Numerical Simulation Of Air-conditioned Sedan Car Indoor Air

The thesis is based on Computational Fluid Dynamics (CFD), and a three-dimensional model of air-conditioning car is set up with a simplified vehicle compartment and RNG k - ε double-equation turbulent stream model. The corresponding boundary conditions of this issue are also established. In this way, a complete mathematical description and controlling equations of internal temperature and velocity field of air-conditioning car is available.The air current distribution in air-conditioning vehicle is compared and analyzed qualitatively and quantificationally about different air supply parameters, such as temperature, velocity, distribution angle and air vent position. With commercial software FLUENT as the operational platform, the outcomes of the velocity field as well as temperature field are obtained. The numerical results become visible and vivid with software TECPLOT. And the data is processed to get temperature coefficient of ununiformity, velocity coefficient ununiformity and air diffusion performance index. Thus the basis of the optimization can be provided.From the result, we can conclude: when the air supply velocity increases, the temperature will generally drops;when the air supply temperature increases, the speed of flow is basically invariable and the temperature generally elevates;the change of supply angle don't have tremendous influence on the flow;and the air vent positions have no big influence on the temperature field of the rear compartment. If the air supply velocity is too high or low, the ADPI target of each computation section will be somewhat low. When the supply speed increases, the speed and temperature nonuniformity coefficient of each computation section will reduces, but the scope of reduction is not big. Therefore it is not necessary to increase blast speed by leaps and bounds to pursue lower nonuniformity coefficient. The change of the blast temperature basically has no influenceon the temperature nonuniformity coefficients of III and IV plane. Different supply anglesalso affect the temperature coefficient of IV plane slightly. When the cold shoulder reduce,it is wise to reduce the supply speed or elevate the supply temperature. It not only may obtain the similar air conditioning effect with the capacity load, but also can be helpful to save the energy.At last the future research on this subject is brought forward.