Simulation of air leakage characteristics of rotary valve pneumatic conveying

  • WANG Yong-liang ,
  • PENG Si-peng ,
  • WANG Yi ,
  • LI Shi-hao ,
  • LIU Yu-long
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  • (1. Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China; 2. Qingdao Soft Control Co., Ltd., Qingdao 266590, China)

Received date: 2020-08-28

  Revised date: 2020-11-11

  Online published: 2020-11-11

Abstract

In order to analyze the air leakage characteristics and flow field variation law of rotary valve pneumatic conveying system, based on FLUENT software, the two- dimensional and three-dimensional models of rotary valve pneumatic conveying system were established by using unsteady calculation, and numerical simulation of a rotary valve pneumatic conveying system under pure air supply condition was carried out. The pressure distribution and air leakage of rotary valve pneumatic conveying system at different times were studied, and the variation law of air leakage of two-dimensional and three-dimensional calculation models was compared. The influence of tip clearance and pressure difference between inlet and outlet  on gas leakage of rotary valve was obtained. Compared with the experimental results, the gas leakage rate of rotary valve  under different pressure difference obtained by numerical calculation shows that the maximum relative error is 12.2%, and the average relative error is 8.7%. The results show that the gas leakage rate of two-dimensional and three-dimensional models has the same trend with rotation time, and the average deviation of the two models is 9.8%.The average air leakage of the rotary valve and the instantaneous air leakage of the high-pressure chamber increase linearly with the pressure difference between the inlet and the outlet, while the instantaneous air leakage of the high-pressure chamber of the rotary valve changes little with the size of tip clearance, and the average air leakage of the rotary valve increases exponentially with the tip clearance.

Cite this article

WANG Yong-liang , PENG Si-peng , WANG Yi , LI Shi-hao , LIU Yu-long . Simulation of air leakage characteristics of rotary valve pneumatic conveying[J]. Journal of Dalian Maritime University, 2021 , 47(1) : 111 -118 . DOI: 10.16411/j.cnki.issn1006-7736.2021.01.013

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