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首页> 外文会议>ASME(American Society of Mechanical Engineers) Internal Combustion Engine Division Spring Technical Conference; 20060507-10; Aachen(DE) >A New Design for Inlet Diffuser of Automotive Catalytic Converter
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A New Design for Inlet Diffuser of Automotive Catalytic Converter

机译：汽车催化转化器入口扩散器的新设计

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摘要

The monolithic catalytic converter still is the main pollution control device for modern vehicles in order to reach the ever-increasing legislative demands for low emission standards. The catalytic converters require a large expansion from the exhaust pipe to the front face of the monolith. Unfortunately, packaging constraints often do not permit the use of long diffusers. Hence, flow separation within the diffuser leads to a non-uniform flow distribution across the monolith. A uniform flow distribution at the inlet monolith face is favorable for the conversion efficiency as well as the durability of the catalytic converter. Therefore the main problem is to optimize the flow distribution at the catalytic converter. It should be noted that due to flow maldistribution in an enlarged inlet of catalytic converter, some part of the monolith would be non effective. In this research a new design for inlet diffuser of catalytic converter has been proposed and fabricated. The new inlet diffuser is composed of some tube to tube cones that distribute the flow uniformly at the entrance face of monolith. Temperature, pressure drop and concentration of pollutants, before and after catalyst, have been measured. The results show that the new design for inlet diffuser tends in less uniform temperature field at the entrance of monolith but the flow distribution becomes more uniform and an increased conversion efficiency of catalyst will be obtained.
机译：整体式催化转化器仍然是现代车辆的主要污染控制设备，以满足对低排放标准日益增长的立法要求。催化转化器需要从排气管到整料的正面进行大的膨胀。不幸的是，包装限制常常不允许使用长扩散器。因此，在扩散器内的流动分离导致横跨整料的非均匀流动分布。入口整料表面处的均匀流动分布有利于转化效率以及催化转化器的耐久性。因此，主要问题是优化催化转化器处的流量分布。应该注意的是，由于在催化转化器的增大的入口中流量分配不均，整料的某些部分将无效。在这项研究中，提出并制造了催化转化器进口扩散器的新设计。新的进口扩散器由一些锥管组成，这些锥管将流量均匀地分布在整料的入口面上。测量了催化剂前后的温度，压降和污染物浓度。结果表明，新的进口扩散器设计趋于使整体入口处的温度场不均匀，但流场分布变得更均匀，从而提高了催化剂的转化效率。

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