匀速流体横掠管束的流场数值模拟  

Numerical simulation of uneven entry velocity distribution gas flowing across different arrayed tube bundles

作　　者：潘维[1] 池作和[1] 斯东波[1] 岑可法[1] 

机构地区：[1]浙江大学热能工程研究所能源清洁利用与环境教育部重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第8期1043-1046,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家重点基础研究发展规划资助项目(G199902220403);全国优秀博士论文专项基金资助项目.

摘　　要：采用标准k ε模型对速度分布不均匀气体流经顺排和错排管束的流场进行了计算机数值模拟,SIMPLE算法求解速度场和压力场的耦合,方程离散采用二阶上风格式,管箱进口处气体速度假设符合二次曲线分布,研究不同排列方式管束对气流的影响.结果表明,对于顺排管束,经过5排管子,流速就可达到比较均匀;对于错排管束,由于对流体的扰动加强,只要经过4排管子,流速就趋于均匀;当管束的横向和纵向节距变大时,对流体的扰动减弱,气流需要经过更多排管束,速度才能达到均匀;在管箱顶部和底部,由于流体速度高,管束容易被磨损.Numerical simulation of uneven velocity gas flowing across different array tube bundles was conducted. Stand k-ε model and SIMPLE method were used. Equation discrete method is second order upper wind. At tube bank entrance gas velocity distribution follows a quadric curve. Simulation results showed that different arrayed tube bundles have great impact on gas flow. For line tubes gas main velocity was (even) after about five rows, but for cross tubes only after five rows of tubes. If pitches between tubes become larger, because tube disturbance on gas is weakened, velocity may become even after more rows of tubes. Near by bottom and top of the tube bank, because of the smaller resistance, velocity is higher.

关 键 词：管束 数值计算 磨损 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]