubes have a significant effect for improving the flow quality when incoming flow is inhomogeneous, and the velocity distribution behind heat exchanger tends to become uniform. Inflow conditions have a slight effect on the turbulence intensity behind heat exchanger, which mainly depends on the structural parameters of heat transfer tubes. The turbulence intensity decays very quickly in the flow direction. The value is reduced to 7.5% at the cross section 600 mm downstream of the heat exchanger inlet, which agrees well with the experimental result.
Key words: wind tunnel / heat exchanger / finned oval tube / turbulence characteristic / numerical simulation
关键字 : 风洞 / 热交换器 / 椭圆翅片管 / 湍流特性 / 数值仿真
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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