Experimental and numerical simulation on supersonic multi jet noise

DOI:	10.11809/bqzbgcxb2023.08.034
Keywords:	multi jet; noise; experimental test; large eddy simulation
Abstract:	In order to analyze the noise characteristics of supersonic multi jet gas, this paper carries out experimental and numerical simulation of the quadruple jet. In the numerical simulation, large eddy simulation combined with Ffowcs Williams & Hawkings acoustic model is used to calculate the quadruple jet, and the noise results are compared with those of the experimental measurement to verify the reliability of the numerical calculation method. The results show that the variation trend of the simulation results fits well with the experimental results, in which the relative error of the total sound pressure level of the measuring point far from the ground between the simulation and the experiment is about 1.2%. It is therefore verified that the numerical method used can accurately predict the supersonic multi jet noise. In the highly under expanded state, the four jets from the quadruple jet nozzles interact with each other, and the flow rapidly changes into turbulent state after the merging of the four jets. The large scale downstream mixed noise turbulent of the jet is the main source of the quadruple jet nozzles, and the total sound pressure level is the highest along the jet direction. The research results provide a reference for the design of supersonic nozzles and their noise reduction scheme.
Published:	2023-08-28
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