摘要
以工程中某直径400mm自由曲面叶轮为研究对象,将自由曲面叶片转化为直纹面以降低铣制成本,同时,为了确定叶片转化后对气动性能的影响,使用CFD软件Numeca模拟了在三个马赫数下自由曲面叶轮和转换后的直纹面叶轮内部流场情况,并在模型级试验台上进行气动性能试验验证。试验结果与数值分析结果均显示,转化后的直纹面叶轮与自由曲面叶轮对比,整体流量范围拓宽11%,设计工况下能量头系数τ提高了6.8%、压比ε提高1.5%、多变效率ηpol接近相同,则证明两者气动性能接近相同。通过进一步研究,产生以上结果的原因是转换后的直纹面叶轮叶片进口安装角度略变小,使得叶片前缘低能流体区减少,有效地提升了压比和多变效率;同时,转化后的直纹面叶轮进口喉部面积略增大,使得叶轮的稳定流量范围拓宽。基于以上研究成果,成功将转化后的直纹面叶轮应用于生产实践。
The research focused on a arbitrary surface impeller with a diameter of 400mm in engineering.The blade arbitrary surface was transformed into a ruled surface to reduce milling costs.To determine the effect of the blade transformation on aerodynamic per-formance,CFD software Numeca was used to simulate the internal flow field of the impeller at three Mach numbers for both the origi-nal arbitrary surface impeller and the transformed ruled surface impeller.Aerodynamic performance tests were conducted on a model test stand.The results showed that the experimental results were consistent with the numerical analysis results.A comparison between the transformed ruled surface impeller and the original arbitrary surface impeller revealed that the flow range was expanded overall by 11%.Under design conditions,the head coefficientτincreased by 6.8%,the pressure ratioεis enhanced by 1.5%,and the variable efficiencyηpol remained similar.These findings demonstrate that the aerodynamic performance of the two types of impellers is approxi-mately the same.The study indicated that the blade inlet installation angle of the transformed ruled impeller slightly decreased,reduc-ing the low-energy fluid region at the leading edge of the blade and effectively improving the pressure ratio and the variable efficien-cy.Additionally,the slight increase in the inlet throat area of the impeller after transformation led to an expanded stable flow range.The transformed ruled surface impeller has been successfully applied in production practice.
作者
魏国家
魏兆成
孙玉莹
WEI Guojia;WEI Zhaocheng;SUN Yuying(Department of Mechanical and Electrical Engineering,Liaoning Provincial College of Communications,Liaoning Shenyang 110122,China;School of Mechanical Engineering,Dalian University of Technology,Liaoning Dalian 116024,China;Shenyang Blower Group Co.,Ltd.,Liaoning Shenyang 110869,China)
出处
《机械设计与制造》
北大核心
2025年第6期197-202,209,共7页
Machinery Design & Manufacture
基金
辽宁省教育厅2022年基本科研项目(LJKMZ20222111)
辽宁省自然科学基金项目(2022-MS-145)。
关键词
自由曲面
直纹面
直纹面转化
气动性能
低能流体区
马赫数
流量系数
Arbitrary Surface
Ruled Surface
Transformed Into Ruled Surface
Aerodynamic Performance
Low Vel-ocity Fluid Zone
Mach Number
Flow Coefficient
作者简介
魏国家(1972-),男,辽宁沈阳人,硕士研究生,教授级高级工程师,主要研究方向:离心压缩机设计与制造、机械制造及其自动化等;魏兆成(1981-),男,江苏盐城人,博士研究生,副教授,博导,主要研究方向:智能制造、高性能制造。
