流体振荡器的数值研究

Numerical Study of a Fluidic Oscillator

流体振荡器是一种能在入口提供定常流动,出口产生非定常流动的流体器件。本文以数值模拟为主要手段,研究一种流体振荡器内部流场特性,并研究其附壁和切换机理,提出流体振荡器切换的快慢与其控制端的激励有关。随着激励压力的增加,射流切换越快;激励周期越小,出口射流切换频率越大。对流体振荡器的研究设计具有一定的指导意义。

Fluidic oscillator is a device which can generate unsteady flow at the outlet, when supplied with steady flow at the inlet. In this paper, numerical simulation is used to research the internal flow field characteristics of a fluidic oscillator, as well as the wall-attachment and switching mechanism. The switching speed of the fluidic oscillator is related to the excitation of the control port. The more pressurized flow at the control port, the faster the jet is switched, the jet switching frequency at the outlet is increasing with the reducing of period excitation. And the results presented in the paper can be applied to some significance for the study of fluidic oscillator design.