Analysis of Dynamic Characteristics of the Rotating Shrouded Blade Considering Elastic Support

doi:10.12068/j.issn.1005-3026.2019.08.010

Abstract

Abstract: An analytical model of the shrouded blade considering elastic support is established， in which the influence of the blade’s rotational effect， setting angle， twist angle and variable cross-section are taken into consideration. ANSYS software is used to establish a corresponding finite element model to verify the effectiveness of the established analytical model. The influence of the support stiffness and shoulder position on the dynamic characteristics of the blade is analyzed through the established analytical model and finite element model. The results indicate that as the support stiffness increases， the natural frequency of the shrouded blade increases. However， after the support stiffness increases to a certain extent， the increase of the support stiffness will no longer cause the increase of the natural frequency. In addition， as the distance from the shoulder position to the blade tip increases， the first-order and third-order natural frequency of the shrouded blade tends to increase. In contrast， the second-order natural frequency will decrease. In addition， analytical methods can significantly improve the computational efficiency.

Key words: shrouded blade, elastic support, variable cross-section, dynamic characteristics

CLC Number:

TH13.1

MA Hui， CUI Can， ZENG Jin， WEN Bang-chun. Analysis of Dynamic Characteristics of the Rotating Shrouded Blade Considering Elastic Support[J]. Journal of Northeastern University Natural Science, 2019, 40(8): 1115-1121.

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