This paper aims at performing an investigation numerically on the turbulent flow and thermal performances for an asymmetrical concave surface integrated with a slim vibrating piezoelectric fan. The dynamic mesh technique using a user defined function to describe the displacement function of vibrating cantilever beam is employed to model the deformation of the slim piezoelectric fan in time. Meanwhile, the SST k-ω turbulence model is chosen to capture the turbulence behavior of the flow and heat transfer. Two important factors, the relative curvature of the both sides of semicircular surfaces (RK) and the dimensionless distance of fan offset along y-axis (Δy/A_PP) are taken into considerations during the simulation process. A considerable increase of local time-average heat transfer coefficients is observed in the vicinity of vibration envelope. The results show that the relative curvature (RK) has a strong influence on the flow and heat transfer at both ends of the asymmetrical concave surface when its value is larger than 2. And by adjusting the dimensionless offset distance of the piezoelectric fan (Δy/A_PP), the area-averaged convective heat transfer coefficient can be increased by 20% on a small zone surrounding the fan with W_PF × A_pp (S1). The conclusions of this paper implement a theoretical attempt for expanding the application scenarios of piezoelectric fan.

本文旨在对与细长振动压电风扇集成的非对称凹面的湍流和热性能进行数值研究。动态网格技术使用用户定义的函数来描述振动悬臂梁的位移函数，用于对细长压电风扇的变形进行及时建模。同时，选择 SST k-ω湍流模型来捕捉流动和传热的湍流行为。两个重要因素，半圆面两侧的相对曲率（RK）和风扇沿y轴偏移的无量纲距离（Δ y / A _PP) 在模拟过程中被考虑在内。在振动包络线附近观察到局部时间平均传热系数的显着增加。结果表明，当相对曲率( RK )大于2时，相对曲率( RK )对非对称凹面两端的流动和传热影响较大。并通过调整压电风扇的无量纲偏移距离( Δy) / A _PP )，W _PF  ×  A _pp风扇周围小区域的面积平均对流传热系数可提高 20%(S1)。本文的结论为拓展压电风扇的应用场景进行了理论尝试。