Noise Characteristics Contrastive Analysis of Dual Synthetic Jets Actuator and Synthetic Jet Actuator

Dual synthetic jets actuator (DSJA) has great potential application in airfoil separation flow control, jet vector control, heat dissipation and other aspects. However, DSJA can make noise of more than 80 dB under the optimal working frequency, which is very unfavorable for the application of DSJA in practical engineering. For the purpose of improving the performance of DSJA. It is important to study its noise characteristics in order for the noise reduction in the later stage. In this paper, DJSA is compared with synthetic jet actuator (SJA) in a series of acoustic experiments by using the multi-point response test method. For both two actors, the changes of sound pressure level and wind speed under different driving frequencies are studied. What’s more, the distribution laws of sound pressure level are analyzed at different measuring distances and angles. In addition, the spectral characteristics at different measuring distances are also discussed. Experiment results indicate that both the sound pressure level and the wind speed of these two actuators increase first and then decrease with the change of the driving frequency. However, under the same working frequency, DSJA makes a lower noise than SJA and produces a stronger directivity in the export orientation. Finally, there are few changes in the sound pressure level of the noise in the far field.