几何结构对S-CO2离心压缩机热力学性能影响分析
Effect of geometric structure on the thermodynamic performance of S-CO2 centrifugal compressor
赵富龙 1田游游 1田瑞峰 1胡朝营 2刘凯1
作者信息
- 1. 哈尔滨工程大学 核科学与技术学院,黑龙江 哈尔滨 150001;黑龙江省核动力装置性能与设备重点实验室,黑龙江 哈尔滨 150001
- 2. 中车株洲电机有限公司,湖南 株洲 412000
- 折叠
摘要
离心压缩机是超临界二氧化碳(S-CO2)布雷顿循环中的核心部件,其内部结构与流动换热机理复杂,为了研究多种结构对S-CO2 离心压缩机性能影响,本文针对某兆瓦级S-CO2 离心压缩机进行了一维和三维数值方法模拟.基于该模型采取线性加权和法对压缩机 5 种不同结构参数变化引起的热力学性能进行了量化研究.结果表明:叶片后弯角和无叶扩压器长度对离心压缩机性能的影响最大,其次是叶片数、分流叶片长度和叶顶间隙;增加叶片数可提高叶轮做功能力和压比,但增加过多会降低效率;0.25～0.75 mm内,随着叶顶间隙增加,离心压缩机的压比和效率降低,最佳分流叶片长度系数为 0.74.本文研究结果可为后续S-CO2 布雷顿循环系统中离心压缩机设计提供参考.
Abstract
Centrifugal compressors are the core components of the supercritical carbon dioxide(S-CO2)Brayton cy-cle,and their internal structure and flow heat transfer mechanism are complex.Therefore,this study conducts one-dimensional and three-dimensional numerical simulations on MW-level S-CO2 centrifugal compressors to investigate the effect of multiple structures on the performance of S-CO2 centrifugal compressors.Based on this model,a linear weighted sum method is used to quantitatively study the thermodynamic performance caused by changes in five dif-ferent structural parameters of the compressor.The results show that the back bend angle of the blades and the length of the vaneless diffuser have the greatest effect on the performance of the centrifugal compressor,followed by the number of blades,the length of the splitter blades,and the tip clearance.Additionally,increasing the number of blades can improve the power capacity and pressure ratio of the impeller,but too much will reduce efficiency.The pressure ratio and efficiency of the centrifugal compressor decrease with the increase in blade tip clearance within the 0.25～0.75 mm range.The optimal splitter blade length coefficient in this paper is 0.74.The findings of this study can provide a reference for the subsequent design of centrifugal compressors in the S-CO2 Brayton cycle system.
关键词
超临界二氧化碳/离心压缩机/线性加权和法/几何敏感性/热力学性能/几何结构/布雷顿循环/流动换热Key words
S-CO2/centrifugal compressor/linear weighted method/geometric sensitivity/thermodynamic proper-ties/geometric structure/Brayton cycle/flow and heat transfer引用本文复制引用
基金项目
国家级青年人才项目(2021QNRC001)
出版年
2023
国家科技期刊平台
NSTL
万方数据