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热力发电  2015 

缩放椭圆管结垢对换热场协同的影响

, PP. 31-35

Keywords: 缩放椭圆管,速度场,温度场,场协同数,协同角,污垢厚度

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Abstract:

针对结垢厚度分别为0.5、1.0、1.5、2.0mm的圆管及交叉缩放椭圆管进行数值模拟,分析在雷诺数re分别为10000、12000、18000、24000、30000的流动状态下,污垢对速度场和温度场及其协同角、协同数的影响,并对圆管及交叉缩放椭圆管进行比较。结果表明:交叉椭圆管内场协同数随着re的增加而减小,随着污垢厚度的增加而增大,而平均协同角则相反;沿管长方向场协同数逐渐减小,对于每个过渡段,场协同数有2次最大峰值和2次最小峰值;交叉缩放椭圆管的平均场协同数大于圆管,平均协同角小于圆管。

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