The Numerical Simulation Of The Ventilation And Heat Dispersion Of The Cabin For Military Communication Generator Set

The generator set cabin for military communication is the new equipment of military communication vehicle during the "tenth five-years" of the PLA. The ventilation and heat dispersion of the generator set is a very important to affect the normal working of the whole equipment. Presently, in the design of the ventilation and heat dispersion of the cabin, only necessary wind quantity is considered simply, while detailed mode and efficiency of the ventilation and heat dispersion are not considered too. So maybe the resource is wasted by the equipment, while noise is increased and stealth ability is decreased. After the whole army is equipped with the generator set cabin, the feedback information of user indicates that the generator set can't work in gear because of excessive high temperature in some bad conditions. Therefore, the solution to ventilation and heat dispersion of the cabin is a great problem. The numerical simulation is performed by the FLOTRAN module of the famous ANSYS software in the dissertation. To the cabin which is designed by the forth department ChongQing Communication College, the model which includes the air in the cabin, generator set and public muffler is built integer ,meshed, and added by boundary condition and load. The normal k-ε model etc are used to be turbulence model of the air in cabin respectively, the turbulence model is calculated by SIMPLEF or SIMPLEN algorithm, and by the first order accurate MSU or the second order accurate SUPG in advection discretization scheme. The numerical simulation of the cabin indicates: The normal k-ε model is adaptive to simulate the air flow; the SIMPLEN algorithm can satisfy the requirement of calculation for its rapid convergence velocity; the second order accurate SUPG in advection discretization scheme can attain more precise result. Only the wind-in door near the working generator set is opened, and exhaust fan is installed in the middle of the cabin. The ventilation and heat dispersion are enhanced by the two methods, making the wind-in door move toward below and making exhaust fan move toward below. But the effect of making the wind-in door move toward below is the main influence ingredient. When wind-in door is below and exhaust fan is below, the ventilation and heat dispersion of the cabin is enhanced furthest, both the average and maximumtemperature of all sides of the generator set can be decreased (beyond 2℃). So it can enhance the ventilation and heat dispersion of the cabin, and decrease noise of wind-in door. The numerical simulation to the ventilation and heat dispersion of the cabin is exact relatively and the air flow and temperature distributing are reflected really when the FLOTRAN module of ANSYS software is used.