Multi-Field Load and Stress Analysis of Centrifugal Compressor Impeller

DONG Hongzhen; ZHANG Hong; HONG Zhouzhensen; WU Xintao

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (2) : 25-31.

DONG Hongzhen¹,ZHANG Hong¹,HONG Zhouzhensen¹,WU Xintao²

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Abstract

The fluid-solid coupling calculation model was established, and the centrifugal load, thermal load, aerodynamic load and corresponding stress of centrifugal compressor impeller were studied. For the model of fullcycle centrifugal compressor with a volute, the unidirectional steady-state fluid-solid coupling method was used to analyze the non-uniformity of aerodynamic load, thermal load and corresponding stress in the circumferential direction. The main stress components for each part of the impeller in the cylindrical coordinate system and the stress formation mechanism were discussed. The proportion of stress in each field was then quantitatively analyzed. Finally, the ratio of each stress field under multiple working conditions was compared. The results show that the aerodynamic load and stress have greater unevenness in the circumferential direction, the aerodynamic stress of blade with pressure surface facing the tongue is greater, and the aerodynamic stress of blade decreases in the reverse rotation direction. The main stress components for each part of the impeller were found to be different under different loads. Under different working conditions, the proportion of each stress field is basically the same. The centrifugal stress has a dominant influence, followed by the thermal stress and then the aerodynamic load.

Key words

centrifugal compressor / fluid-solid coupling / multi-field load / stress analysis

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DONG Hongzhen,ZHANG Hong,HONG Zhouzhensen,WU Xintao. Multi-Field Load and Stress Analysis of Centrifugal Compressor Impeller[J]. Vehicle Engine. 2021, 0(2): 25-31