Numerical Simulation And Experimental Study On Heat Exchanger Of Aero-acoustic Wind Tunnel

Aero-acoustic Wind Tunnel (AAWT) is an indispensable test facility to develop modern cars and rail vehicles with low drag, low noise, stability, safety, and comfort. AAWT with good performance not only depends on excellent flow quality and favorable acoustic performance of test section, but also embodies lower energy consumption. The energy consumption of AAWT is mainly decided by the fan that the power can reach several thousand kW. Dropping the pressure loss of diffuser, corner, and fan section can help to reduce the power of the fan. Heat Exchanger (HXC) is one of the key equipments of AAWT, and it accounts for 10 percent of total pressure loss of AAWT. Reducing the pressure loss of HXC is good for lowering the power of the fan. There are some key technical problems that must be sloved in the process of design and construction of AAWT, for example, heat transfer of airlines. Those technologies are blank in our country and the technical risk is biggish. This paper investigates the heat transfer, flow, fluid-induced vibration, and aero-acoustic of HXC so that it can reduce the technical risk, need the performance requirements of test section, reduce the energy consumption, and lower the investment and operating cost of AAWT.The frontier wind speed of HXC-AAWT can be changed in a large range from 0 m/s to 12 m/s, and high wind speed of HXC-AAWT exceeds traditional HXC^[1]. Thus, the reseach results of traditional HXC that can be used at electric power and Petrifaction industry are not applied to HXC-AAWT with high frontier wind speed and many operating conditions. The heat transfer and flow of HXC-AAWT are the important contents in this paper by using the methods of numerical simulation and test. That study aims at providing some guidelines for optimizing the design of HXC-AAWT. From the view of numerical analysis, three kinds of two equations k-ε models are discussed, and then a unit cell method is introduced to calculate the performances of heat transfer and flow, when fluid passes through rectangular finned elliptical tubes. Numerical simulations with five kinds of gird models, two kinds of boundary conditions, and three kinds of turbulence models are done, and the numerical results are compared with the test results of reference paper [2] .It can be...