车用热交换器设计中的CAE技术

CAE技术(Compufe Aided Engjneering)是计算机技术和工程分析技术相结合形成的新兴技术。应用CAE技术设计人员可在产品设计前期便发现设计缺陷并加以修改,避免了产品设计完成后性能不达标、延误开发周期、产品成本高居不下的局面。     

CO2轿车空调降温性能试验研究

介绍了国内第一台配置CO2空调系统的桑塔纳轿车在环境模拟实验室和道路行驶时空调效果的测试结果,该制冷系统采用铜管铝片式换热器,其尺寸与原HFC134 a系统基本一致,压缩机采用斜盘活塞式,节流机构采用手动控制开度的电子膨胀阀。试验表明此空调器基本能满足降温的需要,但零部件的性能需要改善。     

二甲醚用作汽车空调制冷剂的实验研究

根据二甲醚的热物理性质对二甲醚的制冷循环性能进行了分析,并在R134 a汽车空调系统上对二甲醚的制冷性能进行了测试。结果表明:由于二甲醚的气相和液相黏度都比较小,使用二甲醚作为制冷剂可以减小系统的阻力,有利于系统制冷性能的提高。二甲醚可以直接灌注式替代R134 a,但会造成蒸发器出口过热度降低,需对膨胀阀弹簧预紧力进行调整,才能充分发挥二甲醚的制冷性能。     

NUMERICAL AND EXPERIMENTAL STUDY OF THERMAL DISTRIBUTION INSIDE AIR-CONDITIONED AUTOMOBILE CHAMBER

ＤＩＳＴＲＩＢＵＴＩＯＮ ＩＮＳＩＤＥ ＡＩＲ－ＣＯＮＤＩＴＩＯＮＥＤ ＡＵＴＯＭＯＢＩＬＥ ＣＨＡＭＢＥＲTX＠童灵＠陈芝久＠阙雄才ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｒａｐｉｄｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅａｕｔｏｍｏｂｉｌｅｉｎｄｕｓｔｒｙ，ｃｕｓ...     

Geometry Modeling of an Electronic Expansion Valve Head

This paper proposed that the flow characteristic of electronic expansion valve should be adapted to the evaporator superheat gain to refrigerant flow rate under different working conditions. Two native methods of geometry modeling of electronic expansion valve head were introduced. By analysis of them, some shortcoming was detected and a universal modeling method of electronic expansion valve head was put forward. Through this model, the flow characteristic of EEV and the influence factors can be investigated more deeply.     

轿车空调微机控制系统研究

本文介绍了一般轿车空调器针对舒适性要求所采用的控制方式和手段，并制作了以通用汽车公司某型轿车为实验对象的单片机控制系统，同时对控制策略作了深入研究，为轿车空调热舒适性控制提供一些方法。     

汽车空调系统与发动机冷却系统的耦合分析

建立汽车空调系统与发动机冷却系统数学模型,对两系统进行耦合计算,与实验结果对比表明:仿真与实验结果吻合较好,能够满足工程设计的需要。     

Numerical Analysis and Comparison of the Fan Ducted Discharge Equipment Acoustics

In order to cut down excessive experiments, acoustic response of the different fan ducted discharge equipment was studied based on numerical method. The sound pressure level(SPL) in each component of a ductplenum-reverberant room model was drawn and SPL deviation was analyzed. The trends of the curves were explained by the diffracti on and end reflection at the duct discharge. Models with different room dimensions, duct lengths, duct cross sections, duct locations and duct elbow were constructed, and their response was analyzed and compared. The results show that the SPL curves are smooth in the duct discharge cross section, but seriously fluctuant in the reverberant rooms SPL in the duct discharge is only sensitive to duct dimensions, while that of the reverberant room is regularly influenced by all the dimension and arrangement factors. Small room and short duct help to increase room SPL. Elbow has an indistinct influence on all the components‘ sound field. Finally, suggestion to reduce the deviation of experiment results was proposed.     

汽车空调压缩机变排量控制阀理论与实验研究

本文针对某种安装在汽车空调系统变排量压缩机上的电动控制阀进行了仿真和实验研究，并得到了较为满意结果，为今后汽车空调变排量的电动控制研究提供了积极的指导意义。     

二氧化碳汽车空调系统的动态仿真

文章建立了跨临界CO2汽车空调系统的动态仿真模型。利用移动边界法和平均空泡系数法对蒸发器建立了集总参数模型;利用移动边界法对气冷器和中间换热器分别建立了集总参数模型;由于压缩机和节流阀的热惯性较小,利用经验公式对其建立了稳态模型。计算结果同实验数据的比较表明,该动态模型比较准确地体现系统实际的动态性能。