蜂窝板预埋管路辐射器流动散热特性仿真OA北大核心CSTPCD

In order to solve the problem that it is difficult for traditional numerical methods to evaluate the convective heat transfer coefficient and predict the flow and heat dissipation performance of a radiator accurately,the influence of the operating parameters and gravity on the flow and heat dissipation characteristics of a radiator is studied,and the lightweight design and ground test of the radiator are investigated.Based on the analyses,an equal size simulation model coupling the heat conduction,convection,and radiation heat transfer of the radiator is built.The reliability in predicting the hydrodynamic and thermal characteristics obtained by the simulation model and empirical formulae is evaluated.The effects of the flow rate,inlet temperature,absorbed external heat flux,and gravity on the working characteristics of the radiator are analyzed.The results show that the maximum relative errors of the pressure drop and heat dissipation power of the radiator between the simulated values and the vacuum thermal test data are 3.45％and 2.86％,respectively,and the maximum relative errors of the pressure drop and heat transfer coefficient between the values predicted by the empirical formulae and the values obtained by the simulation are-10.15％and-33.18％,respectively.The radiator heat dissipation power increases when the flow rate and inlet temperature increase.The increase in the absorbed external heat flux will reduce the convective heat transfer rate.Compared with zero gravity,the heat dissipation power of the horizontal radiator in the normal gravity can be increased by 2.86％.The presented model can predict the working characteristics of the radiator accurately.For the radiator design,the flow rate and inlet temperature should increase while the requirements of the pressure drop and outlet temperature are satisfied,and the radiator should be placed vertically in ground tests.