Effects of excitation parameters on flow field around synthetic jet in cross-flow
To use synthetic jets for surface flow control of vertical axis wind turbine blades, it is necessary to understand and master the interaction rules between synthetic jets and boundary layers.In this paper, a numerical simulation method is employed to study the synthetic jet on a flat plate and to analyze the flow field characteristics of synthetic and continuous jets in a cross-flow.The effects of synthetic jet on the flow field at three excitation frequencies and three velocity ratios are compared.Our results show when the velocity ratio is the same, the effect of synthetic jet on boundary layer is better than that of continuous jet.The synthetic jet acts on the boundary layer in different ways at different moments of blowing and inhaling.The development trajectory of the synthetic jet in the cross-flow is affected by the velocity ratio and the excitation frequency.When the velocity ratio is larger, the slope of the jet trajectory near the orifice is larger.When the excitation frequency is larger, the slope of the jet trajectory near the orifice becomes smaller.
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