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中文核心期刊
Volume 55 Issue 1
Jan.  2023
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Zhang Bo, Zheng Haokai, Sun Dongsheng, Ding Hu, Chen Liqun. Theoretical analysis on the critical flow velocity and vibration mode of a twin-channel rotating pipe. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(1): 182-191 doi: 10.6052/0459-1879-22-456
Citation: Zhang Bo, Zheng Haokai, Sun Dongsheng, Ding Hu, Chen Liqun. Theoretical analysis on the critical flow velocity and vibration mode of a twin-channel rotating pipe. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(1): 182-191 doi: 10.6052/0459-1879-22-456

THEORETICAL ANALYSIS ON THE CRITICAL FLOW VELOCITY AND VIBRATION MODE OF A TWIN-CHANNEL ROTATING PIPE

doi: 10.6052/0459-1879-22-456
  • Received Date: 2022-09-27
  • Accepted Date: 2022-11-18
  • Available Online: 2022-11-19
  • Publish Date: 2023-01-18
  • Rotating blade is an essential part of aero-engine. It serves in harsh conditions. Its failure is often caused by excessive vibration. To design the blade properly and to ensure the reliability and safety, the vibration characteristics of the blade need to be revealed. The blade is simplified as a cantilever rotating pipe with double cooling channels based on the Euler-Bernoulli beam theory. The influences of channel axis offset on fluid kinetic energy are considered in the present study. The motion governing equation of the blade is established including the bi-gyroscopic effects with the combination of Lagrange principle and assumed mode method. The method of order reduction and dimension expansion is applied to solve the eigenvalue of the system. The influences of the fluid velocity ratio, rotating speed, slenderness et al. on the first three order eigenvalue curves are studied. The present model degenerates into a simply supported pipe conveying fluid with a single channel to compare with the results reported in literature. The correctness of the present modeling method is verified, partly. The velocity ratio of two channels has great influence on the first three order critical flow velocity values. For a given value of the cross-section area of the cooling passage, the critical flow velocity of the twin-channel model is higher than the single-channel model. A circling phenomenon is introduced to on the second and the third eigenvalue curves by the gyroscopic effect due to the rotating motion. The second and the third eigenvalue curves travel through the imaginary axis several times. With the increase of the slenderness ratio, the system’s dynamic behaviors are similar to the non-rotating cantilever pipe. Moreover, due to the gyroscopic effect, the modal response of the lateral displacement presents a traveling wave property. And the damping factor has different enhancement or weakening effects on the first three modes under different parameter conditions.

     

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