流体机械

2020, v.48;No.576(06) 1-5+13

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螺旋板式热交换器传热与流动特性试验研究
Experiment Research on Heat Transfer and Flow Characters of Spiral Heat Exchanger

李雪;陈永东;刘孝根;张明然;
Li Xue;Chen Yongdong;Liu Xiaogen;Zhang Mingran;Heat Transfer Technology And Equipment Branch,Hefei General Machinery Research Institute;

摘要(Abstract):

基于理论分析,设计并制造了4台典型结构的螺旋板式热交换器。通过试验研究了关键结构参数当量直径d_e、定距柱密度n,冷流体进口温度T对螺旋板式热交换器传热与流动特性的影响规律。结果表明:换热面积相近的样机,当量直径由19.7增至37.9时,总传热系数相对增加9%,平均压力降相对降低45%;定距柱密度由200增至800时,总传热系数相对增加17%,平均压力降相对增加129%;冷流体进口温度的提高既可使流体之间的传热效果增强,又能减小流体流动的阻力。基于试验数据对湍流状态下螺旋流的对流换热系数和压力降的准则式分别进行了拟合及验证,对流换热系数拟合公式的平均相对误差为5.4%,压力降拟合公式的平均相对误差为6.3%,为螺旋板式热交换器的能效评价奠定了基础。
Four typical spiral heat exchangers are designed and fabricated based on theoretical analysis.The effect laws of key structure parameter that equivalent diameter de and spacing column density n and cold fluid temperature at inlet T on the heat transfer and flow characters of spiral heat exchanger are researched by series experiments.Experimental results show that the overall heat transfer convection coefficient increases 9% and pressure drop decreases 45% when de increases from 19.7 to 37.9.The overall heat transfer convection coefficient increases 17% and pressure drop increases 129% when n increases from 200 to 800.The high cold fluid temperature at inlet can promote heat transfer and reduce pressure drop.The heat transfer convection coefficient and pressure drop computational formula is obtained by fitting with experiment values.The predicted value of fitting formula is close to?the?true?value while the average relative error between predicted value and true value of heat transfer convection coefficient is 5.4% and that of pressure drop is 6.3%。The result can provide significant guidance to energy efficiency evaluation of spiral heat exchanger.

关键词(KeyWords): 螺旋板式热交换器;传热;流动;准则式;能效评价
spiral heat exchanger;heat transfer;flow;computational formula;energy efficiency evaluation

Abstract:

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基金项目(Foundation): 国家重点研发计划项目(2017YFF0209802)

作者(Author): 李雪;陈永东;刘孝根;张明然;
Li Xue;Chen Yongdong;Liu Xiaogen;Zhang Mingran;Heat Transfer Technology And Equipment Branch,Hefei General Machinery Research Institute;

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