强声波作用下烟气中滑移单颗粒煤粉传热传质特性

doi:10.19596/j.cnki.1001-246x.7656

计算物理 ›› 2018, Vol. 35 ›› Issue (3): 303-312.DOI: 10.19596/j.cnki.1001-246x.7656

强声波作用下烟气中滑移单颗粒煤粉传热传质特性

许伟龙^1,2, 姜根山², 安连锁¹, 刘月超^1,2

1. 华北电力大学能源动力与机械工程学院, 北京 102206;
2. 华北电力大学数理系, 河北保定 071003

收稿日期:2017-03-13 修回日期:2017-07-18 出版日期:2018-05-25 发布日期:2018-05-25
通讯作者: 姜根山,教授,博士生导师,研究方向:炉内声学理论及应用,E-mail:gsjiang@ncepu.edu.cn
作者简介:许伟龙,博士研究生,主要研究方向:声波在炉内的传播特性及声效应,E-mail:xuweilong@ncepu.edu.cn
基金资助:
国家自然科学基金（11474091，11674093，11274111）资助项目

Heat and Mass Transfer Characteristics Around Slip Single Coal Particle in Flue Gas in High Intensity Sound Field

XU Weilong^1,2, JIANG Genshan², AN Liansuo¹, LIU Yuechao^1,2

1. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;
2. School of Mathematics and Physics, North China Electric Power University, Baoding 071003, Hebei Province, China

Received:2017-03-13 Revised:2017-07-18 Online:2018-05-25 Published:2018-05-25

摘要/Abstract

摘要： 根据二维轴对称、非稳态，层流的质量、动量和能量守恒方程，研究强声波作用下烟气中滑移单颗粒煤粉的传热传质特性，颗粒与烟气之间有稳定的滑移速度.分析声压级范围为150 dB~170 dB，可听声频率范围内，及在声质点速度与滑移速度的不同速率比情况下，颗粒局部努赛尔数、表面平均努赛尔数以及时间-空间平均努赛尔数的分布规律.在可听声频率范围内，存在极值频率，此时煤颗粒表面的传热传质效果最佳.为强声波应用于电站锅炉中、强化煤颗粒燃烧提供理论基础.

关键词: 强声波, 局部努赛尔数, 表面平均努赛尔数, 时间-空间平均努赛尔数, 滑移速度

Abstract: To study heat and mass transfer around pulverized coal particle under high intensity acoustic field with superposed steady component, two-dimensional, unsteady, laminar conservation equations for mass, momentum and energy transport in flue gas phase of power plant boiler were developed. Local Nusselt, space-averaged Nusselt and space- and time-averaged Nusselt numbers around coal particles, as functions of sound pressure level, frequency and ratio of acoustic velocity to steady slip velocity between particles and main flow, were discussed. There exists extremum frequency in which heat and mass transfer effect is the best in the range of audible sound frequency. It highlights a good application prospect in combustion for boiler.

Key words: high intensity sound, local Nusselt number, space-averaged Nusselt number, space- and time-averaged Nusselt number, steady slip velocity

中图分类号:

TK224.1

许伟龙, 姜根山, 安连锁, 刘月超. 强声波作用下烟气中滑移单颗粒煤粉传热传质特性[J]. 计算物理, 2018, 35(3): 303-312.

XU Weilong, JIANG Genshan, AN Liansuo, LIU Yuechao. Heat and Mass Transfer Characteristics Around Slip Single Coal Particle in Flue Gas in High Intensity Sound Field[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2018, 35(3): 303-312.

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强声波作用下烟气中滑移单颗粒煤粉传热传质特性

Heat and Mass Transfer Characteristics Around Slip Single Coal Particle in Flue Gas in High Intensity Sound Field

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