Simulation And Investigation On Flow Field And Temperature Field Of Passenger Compartment

In recent years, as the car toward to the direction of comfort, people’s demand on thermcal comfort is increasing, thus the research on the thermal comfort of the passenger compartment is concerned more and more by the research scholars. Numerical simulation of flow field and temperature field inside passenger compartment using the computational fluid dynamic and computational heat transfer can predict passenger compartment thermal environment quickly and efficiently, which is an important method of the research on thermal comfort of the passenger compartment.In this paper, the passenger compartment thermal environment of an air-conditioned vehicle had been studied with combining experiment and numerical simulation. The heat transfer feature and the calculation method of the heat transfer in each parts of passenger compartment was studied. The silulation model was established by FLUENT. The cooling power of air-conditioning system was calculated and analyzed. Also the distribution law of flow field, temperature field and humidity inside the car were obtained in idle, middle and high speed condition. At last, the influence law of air humidity, air temperature and average radiation temperature on thermal comfort were obtained utilizing the PMV-PPD thermal comfort evaluation index. And the feasibility of the application of heat insulation glass on the improvement of thermal environment and human thermal comfort were also quantitative analyed.The research results showed that the temperature in front and rear windshield area is high because of the solar radiation and the layout of the air-conditioning system. Air temperature and air relative humidity are two factors that affect each other. Air relative humidity can be adjusted through air temperature’s adjustment in ordinary air-conditioning car that with no function of humidity adjustment. In thermal comfort study, lower air humidity can increase people’s feeling of cold, higher air humidity can increase people’s feeling of warm. The thermal comfort can be increased by decreasing surface’s temperature of the passenger compartment. In the study of heat insulation glass, the solar transmitted radiation can be controlled through the application of heat insulation glass, thus decreasing average solar transmitted radiation intensity by 14.4% and average temperature in the panel area by 2.5℃.This thesis is to establish a highly efficient and feasible numerical simulation method on passenger compartment. The proposed research methods and results are helpful to the design and lectotype of air-conditioning system, as well as the research on the thermal environment and human thermcal comfort in the passenger compartment.