带拐弯混合管对波瓣混合器性能的影响

叶宇琛; 黄勇; 刘磊; 魏福清

doi:10.13224/j.cnki.jasp.2015.05.012

带拐弯混合管对波瓣混合器性能的影响

doi: 10.13224/j.cnki.jasp.2015.05.012

叶宇琛^1,2,
黄勇^1,2,
刘磊^1,2,
魏福清^1,2

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;
2. 先进航空发动机协同创新中心, 北京 100191

详细信息

作者简介:
叶宇琛(1987-),男,福建莆田人,硕士生,主要从事红外隐身研究.

中图分类号: V231.3
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- 文章访问数: 965
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- 被引次数: 0
出版历程
- 收稿日期: 2013-12-03
- 刊出日期: 2015-05-28

Effects of turning mixing duct on lobed mixer performance

1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China

摘要

摘要: 针对波瓣混合器进行了一系列的数值计算和模型实验研究,揭示了带拐弯混合管对波瓣混合器性能的影响.实验结果表明:混合管长径比小于2时,带拐弯混合管会造成高温气流在出口截面呈月牙形分布,月牙形包围着一个回流区,该回流现象对引射性能不利,计算结果则验证了该气流分布,认为带拐弯混合管降低了波瓣混合器的引射效率,为改善其引射性能,应该加长混合管使得混合管的长径比大于等于2.计算结果还发现了波瓣混合器的最佳长径比为2,且该值不随面积比变化,和最佳长径比为6的圆管混合器相比,波瓣混合器可以有效缩短混合管的长度.另外,进一步给出了引射比与长径比的拟合关系式.
- 波瓣混合器 /
- 带拐弯混合管 /
- 引射比 /
- 最佳长径比 /
- 面积比
Abstract: Based on a series of numerical computations and model experiments on the lobed mixer, the effects of turning mixing duct on the lobed mixer performance were revealed. The experimental results show that a crescent-shaped high temperature flow area is formed at the outlet cross section caused by turning mixing duct if the length-diameter ratio of mixing duct is less than 2. And a backflow zone is also found in the center of this area which is disadvantageous to the pumping performance. However, the numerical results not only verify the air flow distribution, but also show that the turning mixing duct lower the pumping efficiency of lobed mixer, and the mixer duct length should be increased for better pumping performance. To achieve a satisfied lobed mixer performance, the length-diameter ratio should not be less than 2. The numerical results also show that the optimum length-diameter ratio of lobed mixer is 2, which may not vary with the area ratio. Compared with pipe mixer whose optimum length-diameter ratio is 6, the lobed mixer could shorten the mixing duct effectively. Furthermore, fitting relations between the pumping ratio and length-diameter ratio are also presented.
- lobed mixer /
- turning mixing duct /
- pumping ratio /
- optimum length-diameter ratio /
- area ratio

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参考文献(18)

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