气动

Effect of Geometric Variation of Root Fillet on the Flow Characteristic of a Transonic Compressor Rotor

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  • 1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. Clean energy laboratory, Shandong University of Science and Technology, Qingdao 266590, China
    4. Key Laboratory of Aerodynamic Thermophysics of Shandong Province, Qingdao Institute of Aeronautical Technology, Qingdao 266400, China

网络出版日期: 2023-11-11

基金资助

This research work was sponsored by the Youth Fund of National Natural Science Foundation of China (Grant No.51906243), the General Program of National Natural Science Foundation of China (Grant No.52076124) and the General Program of Natural Science Foundation of Shandong Province (Grant No. ZR2020ME173).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Effect of Geometric Variation of Root Fillet on the Flow Characteristic of a Transonic Compressor Rotor

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  • 1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. Clean energy laboratory, Shandong University of Science and Technology, Qingdao 266590, China
    4. Key Laboratory of Aerodynamic Thermophysics of Shandong Province, Qingdao Institute of Aeronautical Technology, Qingdao 266400, China

Online published: 2023-11-11

Supported by

This research work was sponsored by the Youth Fund of National Natural Science Foundation of China (Grant No.51906243), the General Program of National Natural Science Foundation of China (Grant No.52076124) and the General Program of Natural Science Foundation of Shandong Province (Grant No. ZR2020ME173).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

在工程实际中,叶根倒角的存在及其几何尺寸变化对高负荷跨声速轴流压气机流动特性的影响愈发显著,有必要深入挖掘倒角几何效应与压气机转子综合特性之间的内在关联性。基于此,本文以NASA的Rotor67转子为研究对象,设计了八种具有不同半径尺寸的叶根倒角结构,以详细澄清倒角几何变化对压气机转子内流特性的影响规律及内在原因。数值结果表明,叶根倒角通过重塑转子叶根基元级由前缘点至尾缘点的沿程周向弯曲分布特征,并减小叶根后半段靠近尾缘附近的叶型几何偏折角度,从而使得Rotor67转子吸力面叶根角区分离问题得到显著抑制,明显改善了该区域的通流能力和做功能力。然而值得注意的是,叶根倒角的存在还间接诱发了压气机转子叶尖流动特性的明显恶化,这说明叶根倒角几何效应与转子叶尖流动特性之间存在一定的间接关联性。进一步分析发现,叶根倒角的存在会直接影响到压气机转子三维流场内存在的径向压力平衡关系。在新的径向压力平衡作用下,相对较大的叶根倒角半径会导致压气机转子叶尖载荷的明显增加,并在叶尖区域诱发相对更强的间隙泄漏流动,进而导致压气机工作裕度的进一步恶化。随着叶根倒角半径的单调增加,跨声速压气机转子的稳定工作裕度会呈现出单调递减的变化规律。在此基础上,本文进一步应用叶尖正弯方法以有效抑制由叶根倒角间接诱发的压气机叶尖流场恶化的问题。结果表明,在分别由叶根倒角和叶尖正弯共同影响下的新的径向压力平衡关系的作用下,新转子叶片的径向和流向载荷分布特征趋于更加合理,且转子叶尖前1/3弦长区域的叶表两侧静压差显著减小,进而使得该区域的间隙泄漏流强度也明显降低,并明显抑制了带倒角转子叶尖流动恶化的问题,最终显著改善了高负荷压气机转子的综合气动性能。

本文引用格式

CUI Weiwei, LIU Yuqiang, LIU Fusong, RUAN Changlong, YANG Laishun, LI Longting, YAO Fei, WANG Xinglu, WANG Cuiping . Effect of Geometric Variation of Root Fillet on the Flow Characteristic of a Transonic Compressor Rotor[J]. 热科学学报, 2023 , 32(4) : 1407 -1420 . DOI: 10.1007/s11630-023-1815-x

Abstract

The effects of root fillet on the flow behavior of high loading compressor rotor tends to be much more crucial in practice, and it’s necessary to explore the internal relations between the geometric effects of root fillet and the flow behaviors of rotor blade. Therefore, eight types of root fillet with different radius were designed and installed around the blade root of NASA Rotor67. With the aids of fillet, the corner separation near suction side of blade root has been suppressed significantly in that the root fillet reconstructs the circumferential bending distributon of the suction-side curve from leading edge to trailing edge, and reduces the genmetric turning angle in the latter part of root section near trailing edge. However, apart from the improvement of corner flow characteristic caused by root fillet, both the tip flow deterioration and the decrease of stall margin occur in the new rotors, which indicates an indirect correlation between tip flow characteristic and root fillet exists indeed in the three-dimensional flowfields of transonic rotor. Actually, by means of the new radial pressure equilibrium affected by root fillet, a larger radius of root fillet contributes to much larger blade loading and stronger leakage flow in tip region of compressor rotor. As a result, a monotonic decrease of stall margin was present in the transonic rotor with increase of the root fillet radius. Subsequently, the positive bending of blade tip was introduced to deal with the negative effect caused by the root fillet indirectly. Combined with the effects of root fillet and positive tip-bending on the radial pressure equilibrium existing in channels, both the radial and streamwise loading distributions tend to be much more reasonable in new rotors, and the static pressure difference in former 1/3 chord of blade tip has decreased clearly which benefits to reduce the strength of leakage flow in tip region. Therefore, the flow deterioration in tip region of transonic rotor induced by root fillet has been well suppressed, with an obvious improvement of overall performance occurring in new rotors.

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