热力发电2017，Vol.46Issue(9)：92-98,103,8.DOI:10.3969/j.issn.1002-3364.2017.09.092
离心压气机无叶扩压器内部流动三维数值研究
Three-dimensional numerical simulation and flow investigation of the centrifugal compressor with vaneless diffuser
摘要
Abstract
The vaneless diffuser is an important part of the centrifugal compressor. It is important to study the characteristics of the flow field in the vaneless diffuser for improving the performance of the diffuser and understanding the occurrence of the stall. The purpose of this study is using the steady state viscosity calculation method to explore the evolution of the vaneless diffuser internal flow field under different flow rates, using the Workbench15.0 software to model the centrifugal compressor and implement numerical simulation and the centrifugal impeller and vaneless diffuser are analyzed. The results show that, the vaneless diffuser backflow zone occurs at the diffuser hub side, with the decrease of the flow coefficient, the backflow region appears in the diffuser shroud side, when the flow coefficient of further reduces, the backflow zone appears in the diffuser wall on both sides. The vaneless diffuser does not immediately enter the stall state when the backflow zone appears. When the backflow zone expands to the diffuser outlet, the diffuser enters into rotating stall state. The unsteady flow in the diffuser can be represented by the static pressure in the diffuser, and the static pressure rise coefficient will decrease when the rotating stall occurs in the vaneless diffuser.关键词
离心压气机/无叶扩压器/旋转失速/流场分析/流量/静压升系数/回流区Key words
centrifugal compressor/vaneless diffuser/rotating stall/flow analysis/flow rate/static pressure rise coefficient/recirculating zone分类
能源科技引用本文复制引用
张磊,李康,王松岭..离心压气机无叶扩压器内部流动三维数值研究[J].热力发电,2017,46(9):92-98,103,8.基金项目
国家自然科学基金项目(11602085) （11602085）
河北省自然科学基金项目(E2016502098)National Natural Science Foundation of China(11602085) （E2016502098）
Natural Science Foundation of Hebei Province(E2016502098) （E2016502098）
