开式转子噪声数值模拟与试验研究 postprint

Abstract: In order to the study the characteristics of open-rotor noise in low speed , CFD ( computationalfluid dynamics)/CAA ( computing aerodynamic acoustics ) hybrid method of the open-rotor tone noise wasset up.N-S equation is expanded by NLH method in the frequency domain, and the unsteady componentsare obtained.'These unsteady components and steady load are used to construct Lighthill sound source.Fi-nally ,FW-H integration method is used to calculate far-field noise radiation. The noise experimental plat-form is built and test scheme is designed.The noise directivity in the range of 0� -90� is measured by usingthe far-field directivity array surround scale prototype. The characteristic of the noise of open-rotor is ana-lyzed by comparing the numerical simulation results and experimental results. The results show that inter-action noise is the major component of open-noise.'The simulation results are basically consistent with thedistribution trend of the experimental results at key frequency ,the error is within 3 dB.'The numerical sim-ulation method of aerodynamic noise based on nonlinear harmonic method is developed to solve unsteadydisturbance in frequency domain , which can provide some help for rapid and accurate prediction of open rotor noise.