百叶窗浓缩器内流场特性的实验及数值模拟研究(英文)  

Experimental Study and Numerical Simulation of the Single- phase Flow Field in a Louver Coal Concentrator

作　　者：管晓艳[1] 董智广[1] 程道来[1] 

机构地区：[1]上海应用技术学院城市建设与安全工程学院,上海201418

出　　处：《科学技术与工程》2014年第13期49-56,70,共9页Science Technology and Engineering

基　　金：上海高校青年教师培养计划项目(405ZK12YQ06)资助

摘　　要：为研究百叶窗煤粉浓缩器(LCC)的气固分离机理,对LCC内单相流场进行了实验和数值模拟研究。在二维LCC实验台上采用恒温热线风速仪测量了平均速度和脉动速度。应用FLUENT软件对LCC内的流场进行模拟,湍流模型包括标准k-ε模型、可实现k-ε模型、RNG k-ε模型和雷诺应力模型(RSM)四种。对比数值模拟结果和实验结果发现,四种湍流模型预报LCC内平均速度均与实验结果有较好的一致性,但在预报湍流动能方面,只有可实现k-ε模型和RSM模型给出了合理的预报。数值模拟结果表明:LCC内叶片背面和分流挡板的迎风侧存在旋涡;叶片对LCC内流场影响较显著的范围在距离叶片10mm位置处;当叶片倾角大于31°时,叶片上游更多的气流被分离下来,并且分离点距叶片前端的距离随着叶片倾角的增加近似呈线性增加的趋势。The sing-phase flow field was investigated both experimentally and numerically to study the gas/solid separation mechanism in a louver coal concentrator （LCC）. First, the mean and fluctuating velocities of the air were measured using a constant temperature hot-wire anemometer in a small-scale 2-D LCC model. Then those velocities were simulated by the standard k-ε, realizable k-ε, RNG k-ε and Reynolds-stresses models （RSM） with FLUENT. Comparison between the numerical results and the experimental data shows that all four turbulence models can predict the average velocity pretty good, but only the realizable k-ε model and RSM can give reasonable prediction of the turbulence kinetic energy. Vortices appear at the back of the blade and the upwind side of the division plate in the LCC. The influence of the blade on the air velocity reaches its maximal value in the cross section L=10 mm away from them. More air upstream of the blade is separated by the blade when the blade obliquity is greater than 31°, and the distance between the blade front tip and the division point increases almost linearly with the blade obliquity.

关 键 词：燃烧 燃料 分离 流动 模拟 湍流 

分 类 号：TK16[动力工程及工程热物理—热能工程]