摘要
多级离心压缩机广泛应用于航空领域,提高其工作效率可有效降低系统能耗及运行成本,而回流器作为多级离心压缩机中的一个重要部件,对级效率有着高达6%~8%的影响。为了降低回流器的流动损失,采用三维数值模拟方法研究了回流器的叶片叶型与叶片数对两级离心压缩机性能的影响,计算得到回流器叶型、扩散因子与回流器的总压恢复系数的关系,分析回流器不同叶高处的内部三维流场。结果表明:回流器叶片采用NACA65-015型、回流器叶片数目为21片时,该两级高速离心压缩机在设计点的整体性能最优,其等熵效率为81.85%、压比为2.502,满足设计要求;同时在大流量工况下,整机的效率和压比随叶片数增多而提升。本研究能够为多级离心压缩机回流器的设计优化提供技术指导。
Multi-stage centrifugal compressors are widely used in the aviation industry,and it can effectively reduce system energy consumption and operating costs by improving their efficiency.As an important component in multistage centrifugal compressors,the recirculator has a significant impact on the stage efficiency by up to 6%~8%.In order to improve the efficiency of the reflux,the three-dimensional numerical simulation has been applied to investigate the impact of the blade profile and number of blades on the performance of the two-stage centrifugal compressor.The relationship between the blade profile,diffusion coefficient and the total pressure recovery coefficient of the reflux device has been obtained.The three-dimensional internal flow fields of the device at different blade heights are analyzed.The results show that the overall performance of the two-stage high-speed centrifugal compressor is optimal at the design point when the number of reflux is 21 and the type of NACA65-015 is selected as the reflux blade.The two-stages centrifugal compressor can meet the design requirements with an isentropic efficiency of 81.85%and a total pressure ratio of 2.502.At high flow condition region,the efficiency and total pressure ratio of the entire compressor increase with the increase of blades number.This study can provide technical guidance for the design and optimization of the reflux of a multi-stage centrifugal compressor.
作者
兰林柯
田梓呈
杜文海
LAN Lin-ke;TIAN Zi-cheng;DU Wen-hai(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《汽轮机技术》
北大核心
2024年第6期423-429,438,共8页
Turbine Technology
基金
北京市教育委员会科技计划一般项目(KM201910017007)
国家自然科学基金(52076015)。
关键词
多级离心压缩机
数值模拟
回流器叶型
回流器叶片数
multistage centrifugal compressor
numerical simulation
reflux blade profile
reflux blade number
作者简介
兰林柯(1998-),女,硕士研究生。研究方向为高效低碳能源利用及先进动力设备。
