| 摘要: |
| 为了探索串列叶轮的设计方法和实际应用，在常规离心叶轮的基础上，利用轴流压气机和离心叶片设计方法实现了串列叶轮设计，借助经过校核的数值模拟手段，对带串列叶轮的离心压气机内部流动进行了详细数值模拟，研究了诱导轮和导风轮之间相对周向位置对串列叶轮内部流场及气动性能的影响。研究表明:串列叶轮的引入能够不同程度改善离心压气机性能，且诱导轮与导风轮之间的相对周向位置对气动性能具有较大的影响，在[λs]=25%周向相对位置下，串列叶轮的引入使得压气机级综合裕度和峰值效率分别提高了1.3%和1.4%。与常规叶轮相比，合理布局的串列叶轮能够有效控制离心叶轮内部附面层的发展并改善离心叶轮内部流场特性以及离心叶轮出口流场品质，从而有效提高高压比离心压气机的性能和稳定工作裕度。 |
| 关键词: 高压比离心压气机 串列叶轮 周向相对位置 数值模拟 |
| DOI： |
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| 基金项目:国家自然科学基金(51476166)。 |
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| Mechanism of Highly-Loaded Centrifugal Compressor Stage with Tandem Impeller |
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LI Zi-liang1,2,LU Xin-gen1,ZHANG Yan-feng1,HAN Ge1,HAN Jian-tao1,2,ZHU Jun-qiang1
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(1. Key Laboratory of Light-Duty Gas-Turbine，Institute of Engineering Thermophysics，
Chinese Academy of Sciences，Beijing 100190，China;2. University of Chinese Academy of Sciences，Beijing 100049，China)
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| Abstract: |
| In order to advance the understanding of the fundamental mechanism of tandem impeller， a highly loaded centrifugal compressor stage with impeller of conventional design and various tandem clocking designs was investigated at design speed numerically. The tandem impeller was designed using advanced axial compressor cascade and ruled surface impeller design methods based on a conventional impeller. Comparison and analysis for the performance and flow field between different impeller configurations showed that tandem design and clocking position had great influence on the performance of compressor. The tandem-impeller compressor with 25% clocking fraction increases the stall margin and peak efficiency by 1.3% and 1.4%， respectively. Appropriate tandem design can inhibit the boundary layer development and improve of the non-uniform flow field at impeller outlet， both of which contributed to the gain of the efficiency and stall margin of centrifugal compressor. |
| Key words: Highly-loaded centrifugal compressor Tandem impeller Clocking arrangement Numerical simulation |
