| 摘要: |
| 时序效应具有改进多级叶轮机效率的潜力。文中在已有认识基础上,对叶排间轴向间距对时序效应影响进行深入的二维非定常数值研究。算例采用1 5级静 动 静布局的涡轮叶栅。结果发现,叶排间轴向间距对时序效应自身影响很大,会使涡轮效率的变化幅度以及效率极值出现的位置发生明显变化。另外,处于两静叶排正中的动叶位置的前后移动或缩短静叶排间的距离均能带来时序效应影响下效率的整体提升。 |
| 关键词: 叶轮 机械 时序效应+ 非定常流 数值仿真 |
| DOI： |
| 分类号:TH122 |
| 基金项目:国家自然科学基金资助项目(50376062);中国科学院知识创新工程项目(KGCX2 301)。 |
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| Numerical investigations for the influence of the axial gap on the use of clocking effect |
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YAN Zhao,JI Lu-cheng,CHEN Jiang
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1.Inst. of Engineering Thermophysics,Academia Sinica, Beijing 100080, China;2.Beijing Full Three Dimension Power Engineering Co. Ltd., Beijing 100080, China
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| Abstract: |
| Clocking effect has great potential in improving the efficiency of turbomachinery. Based on knowledge,2-D unsteady numerical investigations were further performed to understand the influence of axial gap on the use of clocking effect. One 1.5 stage turbine cascade with stator/rotor/stator configuration was adopted as a numerical test case. Results show that different axial gaps do have obvious effects on optimum clocking positions, and the aerodynamic efficiency benefits vary greatly with different axial gaps. Besides, efficiency curves versus clocking positions can be improved globally by changing rotor’s position from the middle of two stator rows or by reducing the distance between two stators in axial direction. |
| Key words: Impeller Machinery Clocking effect~+ Unsteady flow Numerical simulation |
