Abstract This study reports on a numerical investigation of the impact of an oscillating rigid plate guide vane on the transient behavior of thermo-hydraulic fields within a square cavity with single inlet and outlet ports. The computational fluid dynamics software ANSYS® FLUENT was employed to perform the numerical simulations. The numerical analysis focused on the effect of the frequency and amplitude of an oscillating rigid guide vane on modification of the transverse throughflow, internal flow re-distribution, re-arrangement of multiple rotating vortices and the ensuing heat transfer performance. According to the numerical results, it is shown that for a combination of the Strouhal number and amplitude of inclination angle of the guide vane, the instantaneous Nusselt number that is a measure of the thermal performance of the system exhibits cyclical changes once the respective periodic state was reached. Moreover, the cycle-averaged and peak-to-peak Nusselt number increases with the increase of the amplitude of oscillations as the frequency of oscillation is fixed. For a fixed amplitude of oscillation, the cycle-averaged and peak-to-peak Nusselt number decreases as the frequency increases. Instantaneous variations of the dimensionless pressure drop of the cavity also exhibited periodic oscillations. Enhancement of heat transfer due to oscillations of the guide vane was accompanied with the expense of increasing the pressure drop.

中文翻译：

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单进出水口方腔内摆动导叶对热工水力场的影响

摘要 本研究报告了振动刚性板导叶对具有单个入口和出口端口的方腔内热液压场瞬态行为影响的数值研究。采用计算流体动力学软件 ANSYS® FLUENT 进行数值模拟。数值分析侧重于振动刚性导叶的频率和振幅对横向通流的修改、内部流动的重新分布、多个旋转涡流的重新排列以及随之而来的传热性能的影响。根据数值结果表明，对于 Strouhal 数和导叶倾角幅度的组合，一旦达到相应的周期性状态，作为系统热性能的量度的瞬时努塞尔数就会表现出周期性变化。此外，当振荡频率固定时，循环平均和峰峰值努塞尔数随着振荡幅度的增加而增加。对于固定振幅的振荡，周期平均数和峰峰值努塞尔数随着频率的增加而减小。空腔无量纲压降的瞬时变化也表现出周期性振荡。由于导叶的振荡而增强的传热伴随着增加压降的代价。当振荡频率固定时，循环平均和峰峰值努塞尔数随着振荡幅度的增加而增加。对于固定振幅的振荡，周期平均数和峰峰值努塞尔数随着频率的增加而减小。空腔无量纲压降的瞬时变化也表现出周期性振荡。由于导叶的振荡而增强的传热伴随着增加压降的代价。当振荡频率固定时，循环平均和峰峰值努塞尔数随着振荡幅度的增加而增加。对于固定振幅的振荡，周期平均数和峰峰值努塞尔数随着频率的增加而减小。空腔无量纲压降的瞬时变化也表现出周期性振荡。由于导叶的振荡而增强的传热伴随着增加压降的代价。