中文摘要：

基于压电风扇运动规律的激光多普勒测振仪测试结果,利用动网格技术对单个垂直壁面压电风扇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表面局部对流换热系数分布进行了测量。研究结果表明：时均对流换热系数的数值模拟与实验结果具有良好的一致性;加热表面的存在,导致压电风扇激励的涡系结构与其在自由空间振动时诱导的流场存在一定的差异,脱落涡相比于自由空间时更易于破碎;压电风扇振动诱导的涡冲击加热表面所形成的近壁流动呈现出明显的平行于风扇的侧向流动,而在压电风扇两侧边则出现卷吸的特点,叶尖包络区对应的壁面局部对流换热有显著的强化作用,表面对流换热系数分布在包络区外围呈现出明显的哑铃状特征。

英文摘要：

A numerical simulation of the three-dimensional unsteady flow and heat transfer characteristics of a single piezoelectric fan arranged normally to the heated surface is performed using dynamic meshing scheme.The displacement of the vibrating fan is determined from the vibration test by using the laser doppler vibrameter.An experimental test for the distribution of the local convective heat transfer coefficient is also made using the infrared camera.The distribution of the cycle-averaged local heat transfer coefficient obtained by the numerical simulation is found to be in good consistence with the test result.Due to the existence of the heated surface,the vortical structures excited by the piezoelectric fan behave somewhat differently from those observed in the free space.The shedding vortex is easier to be broken down in relation to the case in the free space.The near-wall flow field induced by the piezoelectric fan demonstrates obvious lateral flow parallel to the fan,and suction flow on both sides of the fan.The local convective heat transfer in the fan-tip vibration envelope is effectively enhanced.Dumbbell-shaped distribution of local convective heat transfer around the fan-tip vibration envelope is demonstrated.