| 扩压式叶栅非定常分离流机理研究的频谱分析 |
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| 引用本文： | 陈少龙,侯安平,周盛.扩压式叶栅非定常分离流机理研究的频谱分析[J].航空动力学报,2003,18(3):336-342. |
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| 作者姓名： | 陈少龙 侯安平 周盛 |
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| 作者单位： | 北京航空航天大学,能源与动力工程学院,北京,100083 |
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| 基金项目： | 高等学校博士学科点专项科研基金(2000000615) |
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| 摘 要： | 二维亚音压气机叶栅非定常分离流中旋涡脱落频率的定性研究,采用数值模拟的方法,通过九种不同工况下流场中多点总压值的快速傅立叶分析,初步提出了区分数值振荡和真实物理振荡的判据,同时得到了这九种工况下非定常分离流中旋涡脱落频率的数值模拟结果。证实在非设计工况下,二维亚音压气机叶栅叶背区出现了较大尺度的开式非定常分离,分离区自身及分离流影响的尾迹区的主要运动形式可能是周期性的旋涡脱落。
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| 关 键 词： | 航空、航天推进系统 分离流 旋涡脱落频率 频谱分析 卡门涡街 |
| 文章编号： | 1000-8055(2003)03-0336-07 |
| 收稿时间： | 2002/5/27 0:00:00 |
| 修稿时间： | 2002年5月27日 |
Frequency Domain Analysis of Unsteady Separation Flow in Two Dimensional Subsonic Compressor Cascade |
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| CHEN Shao-long,HOU An-ping and ZHOU Sheng.Frequency Domain Analysis of Unsteady Separation Flow in Two Dimensional Subsonic Compressor Cascade[J].Journal of Aerospace Power,2003,18(3):336-342. |
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| Authors: | CHEN Shao-long HOU An-ping and ZHOU Sheng |
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| Institution: | Beijing University of Aeronautics and Astronautics,Beijing 100083,China;Beijing University of Aeronautics and Astronautics,Beijing 100083,China;Beijing University of Aeronautics and Astronautics,Beijing 100083,China |
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| Abstract: | Numerical simulation was employed for the qualitative research on unsteady vortex shedding frequency in two-dimensional subsonic compressor cascade. Fast Fourier Transform Algorithm was adopted for the value of multi-dots' total pressure in nine different flow conditions. An acceptable criterion is advanced to distinguish the physical oscillation from the numerical oscillation; the vortex shedding frequency in numerical simulation is obtained under the nine different unsteady separated-flow conditions. In non-designed situation, large-dimensional unsteady open separated-flow emerges on the suction surface in two-dimensional subsonic compressor cascade and periodicity vortex shedding might be the primary movement fashion in separated-flow area and wake area dominated by separated-flow. |
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| Keywords: | aerospace propulsion system separated-flow vortex shedding frequency frequency spectrum analysis Karmen Vortex-street |
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