| Citation: | XIANG Kangshen, CHEN Weijie, LIAN Jianxin, et al. Numerical study of stator serrated trailing-edge to control turbine broadband noise[J]. Journal of Aerospace Power, 2025, 40（1）：20230120 doi: 10.13224/j.cnki.jasp.20230120
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Using delayed detached eddy simulation/analogy acoustics (DDES/AA) hybrid simulation method, the noise reduction effects and physical mechanism of upstream stator with “arch” distributed trailing edge (Bionic S) and downstream rotor with “arch” distributed leading edge (Bionic R) on turbine turbulent wake interaction broadband noise were studied. The research found that, except for individual frequencies, the upstream “arched” trailing edge stator blades (Bionic S) and the downstream “arched” leading edge rotor blades (Bionic R) can reduce the turbulent wake interaction broadband noise at most of frequencies below 10 kHz. Based on this, the wake characteristics and physical mechanism of noise reduction of Bionic S were preliminarily explored. Bionic S can change the characteristics of the stator wake, making it show periodic changes in the span direction, and then periodical distribution of the time-space correlation coefficient of pressure fluctuation, indicating that the bionic configuration greatly enhanced the phase-delay of pressure fluctuation at different spanwise positions. The influence existed in the entire interaction between wake and suction surface during downstream transport. And the discontinuous characteristics of spatial correlation coefficient distribution of the pressure fluctuation showed the necessity of noise reduction study of bionic configuration in the future to be carried out in the three-dimensional flow.
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