化工学报 ›› 2020, Vol. 71 ›› Issue (S1): 149-157.doi: 10.11949/0438-1157.20191080
Xinjun LI(),Weiwei CHEN,Shihua LU
摘要:
利用激光多普勒测振仪分别测定攻角和横流速度对压电风扇振幅的影响。基于相应的振动测试结果利用动网格技术对横流环境中不同安装角度下压电风扇冷却加热壁面的三维非定常流动和传热特性进行了数值模拟,同时应用红外热像仪对相同横流条件工况下加热表面的局部对流传热系数分布进行了测量。研究结果显示,攻角为90°时,作用在风扇上的气动载荷最小,风扇振幅最大,而随着攻角的减小风扇振幅也逐渐减小;安装角为90°时,压电风扇振动以及横流作用所诱导形成的耦合涡结构冲击加热表面,并在下游区域具有明显的脱落、破碎过程,对于叶尖包络区对应的壁面局部对流换热有显著的强化作用,此时风扇耦合换热性能最强,高于45°和135° 2倍以上;且时均对流传热系数的实验结果与数值模拟具有良好的一致性。
中图分类号:
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