Study On The Numerical Simulation And Structure Optimization Of Fin-tube Double Channels Radiator

Radiator is an important part of diesel engine cooling system,which is installed in diesel locomotive cooling room to cool the engine,keeping the engine temperature within a certain range.Fin-tube double channels radiator is widely used in ND2 type 191 and 037,dongfeng 9 and dongfeng 11 locomotive because of its strong cooling capacity,compact structure,etc.The study of decreasing the pressure loss,strengthening the surface heat transfer and flow,distributing the area and heat release of double channels high and low temperature part reasonably is necessary.In this paper,studied locomotive fin-tube double channels radiator heat dissipation performance using CFD simulation and experimental method.First calculated common flat fin-tube double channels radiator which has high reliability and low resistance,got the change rule of flow field distribution and heat transfer performance,doing structure optimization on the basis of common flat fin,opened the shutters on flat fin to enhance the heat transfer coefficient,got the change rule of flow field distribution and heat transfer performance of the optimized radiator,compared and analyzes the heat dissipation characteristics of optimized radiator and before optimized radiator,the results show that the open shutters radiator heat transfer coefficient increased 37.28%,resistance increased by 62.17% compared to common flat fin radiator.Later,doing matching calculation for heat release and cooling area of fin-tube double channels radiator which opened shutters,keeping length,width,and shutters conditions unchanged of the radiator,observing the variation of high and low temperature sections heat release by changing the high and low temperature sections fin spacing.Results show that high and low temperature cooling part heat release,total heat release and pressure loss are decreased with the increase of the fin spacing.Increasing the fin spacing,heat release of high temperature cooling part a slight increased in the proportion of total heat release and the range is not big.Last tested the radiator under different cooling air inlet velocity,compared test results and simulation results,the greatest relative error of the heat transfer coefficient and pressure loss were 7.21% and 7.72%,verified the feasibility of the simulation model and simulation method.