Research on the Relation between Automotive Air Conditioning Supply-Air Direction and Cooling Efficiency about Thermal Field of the Passenger Compartment

Abstract

The cooling process of unsteady temperature field in the automobile passenger compartment is simulated , making use of computational fluid dynamics software FLUENT and the algorithm of PBCS ,and two equation model is replaced with the three-dimensional turbulence model. And then the workflow is established, which includes DOE, optimization algorithm, approximate model and the numerical simulation. Numerical simulations uses experimental design method to collect data for analysis into the relations and trends of the supply-air direction and the cooling efficiency.The sample points train approximation model, using radial basis function (RBF) neural network approximation model instead of the high cost of the simulation calculation. Multi-island GA is chosen to optimize the supply-air direction. The supply-air direction optimized and the supply-air direction vertical surface of inlet tuyere are calculated by simulation software respectively.Results show that the optimized direction making the car chamber cooling effect is remarkable, by the analysis of the heat flow value and temperature contours of before and after optimization.