Experimental study of instability of gas-phase swirling flow in cyclone

被引：0
作者：
Song J. [1 ]
Sun L. [2 ]
Xie M. [2 ]
Wei Y. [1 ]
机构：
[1] College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing
[2] Hebei Engineering Laboratory of Fluid Measurement and Control, Hebei Petroleum University of Technology, Hebei, Chengde
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 07期
关键词：
cyclone; instability characteristics; instantaneous tangential velocity; swing frequency; swirling flow;
D O I：
10.11949/0438-1157.20220486
中图分类号：
学科分类号：
摘要：
The gas-phase swirling flow in the cyclone has strong instability, which is manifested in the eccentric swing of the rotational center of the swirling center around the geometric center, which causes the instantaneous velocity of the flow field to fluctuate with time. It is not accurate to describe the instability characteristics of this swirling flow with time averaged flow field parameters, which need to be described with dynamic flow field parameters. Therefore, the instantaneous tangential velocity in ϕ300 mm cyclone was measured by hot wire/film anemometer. The results show that the instantaneous tangential velocity is the superposition of high-frequency pulsation formed by gas turbulence and low-frequency pulsation formed by eccentric swing of swirling flow. Based on this, the formation mechanism of swing of swirling flow was discussed. The low-frequency fluctuation of instantaneous tangential velocity comes from the eccentric swing of forced vortex, and the fluctuation amplitude is proportional to the eccentricity. According to the frequency domain of instantaneous tangential velocity, the calculation model of swing frequency related to the inlet velocity, cylinder diameter and vortex finder diameter of swirling flow was established. © 2022 Chemical Industry Press. All rights reserved.
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页码：2858 / 2864
页数：6
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