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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >On a Novel Diffuser for Efficient Automotive Catalytic Converters
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On a Novel Diffuser for Efficient Automotive Catalytic Converters

机译：新型用于高效汽车催化转化器的扩散器

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摘要

In automobile-exhaust systems, catalytic converters are main components and produce substantial pressure drops, which induce engine-power loss and fuel-consumption rise. On the other hand, catalytic converters are required for the uniformity of flow through a catalytic substrate, which causes uniformity of thermal distribution and high catalytic-conversion efficiency. The purpose of this study is to reduce the pressure losses and to improve the flow distribution simultaneously, under spatial constraints. The authors propose a new type of device and show its performance experimentally. Namely, the authors place a dome as a flow deflector inside the diffuser in front of a catalyst in order to suppress flow separation. The converter tested in the present study has a standard cylindrical ceramic substrate with a circular cross section. As a result, we present the optimum dome geometry that can reduce the pressure loss by 22% as compared to a no-dome converter.
机译：在汽车排气系统中，催化转化器是主要部件，会产生很大的压降，从而导致发动机功率损失和燃油消耗增加。另一方面，为了使流过催化基质的流量均匀，需要催化转化器，这导致热分布均匀和高催化转化效率。这项研究的目的是在空间限制下减少压力损失并同时改善流量分布。作者提出了一种新型设备，并通过实验展示了其性能。即，为了抑制流分离，作者将圆顶作为导流器放置在扩散器内部的催化剂之前。在本研究中测试的转换器具有带有圆形横截面的标准圆柱形陶瓷基板。因此，与无球阀转换器相比，我们提供了最佳的圆顶几何形状，可以将压力损失降低22％。

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