【作者】 王鑫；

【导师】 饶柱石； 祝彦寿；

【作者基本信息】 上海交通大学 ， 车辆工程（专业学位）， 2017， 硕士

【摘要】 随着汽车的普及,汽车的安全性和舒适性变得越来越重要,其中影响到安全性的除霜性能和乘坐舒适性的噪声性能是目前炙手可热的课题。本文中以某微客车型作为研究对象,通过数值模拟计算,对其除霜性能和噪声性能进行分析,再对除霜系统中的除霜风道结构不合理的地方进行局部优化改进,最终使其能够满足设计要求。首先,采用Catia软件对整车模型进行建模,再用Fluent软件对其进行稳态和瞬态的模拟计算,得到反映除霜性能的前挡风玻璃的速度场分布、温度场分布和霜层变化等结果,以及反映影响噪声性能的除霜风道的噪声声压级分布结果。对上述结果进行分析,发现客车噪声效果表现得比较好,但除霜效果有待改进。本文在提高客车除霜性能和噪声性能时只考虑入口风速和除霜风道结构,不考虑进风口温度、格栅和入射角等其他因素。通过稳态模拟计算,对不同初始速度下得到的风挡表面速度分布结果和除霜风道噪声声压级分布结果进行比对,选择出合适的除霜风道入口气流速度。针对原客车除霜系统除霜效果不好的问题,基于影响汽车除霜性能和噪声性能共同的结构因素,优化改进除霜风道结构,达到除霜性能和噪声性能的要求。更多还原

【Abstract】 With the popularization of the car,safety and comfort of cars are becoming more and more important.The defrosting performance of the car which affects the driving safety and noise performance of the car which affects the ride comfort are hot topics in now days.In this paper,a micro passenger car is the research object,through the result of numerical simulation,analyzed the defrosting performance and noise performance,and then optimized the defrosting duct structure of defrosting system.Ultimately,it could be meet the design standard.Firstly,established the vehicle model with CATIA software,then implemented the steady-state and transient simulation calculation with Fluent software.We got the results of the air velocity distribution,temperature distribution and the frost layer thickness change on the front windshield which reflect the defrosting performance,and the result of defrosting duct noise sound pressure distribution which reflect the noise performance.Through analyzed the above results,it shows that the defrosting performance of this passenger car need to improve while the noise effect is good.In this paper,the inlet air velocity and the structure of the defrosting duct are the only considered factors when improve the defrosting performance and noise performance,other factors such as the inlet air temperature,the grating and the jet angle are not considered.Through the steady state simulation,compared with the results of the air velocity distribution on the front windshield and the result of defrosting duct noise sound pressure distribution under different initial inlet velocities,to choose the suitable defrosting duct inlet velocity.To the unqualified defrosting performance problem,modified the defrosting duct based on the common structure factors which affect the passenger car defrosting performance and noise performance.Finally the results can meet the defrosting performance and noise performance requirements.更多还原