平面气固撞击流周期振荡的模拟分析

doi:10.3969/j.issn.0438-1157.2013.06.003

化工学报 ›› 2013, Vol. 64 ›› Issue (6): 1907-1915.DOI: 10.3969/j.issn.0438-1157.2013.06.003

平面气固撞击流周期振荡的模拟分析

许宏鹏, 赵海波, 郑楚光

华中科技大学煤燃烧国家重点实验室,湖北武汉 430074

收稿日期:2012-09-18 修回日期:2013-02-21 出版日期:2013-06-05 发布日期:2013-06-05
通讯作者: 赵海波
作者简介:许宏鹏(1987—),男,博士研究生。
基金资助:
国家重点基础研究发展计划项目(201010CB227004)。

Simulation and analysis of periodical oscillation of gas-solids two-phase planar opposed jets

XU Hongpeng, ZHAO Haibo, ZHENG Chuguang

State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China

Received:2012-09-18 Revised:2013-02-21 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Basic Research Program of China(201010CB227004).

摘要/Abstract

摘要： 由于喷嘴截面的高宽比远小于1,平面狭缝喷嘴撞击流可看作二维撞击流。采用欧拉双流体模型对二维气固撞击流进行数值模拟。模拟结果表明,当固相负载率m≤8.2,颗粒粒径为60 μm≤d_p≤175 μm时,大间距的平面气固撞击流也出现了周期振荡。通过分析射流轴线上不同位置的压力和速度的瞬时值和平均值,认为周期振荡是由于撞击面上压力释放和持续射流的共同作用导致。讨论了不同条件对振荡周期的影响:振荡周期随喷嘴间距或颗粒粒径的增加而增加;而随射流Reynolds数的增加或者固相负载率的增加而减小。

关键词: 平面气固撞击流, 双流体模型, 振荡周期, 流场形态

Abstract: As the ratio of height-to-width of planar nozzle is less than 1, the planar opposed jets are regarded as two-dimensional impinging streams.A numerical study of gas-solids two-phase planar opposed jets was conducted by using two-fluid model (TFM).It was concluded that periodical oscillation was the main flow regime for large nozzle separation with ratio of particle-to-gas mass flow m≤8.2, particle diameter 60 μm≤d_p≤175 μm and ratio of nozzle separation (L) to nozzle height (H) 12—20.This oscillation was resulted from pressure release on the impinging surface and the inertia of incessant axial jets, which was based on the instantaneous and mean distributions of static pressure and velocity at the jet axis.The effects of different simulation conditions on oscillation period were discussed.The period would be increased by enlarging nozzle separation or increasing particle diameters, while the period would be decreased by increasing jet Reynolds number or ratio of particle-to-gas mass flow.

Key words: planar gas-particle two-phase impinging flow, two fluids model, oscillation period, flow regime

中图分类号:

TQ021.1

许宏鹏, 赵海波, 郑楚光. 平面气固撞击流周期振荡的模拟分析[J]. 化工学报, 2013, 64(6): 1907-1915.

XU Hongpeng, ZHAO Haibo, ZHENG Chuguang. Simulation and analysis of periodical oscillation of gas-solids two-phase planar opposed jets[J]. CIESC Journal, 2013, 64(6): 1907-1915.

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平面气固撞击流周期振荡的模拟分析

Simulation and analysis of periodical oscillation of gas-solids two-phase planar opposed jets

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