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投稿时间：2008-01-06
投稿时间：2008-01-06
中文摘要: 在考虑壁面热效应的情况下,当雷诺数为0.6×104~5.0×104,分别对管径比为0.4和0.24两种工况下的柱体尾迹旋涡脱落的流动情况进行实验.结果表明:加热使得旋涡流动发生明显变化,其影响表现在旋涡脱落信号傅里叶变换峰值的改变上;这种影响随雷诺数的变化有一临界值ReL,加热在ReL两侧对旋涡所起作用相反,并且ReL随管径比的不同而不同.通过对不同管径比工况的分析比较,发现同等加热强度下小管径比的壁面热效应对旋涡流动影响更明显.
Abstract:The effect of heating on vortex shedding induced by liquid flowing across a cylinder fixed in the cross section of a tube is studied. Experiments are carried out at d/D=0.4 and 0.24 (ratio of cylinder diameterd to inside diameter D of tube under the congdision Re=0.6×104~5.0×104). Results of experiments show a certain influence of heating of the cylinder on vortex shedding, which is reflected by the changes of acquired peak values. The effects of heating, ReL and d/D on the peak values are analyzed. The critical number ReL at different d/D rations is obtained. Investigations in this field are very useful for design and running securely in heat exchangers.
keywords: vortex shedding heat exchanger heat effect
文章编号：20080107 中图分类号： 文献标志码：
基金项目:上海市自然科学基金项目(04ZR14076);上海市教委重点资助项目(05ZZ55);上海市重点学科建设项目(P1302)
引用文本：
张丽华,李永光,吕欣欣.两种管径比的绕流热柱体旋涡信号比较[J].上海电力大学学报,2008,24(1):23-25.
ZHANG Li-hua,LI Yong-guang,LV Xin-xin.The Comparition of Vortex Signal Behind Heated Cylinder in Liquid Cross Flow[J].Journal of Shanghai University of Electric Power,2008,24(1):23-25.
张丽华,李永光,吕欣欣.两种管径比的绕流热柱体旋涡信号比较[J].上海电力大学学报,2008,24(1):23-25.
ZHANG Li-hua,LI Yong-guang,LV Xin-xin.The Comparition of Vortex Signal Behind Heated Cylinder in Liquid Cross Flow[J].Journal of Shanghai University of Electric Power,2008,24(1):23-25.