Effects of loudspeaker-driven synthetic jet actuator parameters on the characteristics of the synthetic jet

Abstract

In this study, a method for calculating synthetic jet actuator (SJA) parameters by combining diaphragm boundary conditions based on the laws of particle vibration and geometric parameters of the cavity is proposed to obtain accurate rules of variation in which the characteristics of a synthetic jet (SJ) are affected by actuator parameters. Based on the calculating method,an aeroacoustics simulation model of loudspeaker-driven SJA is established with COMSOL software. Simulation results show that the influence of cavity geometry parameters on the velocity characteristics of SJ is greater than that of exciter parameters under the excitation of Helmholtz resonance frequency. Moreover, changing the cavity parameters can increase the jet velocity and reduce the sound pressure level. The velocity characteristics of SJ are consistent with the experimental results.On the basis of the simulation results, the relationship between the aperture length, the cavity length and the modulus of mechanical impedance is established to achieve the maximum jet velocity. It solves various complicated problems of the cavity geometry parameters caused by excitation frequency.