Numerical investigation of a centrifugal compressor with circumferential grooves in vane diffuser

9th International Conference on Compressors and their Systems

Chen, X.F.^1 ; Qin, G.L.^1 ; Ai, Z.J.^1,2

School of Energy and Power Engineering, Xi'An Jiaotong University, Xi'an

710049, China^1

School of Mechanical and Electronic Engineering, Sanming University, Sanming

365004, China^2

关键词: Casing treatment;    Circumferential groove casing treatment;    Effective measures;    Numerical investigations;    Operating ranges;    Radial locations;    Stable operation;    Turbo compressors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/90/1/012043/pdf
DOI  :  10.1088/1757-899X/90/1/012043

来源: IOP

【 摘 要 】

Enhancing stall and surge margin has a great importance for the development of turbo compressors. The application of casing treatment is an effective measure to expand the stall margin and stable operation range. Numerical investigations were conducted to predict the performance of a low flow rate centrifugal compressor with circumferential groove casing treatment in vane diffuser. Numerical cases with different radial location, radial width and axial depth of a circumferential single groove and different numbers of circumferential grooves were carried out to compare the results. The CFD analyses results show that the centrifugal compressor with circumferential grooves in diffuser can extend stable range by about 9% while the efficiency over the whole operating range decreases by 0.2 to 1.7%. The evaluation based on stall margin improvement showed the optimal position for the groove to be located was indicated to exist near the leading edge of the diffuser, and a combination of position, width, depth and numbers of circumferential grooves that will maximize both surge margin range and efficiency.