特种车辆舱室送风系统布局仿真优化

Because of its special function and closeness, special vehicles can not use the opening and closing of windows to control cabin ventilation like civil vehicles, drive special vehicles for a long time, the cockpit faces small space, less cold source, large heat load, lack of fresh air, and the external environmental conditions are complex. This requires the fine design of the air supply system for special vehicle compartments to meet the thermal comfort and thermal control needs of personnel and multiple devices, so it is necessary to optimize the ventilation system based on the cockpit characteristics of special vehicles to ensure the thermal requirements of the whole cabin. In order to make the heat exchange between the cockpit air supply and the heat source in the cabin as complete as possible and bring out more heat, this paper first establishes the three-dimensional physical model and simulation model of the typical cabin and crew for a special vehicle. The simulation and optimization analysis of air distribution for 10 kinds of air supply modes is carried out, and the multi-physical field of special vehicle cabin is obtained. The optimization of air distribution is carried out from two aspects: tuyere form and tuyere position. In the tuyere form optimization, a variety of tuyere combination forms are proposed and simulated respectively. Aiming at equipment temperature control, personnel thermal comfort and air age, the simulation results are evaluated by using evaluation function, and 10 types of air supply conditions are simulated. From the simulation results, based on the above multi-optimization objectives, the tuyere position optimization for the preliminary optimal air supply form is further carried out. On the basis of the optimization results of tuyere form, genetic algorithm is used to set the position parameters as optimization parameters, two evaluation functions are selected as the optimization objective functions, and the constraint conditions such as head and foot temperature difference are set to the optimization model. The simulation results are screened and the inverse optimization is carried out. Finally, the optimal tuyere position is obtained and the optimization of air distribution is completed. This study has certain significance for the study of limited space thermal comfort and air quality of fully sealed special vehicles.