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Aeroengine. 2014, (04)

Analysis on Dynamic Characteristics of Combined Compressor Based on Coupling of Rotor and StatorChinese Full Text

QI Wen-kai;WANG Xiang-hui;College of Power and Energy, Nanjing University of Aeronautics and Astronautics;

Abstract: The combined compressors are widely used in the small and medium-sized aeroengines. The dynamic coupling phenomenon between the rotor and stator is more and more serious because of the higher speed and thinner case. It is necessary to study the dynamic characteristics of rotor-bearing-case system of the combine compressor. The physical models and the finite element models of the combined compressor with different case thickness were established. The dynamic characteristic of the combined compressor was analyzed by the rotor-bearing system and the rotor-bearing-case system by the finite method. The model analysis was performed on the case, and the unbalance response was analyzed on the rotor-bearing-case system. The results show that a new critical speed appeared because of the coupling of rotor and stator, which main shape is the flexure vibration of the case. At the same time, the critical speeds with the rotor’s flexure vibration are also impacted obviously. The coupling effect of rotor and stator on the critical speed should be considered in the engineering application.
Keywords：

combined compressor; dynamic characteristics; coupling; finite element; critical speed; aeroengine;

  • DOI：

    10.13477/j.cnki.aeroengine.2014.04.009

  • Series：

  • Subject：

  • Classification Code：

    V231

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