过渡流下串列双圆柱周期传热机理研究  

Study of Double Periodic Cylindrical Heat Transfer Mechanism Under Tandem Transition Flow

作　　者：邹帅[1] 周杰[1] 徐加辉 喜冠南[1] 

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《机械设计与制造》2016年第8期207-210,215,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金(No.51176079);南通市传热强化与过程节能重点实验室(CP12012004)

摘　　要：主要研究过渡流状态下串列双圆柱的传热强化机理。通过基于复合网格的专用程序计算在雷诺数为200时不同间距下的工况,并分析其传热强化机理。计算结果表明:(1)上游圆柱压差阻力和黏性耗散都随着两圆柱间距增加而增强,当压差阻力的作用与黏性耗散的作用相平衡的时候,下游圆柱壁面的达到最大。(2)下圆柱前缘处传热强化的因素包括上游圆柱尾流对下游圆柱壁面的速度边界层的影响以及所携带的冷热流体对下游圆柱的温度边界层的影响。由于冷热流体流动的周期不均匀性与边界层分离点的周期转移,造成了ΔNu和ΔCf变化规律的不一致性。(3)NVP、PVP加速或抑制下游圆柱边界层的发展及分离,上游圆柱尾流所引导的冷热流体对下游圆柱壁面有周期性的洗刷作用。这是下游圆柱壁面传热强化两个重要因素。上述传热强化机理的发现,对开发设计新型小管径换热器起指导作用。A low-speed water tunnel is designed, and experimental platform of flow around circular and square cylinder is conducted. The image of flow around circular and square cylinder is obtained by using the method of particle image velocimetry. Insight 4G software can take control of the experimental process strictly. Flow field characteristics of circular and square cylinder under the condition of Reynolds number hare been revealed. Comparing the image with the existing simulation and experimental results verifies the accuracy of the particle image velocimetry and test-bed. Selects the specific Reynolds number to carry on the periodic study on cylinder, analyzing the difference and connection of the flow characteristics of circular and square cylinder.

关 键 词：过渡流 串列双圆柱 数值模拟 复合网格系统 传热强化 

分 类 号：TH16[机械工程—机械制造及自动化] TK09[动力工程及工程热物理]