To improve the performance of the enhanced cyclone with shunt device (ECSD), the vortex finder lengths optimization for the ECSD is carried out by numerical investigation. Reynolds stress model and discrete phase model are adopted. The results show that the separation ability of the ECSD can be improved by longer vortex finder, which is contrary to the generally accepted conclusion that the vortex finder length of the traditional cyclone should not be longer than cylindrical section length. When the ratio of vortex finder length to cylindrical section length reaches 1.5 (225 mm vortex finder), the total separation efficiency, reduced separation efficiency and comprehensive separation efficiency are 90.7%, 89.7%, and 80.6%, respectively, which are the highest. The tangential velocity distribution is one of the most important reasons that the separation efficiency increases with the increase of the vortex finder length in general. The tangential velocity in the conical section of the ECSD increased with the increase of vortex finder length. When the length of vortex finder is the same as that of cylindrical section, the overall energy consumption and split ratio of the ECSD are the largest of 1.88 kPa and 12.4%, respectively, which is detrimental to the overall performance of ECSD.

为了提高带分流装置的增强型旋风分离器（ECSD）的性能，通过数值研究对ECSD的涡流探测器长度进行了优化。采用雷诺应力模型和离散相模型。结果表明，较长的涡流器可以提高ECSD的分离能力，这与传统旋流器的涡流器长度不应大于圆柱截面长度的普遍接受的结论相反。当涡流器长度与圆柱截面长度之比达到1.5（225 mm涡流器）时，总分离效率、缩减分离效率和综合分离效率分别为90.7%、89.7%和80.6%，均最高。一般而言，切向速度分布是分离效率随着涡流器长度的增加而增加的最重要原因之一。ECSD锥形截面的切向速度随着涡流探测器长度的增加而增加。当涡流器的长度与圆柱截面长度相同时，ECSD的总能耗和分流比最大，分别为1.88 kPa和12.4%，不利于ECSD的整体性能。