It was found that there are lower pressure drop and better distribution in the radically variable cell diameter converter and the inlet loss of catalytic converter may be neglected when the velocity in cell passage is low 结果发现，三效催化器微元通道孔径沿径向的不同组合可以达到既不增加压降、流速分布又均匀的效果，而且在所计算的轴对称三效催化器结构中，在通常的流量范围内其进口损失可以忽略。
