Abstract:

In order to understand the internal flow characteristics of the feedback fluidic oscillator, this paper established a three-dimensional numerical model of the feedback fluid oscillator. The internal flow characteristics of the jet oscillator are studied by numerical simulation. The internal flow process of the oscillator is quantified by monitoring the pressure change of the characteristic point and the mass flow rate change of the characteristic surface, and the internal flow process and principle are analyzed. The results show that the internal flow field of the positive feedback fluid oscillator oscillates periodically under the combined action of Coanda effect and eddy current. The fluid flow process in the oscillation cavity and feedback channel has good periodicity and stability, and the frequency is consistent with the oscillation frequency of the oscillator.

Key words: feedback fluidic oscillator, internal flow characteristics, pressure, mass flow rate

摘要：

为探索正反馈式流体振荡器内部流动特性，建立了正反馈式流体振荡器的三维数值模型。采用数值模拟的方法对流体振荡器的内部流动特性进行了研究，通过监测特征点的压力变化和特征面的质量流率变化，对振荡器的内部流动过程进行量化并分析其内部的流动过程和原理。结果表明，在柯恩达效应和涡流的共同作用下，该正反馈式流体振荡器内部流场呈周期性振荡，振荡腔和反馈通道中的流体流动过程具有良好的周期性和稳定性，且频率与振荡器振荡频率一致。

关键词: 正反馈式流体振荡器, 内部流动特性, 压力, 质量流率