| 引用本文: | 康忠涛,李清廉,张新桥,等.气液同轴双离心式喷嘴喷雾特性.[J].国防科技大学学报,2014,36(5):50-57.[点击复制] |
| KANG Zhongtao,LI Qinglian,ZHANG Xinqiao,et al.Spray characteristic of gas-liquid double swirl coaxial injector[J].Journal of National University of Defense Technology,2014,36(5):50-57[点击复制] |
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| 气液同轴双离心式喷嘴喷雾特性 |
| 康忠涛1,2, 李清廉1,2, 张新桥1,2, 成鹏1,2 |
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(1.国防科技大学 高超声速冲压发动机技术重点实验室，湖南 长沙 410073;2.
2.国防科技大学 航天科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 采用流体体积方法分析涡流器离心式喷嘴内部流动过程，采用单反相机和相位多普勒测速仪测量离心式喷嘴、气液同轴双离心式喷嘴的喷雾特性。发现涡流器离心式喷嘴内部流动的总压损失主要发生在涡流器槽道入口、收敛段和等直段。等直段使液膜厚度减小，喷雾锥角减小。离心式喷嘴喷雾粒径分布范围沿径向逐渐增加，轴向速度分布范围沿径向先减小后逐渐增加。气液同轴双离心式喷嘴喷雾特性受气液比影响很大，气液比小时旋流空气使喷雾锥角增加，粒径分布范围减小;气液比大时，气体膨胀压缩喷雾，使大液滴能够到达喷雾中心，喷雾外侧为二次雾化成的细小液滴。 |
| 关键词: 气液同轴式喷嘴 双离心 喷雾特性 |
| DOI：10.11887/j.cn.201405009 |
| 投稿日期：2014-01-24 |
| 基金项目:国家自然科学基金资助项目（11472303，11402298）；新世纪优秀人才支持计划（NCET-13-0156） |
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| Spray characteristic of gas-liquid double swirl coaxial injector |
| KANG Zhongtao1,2, LI Qinglian1,2, ZHANG Xinqiao1,2, CHENG Peng1,2 |
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(1.Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China;2.
2.College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The volume of fluid method was used to analyze the flow process in pressure swirl injector. SLR camera and phase doppler anemometry were used to measure the spray characteristics of swirl injector and gas-liquid double swirl coaxial injector. Results show that the total pressure loss occurs mainly in inlet section, convergent section, and columned section of swirler trough. The longer the columned section is, the thicker the liquid film and the smaller the spray cone angle is. The range of spay particle distribution increases gradually along the radial direction while the axial velocity distribution decreases firstly and then increases along radial direction. Spray characteristic of gas-liquid double swirl coaxial injector is greatly influenced by gas-liquid ratio (GLR). While GLR is small enough, swirling air increases the spray cone angle and decreases the range of particle distribution; while GLR is large enough, the expansion of air compresses the spray, pushing large droplets to the center of the spray. And at the edge of spray locates small droplets from second atomization. |
| Keywords: gas-liquid coaxial injector double swirl spray characteristic |
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