基于CFD-DEM模拟的脉冲射流对水平气固两相流影响研究  

Effects of Pulsed Jets on Horizontal Gas-Solid Two-Phase Flow Based on CFD-DEM Simulation

作　　者：胡靖 张丹[1] 贝绍轶[1] 杨军 杨育飞 郑焱[1] HU Jing;ZHANG Dan;BEI Shaoyi;YANG Jun;YANG Yufei;ZHENG Yan(School of Automotive and Trffic Engineering,Jiangsu University of Technology,Changzhou Jiangsu 23001,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,江苏常州213001

出　　处：《昆明理工大学学报（自然科学版）》2023年第4期153-162,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(11802108);江苏省高校自然科学基金重大项目(19KJA510002);常州市应用基础研究项目(CJ20220066);非定常空气动力学与流动控制工信部重点实验室开放课题(KLUAFC-E-202102);江苏理工学院研究生实践创新计划(XSJCX21_2)。

摘　　要：使用耦合流体计算动力学和离散相模型的方法,对加装脉冲式射流发生器的水平管道两相流动进行数值模拟,通过改变空气输送速度以及射流频率研究颗粒的运动.结果表明,在使用脉冲射流时,颗粒运输速度显著提升,颗粒由连续底部流动变为具有一定规律性的颗粒群流动,运输系统的能量转换率显著提高.随着射流频率的增大,颗粒群的数量也随之增加.针对颗粒波动速度的频谱分析和时频特性分析表明,射流促进了颗粒在管道内运动准周期性,并发现射流频率与原管道粒子波动速度的主导频率一致时,可以最大限度提高颗粒输送效率.A pulsed nozzle jet is added to a pipeline to improve the efficiency of horizontal pneumatic conveying.The particle dynamics are evaluated by a coupled fluid computational dynamics and discrete phase model ap-proach.The particle motions are investigated by varying the conveying velocity and the jet frequency of the noz-zle.The results show that when the pulsed jet is used,both the particle velocity and the energy efficiency increasesignificantly,and the particles change from continuous botom flow to regular particle group flow.With the in-crease of jet frequency,the number of particle groups also increases.The power spectra and time-frequency ana-lyses of particle fluctuation velocity show that the jet promotes the periodicity of particle movement in the pipe.When the jet frequency is consistent with the dominant frequency of particle fluctuation velocity in the originalpipe,the paricle conveying efficiency can be maximized.

关 键 词：脉冲射流 气固两相流 数值模拟 功率谱 连续小波变换 

分 类 号：O359[理学—流体力学]