| Citation: | TANG Xiaolong, SONG Heng, YANG Xiaoquan, et al. Buzz-saw noise considering blade tip clearance and blade variations[J]. Journal of Aerospace Power, 2026, 41（1）：20240150 doi: 10.13224/j.cnki.jasp.20240150
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Rotors with three tip clearances, as well as random stagger disturbances, were established with NASA Rotor 67 as the prototype. Through full-annulus numerical simulations and theoretical derivations based on cascade assumptions, the effects of blade tip clearance and the coupling effects of blade tip clearance and blade stagger disturbances on buzz-saw noise were analyzed. The results showed that: (1) there was a coupling relationship between the leakage flow induced by blade tip clearance and the generation of forward propagating buzz-saw noise. As the blade tip clearance increased, the leakage flow was enhanced, leading to channel blockage, indirectly reducing the shock intensity and corresponding buzz-saw noise; (2) the extra component of buzz-saw noise generated by tip leakage flows can only propagate to the far field by coupling with the blade variations; (3) a theoretical model was established to account for the coupling effect of tip clearance and blade variations on buzz-saw noise. The validation by numerical simulations showed that this model had relatively high accuracy for the analysis of buzz-saw noise.
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