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| LESS燃烧室非定常旋流流动 | |
| 引用本文： | 秦皓,丁志磊,李海涛,林宇震,李继保. LESS燃烧室非定常旋流流动[J]. 航空动力学报, 2015, 30(7): 1566-1575. DOI: 10.13224/j.cnki.jasp.2015.07.005 |
| 作者姓名： | 秦皓 丁志磊 李海涛 林宇震 李继保 |
| 作者单位： | 1. 北京航空航天大学 能源与动力工程学院 航空发动机气动热力国家级重点实验室, 北京 100191; |
| 摘 要： | 结合实验和CFD数值方法,研究了LESS燃烧室旋流器出口附近的非定常流动特征.一维热线测试结果表明:预燃级出口存在着2249Hz周期性速度振荡,而主燃级出口流动未见明显脉动.通过瞬态LES数值结果检验了在旋流器出口附近采用一维热线测量三维流动速度偏差为8%.另外,数值模拟计算得出预燃级出口速度脉动频率为2331Hz,与热线测试结果偏差为3.6%.最后通过频谱分析和相关性分析,得出周期性速度脉动由预燃级内进动涡核主导. |
| 关 键 词： | 速度振荡 旋涡结构 旋流流动 非定常 燃烧不稳定性 |
| 收稿时间： | 2014-01-08 |
Unsteady swirling flow in low emissions stirred swirls combustor |
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| QIN Hao,DING Zhi-lei,LI Hai-tao,LIN Yu-zhen and LI Ji-bao. Unsteady swirling flow in low emissions stirred swirls combustor[J]. Journal of Aerospace Power, 2015, 30(7): 1566-1575. DOI: 10.13224/j.cnki.jasp.2015.07.005 | |
| Authors: | QIN Hao DING Zhi-lei LI Hai-tao LIN Yu-zhen LI Ji-bao |
| Affiliation: | 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics of Astronautics, Beijing 100191, China;2. Commercial Aircraft Engine Company Limited, Aviation Industry Corporation of China, Shanghai 200241, China |
| Abstract: | The unsteady flow characteristics of low emissions stirred swirls (LESS) combustor swirlers outlet were studied, in combination with experiments and CFD calculation. One-dimensional hotwire tests results show periodic velocity oscillations of 2249Hz existed in the flow field of pilot stage outlet, but didn't appear at main stage outlet. Transient large eddy simulation (LES) calculation had been adopted to verify that velocity at swirlers outlet tested by one-dimensional hotwire has a difference of 8% to real three-dimensional flow. And the simulation results show periodic velocity oscillations of 2331Hz with a difference of 3.6% to experiments. The periodic velocity oscillation phenomenon is dominated by processing vortex core movement in pilot through spectrum analysis and correlation analysis. |
| Keywords: | velocity oscillation vortex structure swirling flow unsteady combustion instability |
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