Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (5): 856-862.

Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode

徐聪

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

收稿日期:2011-05-20 修回日期:2012-03-04 出版日期:2012-10-28 发布日期:2012-11-06
通讯作者: XU Cong,E-mail:c-xu@mail.tsinghua.edu.cn

Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode

XU Cong

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

Received:2011-05-20 Revised:2012-03-04 Online:2012-10-28 Published:2012-11-06

摘要/Abstract

摘要： The reverse flow diverter (RFD) consisting of a nozzle and a diffuser is a key component in pneumatic pulse jet pumps. We investigated the effects of suction gap and diffuser configurations on RFD performance during the reverse flow mode. Three suction gap configurations were examined: (1) an axisymmetrical cylinder, (2) a cuboid whose bottom plane had no half-circle groove and was level with the diffuser entrance lower border, and (3) a cuboid with a half-circle groove on the bottom plane. Among them, the second one resulted in the highest RFD pumping capacity. The effect of receiver presence before the diffuser was also examined. RFD pumping efficiency was found to be enhanced in the presence of a receiver before the diffuser when the suction gap length is small and the jet outlet velocity at the nozzle exit is high enough. Based on experimental data, a dimensionless performance curve of the suction factor q versus the ratio of Euler numbers in sections out-out and 0-0 Eu_out/Eu₀ was derived. This curve is insensitive to suction gap configurations.

关键词: reverse flow diverter, suction gap, receiver, nozzle area ratio, reverse flow mode

Abstract: The reverse flow diverter (RFD) consisting of a nozzle and a diffuser is a key component in pneumatic pulse jet pumps. We investigated the effects of suction gap and diffuser configurations on RFD performance during the reverse flow mode. Three suction gap configurations were examined: (1) an axisymmetrical cylinder, (2) a cuboid whose bottom plane had no half-circle groove and was level with the diffuser entrance lower border, and (3) a cuboid with a half-circle groove on the bottom plane. Among them, the second one resulted in the highest RFD pumping capacity. The effect of receiver presence before the diffuser was also examined. RFD pumping efficiency was found to be enhanced in the presence of a receiver before the diffuser when the suction gap length is small and the jet outlet velocity at the nozzle exit is high enough. Based on experimental data, a dimensionless performance curve of the suction factor q versus the ratio of Euler numbers in sections out-out and 0-0 Eu_out/Eu₀ was derived. This curve is insensitive to suction gap configurations.

Key words: reverse flow diverter, suction gap, receiver, nozzle area ratio, reverse flow mode

徐聪. Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode[J]. Chinese Journal of Chemical Engineering, 2012, 20(5): 856-862.

XU Cong. Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode[J]. Chin.J.Chem.Eng., 2012, 20(5): 856-862.

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Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode

Effects of Geometric Configurations on the Performance of Reverse Flow Diverters in Reverse Flow Mode

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