流体机械2025，Vol.53Issue(4)：53-60,8.DOI:10.3969/j.issn.1005-0329.2025.04.008
基于PEMFC性能需求的两级增压叶轮出口安装角联合设计
Joint design of two-stage boosting impeller exit blade angles based on PEMFC performance requirements
摘要
Abstract
To address the issues of excessive mass flow at surge boundary in the high‑pressure stage and increased surge susceptibility in two‑stage centrifugal compressors,this study investigates the key structural parameter of impeller exit blade angle affecting surge characteristics.Based on CFD numerical simulations validated by the classical Krain impeller model,the influence of exit blade angles in low and high‑pressure stage impellers on overall compressor performance was analyzed.Results show that at the design speed of 70 000 r/min,smaller exit blade angles in both stages improve compressor efficiency at low flow conditions(0.02~0.07 kg/s)with slight pressure ratio reduction.Optimized smaller exit blade angles enhance efficiency by over 3%at low flow rates,reduce surge boundary mass flow by more than 25%,and significantly improve flow stability.The maximum static entropy increase in low and high‑pressure stages decreases by approximately 50%and 25%,respectively,reducing flow losses.This study provides design guidelines for developing two‑stage boosting systems for PEMFC applications.关键词
燃料电池/两级低比转速离心式压气机/低流量高压比工况/两级联合设计Key words
fuel cell/two‑stage low specific speed centrifugal compressor/low‑flow high‑pressure ratio condition/two‑stage joint design分类
机械工程引用本文复制引用
杨汉乾,周海鹏,曹岁丰,周乐锋,杨国旗,陈少林..基于PEMFC性能需求的两级增压叶轮出口安装角联合设计[J].流体机械,2025,53(4):53-60,8.基金项目
湖南省自然科学基金项目(2024JJ7637) （2024JJ7637）
湖南省杰出青年基金项目(2022JJ10009) （2022JJ10009）
