针对换热器在高雷诺数下的结构强度问题
本文基于低流阻、高传热的球型结构提出一种新型的圆台扰流结构
并将其应用于交叉流换热器中。采用实验和数值模拟相结合的方法对圆台扰流换热器开展了研究
分析了雷诺数(Re=4 772~38 181)、温比(T
h
/T
c
=4~9)和流速比(V
h
/V
c
=0.5~4)对该换热器的流动性能、传热性能和不可逆损失的影响规律;通过数值计算对换热器冷气侧通道的流动和传热机理进行了分析
最后基于实验结果拟合了传热关联式。研究表明:圆台凸起的迎风面受到气流的冲击作用有较高的换热系数
而圆台凹坑在尾部呈现出较好的换热效果
雷诺数的增大会增加上述高换热区域的面积。在研究参数范围内
增大雷诺数使得换热器冷气侧通道的努塞尔数和摩擦系数较光滑圆管分别提高了1.67~2.13倍和5.13~12.16倍;温比和流速比对冷气侧通道内的流动和传热影响都较小。不可逆损失随着温比的增大而增大
但当雷诺数增大时
不可逆损失会有所降低;当流速比为2时
不可逆损失达到了极小值。拟合得到的准则式与实验结果较为吻合。本文研究结果可为未来先进空气换热器的结构设计提供参考和借鉴。
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