Influence of Blade Thickness Distribution on the Structural Dynamic Characteristics Under Part-Load Condition

Abstract

Due to the internal flow field is unstable under part-load condition, which has great influence on the structure strength of impeller. Therefore, in order to improve the operation stability, four different thickness distribution blades were proposed, the energy performance, internal flow field and structural dynamic characteristics under 0.2 Q were investigated based on the CFX and Workbench. The results show that the natural frequency is increased by thickening the blade, and the natural frequency of the blade with decrement thickness distribution is larger than the increment one. However, the equivalent stress of the local thickening blade is much lower than uniform thickness blade, that is, the internal flow field and strength of the impeller can be obviously improved by employing the increment thickness distribution. Finally, the test of the blade with increment thickness distribution was conducted to benchmark the accuracy of the simulation. This research could provide reference to the improvement of blade strength characteristics under the part-load condition.

DOI: http://dx.doi.org/10.5755/j01.mech.25.1.22882