引用格式：王庆宇,刘琪麟,赖焕新.高亚声速喷流近场的流-声关联［J］.航空动力学报,2020,35(12):2532-2542.WANG Qingyu,LIU Qilin,LAI Huanxin.Flow-acoustics correlations in near-fields of high subsonic jet［J］.Journal of Aerospace Power,2020,35(12):2532-2542.Flow-acoustics correlations in near-fields of high subsonic jet

Large eddy simulation was carried out to predict the flow and acoustic near fields of a subsonic jet at Mach number of 0.9. The calculation was validated by available DNS and experimental data. Then the correlations between turbulent fluctuations along the center line and shear layer of the jet and the monitored sound pressure signals were analyzed. Furthermore, attentions were also paid to temperature signals on center line so as to unveil their contribution to sound. Results showed that the correlation coefficient peaks near the end of the potential core, indicating that the turbulence signals here contributed the most to the near-field sound pressure signal,and the flow in this area also had high intermittent and convective velocity. The near field sound pressure was also strongly correlated with the fluctuations of the temperature on the center line. But for the gradient of the temperature, only the radial component was intensely correlated with the sound pressure, while the correlation between axial component of the temperature gradient and the sound signal was relatively weak，indicated that the axial temperature gradient contributed little to the near field sound pressure under the simulated temperature ratio.