Dynamic similarity design method for aero-engine low-pressure rotor system

被引：0
|
作者：
Miao H. [1 ]
Zang C. [1 ]
机构：
[1] Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2020年 / 35卷 / 04期
关键词：
Dynamic similarity; Model test; Model updating; Rotor system; Similarity criterion; Similarity relationship;
D O I：
10.13224/j.cnki.jasp.2020.04.010
中图分类号：
学科分类号：
摘要：
Dynamic similarity design of an aero-engine rotor system was presented to study its dynamic characteristics using the design model instead of the real structural system. Firstly, the similar equivalent model of the rotor full scale prototype, based on the dynamic equivalence principle of the rotor system, was established by dynamic optimization. Then, the dynamic similarity criterions of the rotor system were derived by equation analysis combined with dimensional analysis, and the reduced-scale model of the similar equivalent model was constructed according to the similarity relations of the rotor design parameters. Finally, using the model updating method, the dynamic similarity model of high prediction accuracy was obtained by updating the similarity error of the three-dimensional design model. Taking the dynamic similarity design for the low-pressure rotor of the dual-rotor aero-engine as an example, the effectiveness of the dynamic similarity design method was validated by finite element simulation. Results showed that the dynamic similarity model obtained by this method could effectively predict the critical speeds and unbalance responses of the full scale prototype within the design operation speed. The similarity errors for the first three critical speeds were 3.09%, 1.75% and 0.31%, respectively, and the corresponding modal assurance criterion values were all above 0.93. This method has great value for practical application, and provides a reference for dynamic similarity design of the whole aero-engine. © 2020, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：766 / 776
页数：10
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