车用空调进风结构的优化与进风噪音的改善

近年来,以提高乘客的舒适度为前提,对于车用空调的噪音要求越来越严格。而车用空调的主要噪音来源便是鼓风机所产生的电机噪音与气流所产生的风噪。其中,气流产生的风噪中,分为进风(吸气)噪音和出风噪音两种。文章将以进风噪音为主,着重讨论如何通过CFD分析,扫频分析,"坎贝尔"图分析,优化乘用车空调的进风结构(主要以叶轮与蜗壳之间的结构为主),以降低改善进风气流所产生的噪音。同时也作为一个设计上的经验总结来为今后的设计开发项目做一个铺垫和借鉴。

增湿管道典型结构的比较分析

介绍了水泥厂增湿管道的几种典型结构,并分析了各种结构的优缺点,在最后给出了设计时选用的原则和建议。

帅康燃气灶具的特点

家用燃气灶已从传统单一的煮食功能扩展为现代家居集装饰、品位、文化等诸多功能于一体的厨房功能性用具.无论是台式灶还是嵌入式灶,中式灶还是欧式灶,都比以往的产品更美观、更方便、更节能、更安全.

Flow Structure Around the Intake of a Vertical Pump

The flow structure around the intake of a vertical pump is investigated experimentally and numerically in order to obtain a guideline in designing the optimum shape of the intake of vertical pumps, in which their installation area is demanded to be minimum without losing the high performance. We concentrate our attention on the expansion ratio of the intake as a representative characteristic of the shape of the pumps and investigate the effect of the expansion ratio on pump performance. It is concluded that the optimum expansion ratio ranges in 1.1-1.2 if we take into consideration that the area needed for the installation of the pump should be minimum.