| As an important means to improve the comfort and safety of the passenger compartment,automobile air conditioners are being valued more and more,and its performance has become the main competition method for automobile manufacturers in the market.With the rise of new energy vehicles in this century,the battery power in the car is fixed and closely related to the mileage of the car.This has imposed new requirements on the performance and energy efficiency of car air conditioners to reduce their mileage.Impact.At the same time,reasonable airflow organization in the car has an absolute impact on the comfort and safety of the car.In this paper,computational fluid dynamics(CFD)is used to calculate the value of the automobile air-conditioning heater and the blowing duct system.The experimental results are compared with the simulation results.After verifying the feasibility of the model,the internal flow and heat transfer of the heater are performed.Analyze and design the heater structure based on the main contradictions of new energy vehicle air conditioners: performance and energy consumption.At the same time,the internal air flow of the blowing duct system is analyzed,and an air duct optimization scheme is proposed to make the vehicle energy flow organization and the distribution of warm clothes more reasonable,so as to improve the comfort in the cabin and reduce driver fatigue.This paper uses a three-dimensional model of car air conditioners and experimental conditions provided by a car air conditioner company to conduct research in conjunction with a computer server and simulation software STAR-CCM +.The specific work and results are as follows:1)Model and simplify the car air-conditioning heater and blowing duct system separately,and use STAR-CCM + to perform grid division and numerical simulation on the car air-conditioning heater and blowing duct system,respectively.Get the flow field and temperature field values of the two models;2)Carry out experiments on the performance of automobile air-conditioning heaters and surface blowing duct systems,and compare the experimental values with the simulation values to verify the correctness of the simulation model;3)Considering the limited battery power on new energy vehicles and the precious heat source in the vehicle,a new heater fin structure was proposed,and the STAR-CCM + software was used to simulate this fin structure heater.It is most suitable to increase its overcurrent area by 1.5 times.At this time,while ensuring the heat exchange efficiency of the heater,the energy consumption caused by the pressure drop is reduced;4)Analyze the flow field and temperature field of the air in the air conditioning duct system of the automobile air conditioner.In order to make the air volume and temperature of the four air outlets uniform,an optimization scheme of adding deflectors in the air duct is proposed,and STAR-CCM + is used.The software performs orthogonal simulation tests and finds that the distance between the upper end of the left deflector and the left wall is 59.5cm,the distance between the upper end of the right deflector and the right wall is 80.5cm,and the left deflection angle is clockwise At 1 °,the air volume and temperature of each air outlet are the most even when the right deflector is deflected clockwise by 16 °. |
PDF Full Text Request