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

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弯曲/倾斜静叶对涡轮单音噪声影响的数值分析

向康深,陈伟杰,连健欣,乔渭阳

西北工业大学

收稿日期:2023-07-26 修回日期:2023-10-07 出版日期:2023-10-08 发布日期:2023-10-08
通讯作者: 陈伟杰
基金资助:
国家科技重大专项;国家自然科学基金;国家自然科学基金

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

Received:2023-07-26 Revised:2023-10-07 Online:2023-10-08 Published:2023-10-08

摘要/Abstract

摘要： 以GE E3低压涡轮末级为研究对象，采用经过实验验证的流场/声场混合模型研究了弯曲静叶(-30°~30°)、倾斜静叶(-15°~15°)和部分角度下弯曲/倾斜组合静叶对涡轮气动性能和尾迹干涉单音噪声及位势干涉单音噪声的影响规律。同时，从流场和声场角度初步分析了倾斜/倾斜静叶的降噪机制。结果表明：（1）孤立的大弯曲和大倾斜静叶有利于提高涡轮级效率，两者组合静叶甚至可能出现“1+1>2”的效率收益，而相对于尾迹干涉单音噪声，位势干涉单音噪声受静叶弯曲或倾斜的影响更大，取得的降噪收益也更明显；（2）相对于孤立的弯曲或倾斜静叶，弯曲/倾斜组合静叶可以同时实现效率和噪声的双收益，最佳方案为弯曲20°/倾斜10°组合静叶，气动效率提升0.16%，同时获得1.84dB的降噪收益；（3）弯曲/倾斜静叶对效率的影响主要与二次流和叶型损失相关，而对噪声的影响主要与干涉强度和相位变化有关。总的来说，尽管弯曲/倾斜静叶不是新型设计方案，但是弯曲或倾斜静叶具备实现涡轮高效率和低噪声设计的潜力，其物理机制和降噪规律仍然值得开展大量研究，为未来工程应用提供理论支撑。

关键词: 弯曲/倾斜, 尾迹干涉单音噪声, 位势干涉单音噪声, 二次流, 叶型损失, 干涉强度, 相位

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.

中图分类号:

V219

向康深陈伟杰连健欣乔渭阳. 弯曲/倾斜静叶对涡轮单音噪声影响的数值分析[J]. 航空学报, doi: 10.7527/1000-6893.2023.29366.

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弯曲/倾斜静叶对涡轮单音噪声影响的数值分析

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

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