扭转角误差统计分析及对三维压缩机转子气动性能的不确定影响

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-07-26 DOI:10.3390/aerospace11080614
Yue Dan, Ruiyu Li, Limin Gao, Huawei Yu, Yuyang Hao
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引用次数: 0

摘要

沿叶片径向的扭转角误差是不确定的,并受到切削力、刀具磨损和其他因素的影响。本文对 72 个转子叶片的 13 个截面的扭转角误差测量值进行了创新性分析,以获得合理的统计分布。结果令人惊讶地发现,扭转角误差的欠偏系统偏差沿径向呈逐渐增大的 "W "形分布,而散点近似线性。结合非侵入式多项式混沌方法,有效量化了径向非均匀扭转角误差不确定性对三维压缩机转子气动性能的影响。结果表明,由于系统偏差的存在,典型工况下的质量流量、总压比和等熵效率的平均值均低于标称值,这表明挠度不足的扭转角误差导致了压缩机推力的下降。压缩机的稳定运行范围对扭转角误差的散度更为敏感,其散度比总压比和等熵效率的散度大一个数量级,表明压缩机安全稳定运行的风险增加。此外,尖端区域的流场受扭转角误差的影响很大,尤其是在近滞流工况的冲击波位置。
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Twist Angle Error Statistical Analysis and Uncertain Influence on Aerodynamic Performance of Three-Dimensional Compressor Rotor
Twist angle errors along the blade radial direction are uncertain and affected by cutting force, tool wear, and other factors. In this paper, the measured twist angle errors of 13 sections of 72 rotor blades were innovatively analyzed to obtain the rational statistical distribution. It is surprisingly found that the under-deflection systematic deviation of twist angle errors shows a gradually increasing W-shaped distribution along the radial direction, while the scatter is nearly linear. Logically, the statistical model is established based on the linear correlation of the scatter by regression analysis to reduce variable dimension from 13 to 1. The influence of the radial non-uniform twist angle errors’ uncertainty on the aerodynamic performance of the three-dimensional compressor rotor is efficiently quantified combining the non-intrusive polynomial chaos method. The results show that the mean values of mass flow rate, total pressure ratio, and isentropic efficiency at the typical operating conditions are lower than the nominal values due to the systematic deviation, indicating that the under-deflection twist angle errors lead to the decrease in compressor thrust. The compressor’s stable operating range is more sensitive to the scatter of twist angle errors, which is up to an order of magnitude greater than that of the total pressure ratio and isentropic efficiency, indicating the compressor’s safe and stable operation risk increases. Additionally, the flow field at the tip region is significantly affected by twist angle errors, especially at the shock wave position of the near-stall condition.
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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