采用多源涡技术强化燃料/空气小尺度混合研究

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基金项目: 航空发动机气动热力科技重点实验室基金

Small scale mixing enhancement of fuel/air using multi-source vortex technology

1.
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2.
Institute of Automation, Naval Academy of Armamet, Beijing 100073, China

摘要: 通过数值模拟,研究了在空气入口总温为294.28 K,燃料气体为乙烷(C₂H₆)时在轴向旋流器出口截面上安装多个小突片的多源涡(MSV)结构对燃烧室内燃料/空气掺混效果的影响.结果表明:在每个小突片下游产生的小尺度流向涡使得局部的燃料/空气掺混加强;装有多源涡结构的燃烧室内对应的C₂H₆质量分数在文氏管下游2 mm截面上的混合不均匀度由不带多源涡结构时的13.0%下降到小于7.4%.在该研究的范围内,当小突片总的阻塞比增大时,对应的混合不均匀度减小,掺混效果变好.
- 燃烧室 /
- 轴向旋流器 /
- 多源涡 /
- 强化混合 /
- 小突片
Abstract: With the multi-source vortex(MSV) structure fixed on the exit plane of axial swirler,the flow field of combustor was simulated and the effect of MSV on the mixing enhancement of fuel/air was studied.The total temperature of the air inlet was 294.28K and the fuel was ethane(C₂H₆).The results indicate that,a small scale streamwise vortex is produced downstream each tab,helping enhance the local mixing of fuel and air.The mixing non-uniformity is 13.0% for combustor without MSV,while it declines to smaller than 7.4% with MSV.The mixing non-uniformity decreases when the total blockage of tabs increases,indicating a mixing enhancement of fuel/air.
- combustor /
- axial swirler /
- multi-source vortex(MSV) /
- mixing enhancement /
- tab

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