弯曲/倾斜静叶对涡轮单音噪声影响的数值分析

doi:10.7527/1000-6893.2023.29366

Abstract

Abstract: The last stage of GE E3 low-pressure turbine is taken as the object of study, and the experimentally validated flow/acoustic field hybrid model is used to investigate the bend stator (-30°~30°), the lean stator (-15°~15°), and the partial combination of the bend/lean stator with serval angles on the aerodynamic performance of the turbine and the influence law of wake interaction tonal noise and potential interaction tonal noise, meanwhile, the physical mechanisms are preliminarily analyzed in terms of the flow field and the acoustic field. The results show that: (1) the isolated large-bending and large-leaning stator are favorable to improve the effi-ciency of the turbine stage, and the combination may even result in the efficiency gain of "1+1>2", and the potential interaction tonal noise is more affected by the bend or lean than that of wake interaction tonal noise, and the gain of noise reduction is more obvious; (2) the effect of large-bend or lean stator on the aerodynamic performance of the turbine is more significant. Compared to the isolated bend or lean stator, the combined bend/lean stator can realize both efficiency and noise gains, and the optimal scheme is the bend 20/lean 10 stator, which improves the aerodynamic efficiency by 0.16% and obtains a noise reduction gain of 1.84 dB at the same time; (3) The effect of the bend/lean stator on the efficiency is mainly related to the secondary flow and the blade loss, whereas the effect on the noise is mainly related to the interaction intensity and the phase changes. In conclusion, although the bend/lean stator is not a novel design option, the bend/lean stator has the potential to realize a high-efficiency and low-noise design of the turbine, and its physical mechanism and noise reduction law are still worthy of extensive research, then apply theoretical support for future engi-neering applications.

Key words: bend/lean, wake interaction tonal noise, potential interaction tonal noise, secondary flow, blade loss, interaction intensity, phase.

CLC Number:

V219

References

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Numerical analysis of the effect of bend/lean stator on turbine tonal noise

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