Analysis of Fluidic and Aero-acoustic Fields of Fluidic Chevron Nozzles
2015
The turbulent flow field and the acoustic field of fluidic chevron nozzles and chevron nozzles were studied at the Mach number Ma = 0.12, including numerical analysis of the flow fields and measurements of sound pressure. Based on computational fluid mechanics and air dynamics, the characteristics of the two turbulent flow fields and their far-field features were analyzed. Results show that fluidic chevron can bring a better noise reduction effect if the flow velocity is lower than that of the main jet which has larger inclination angle. Decrease magnitude of low-frequency noise of the fluidic chevron is smaller than that of chevron, but the noise reduction effect of the fluidic chevron can cover a broader range of frequencies and has less high frequency penalty than that of the chevron. Compared with chevron, fluidic chevron has some merits. It is an active control manner with adjustable parameters, and can be turned off when denoising is unnecessary.
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