CHINESE JOURNAL OF ENERGETIC MATERIALS
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煤油凝胶液滴破碎时空特性实验研究
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作者单位:

(南京理工大学机械工程学院, 江苏 南京 210094)

作者简介:

曹钦柳(1993-),男,博士生,主要从事凝胶推进剂的雾化与燃烧。e-mail: 115101000190@njust.edu.cn 通信联系人: 封锋(1982-),男,副教授,主要从事膏体(凝胶)推进技术研究。e-mail: nust203@aliyun.com

通讯作者:

封锋(1982-),男,副教授,主要从事膏体(凝胶)推进技术研究。e-mail: nust203@aliyun.com

基金项目:

航天科技创新基金(CASC03-02); 中央高校基本科研业务费专项基金(30920140112001); 江苏省普通高校学术学位研究生科研创新计划(KYLX16_0474)


Temporal and Spatial Characteristics of Gelled Kerosene Droplet Breakup
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(School of Mechanical Engineering, NUST, Nanjing 210094, China)

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    摘要:

    为了探究煤油凝胶液滴破碎的时间和空间分布特性,采用高速摄像机拍摄破碎过程,获得在不同气流速度下煤油凝胶液滴的破碎特征、流动参数对破碎时间和破碎区域的影响。结果表明:随着韦伯数 (We) 增大,煤油凝胶液滴依次发生与煤油 (牛顿流体) 液滴相同的破碎模态,且模态转换We随着胶凝剂含量的增加而提高。三种煤油凝胶的总破碎时间和初始破碎时间的比值 (Ttot/Tini) 均随奥内佐格数 (Oh) 的升高而降低,且均趋近于牛顿流体的该值 (3.125)。在破碎结束时,横向破碎区域随着We数的升高而扩大,且胶凝剂含量越低范围越大; 纵向破碎区域随着We数升高会扩大到一个极值,胶凝剂含量为1%和2%的煤油凝胶,破碎区域和初始液滴直径的比值趋于20,胶凝剂含量为3%时,该值趋近17。

    Abstract:

    In order to investigate the temporal and spatial distribution characteristics of gelled kerosene, a high speed camera was used to shoot the breakup process. The breakup characteristics of gelled kerosene at various gas velocities, the effects of flow parameters on breakup time and breakup region were obtained. Results indicate that the same breakup morphology as kerosene (Newtonian fluid) droplet occurs to gelled kerosene droplet with the increase of Weber number (We) and the transition We elevates with the increase of gellant content. For each kind of gelled kerosene, the ratio of total breakup time and initial breakup time (Ttot/Tini) decreases with the increase of Ohnesorge number (Oh) and tends towards the value of Newtonian fluid (3.125). At the end of breakup, streamwise breakup region widens with the increase of We and the region is wider with the lower gellant content. Cross-stream breakup region widens to a maximum value with the increase of We number. The ratio of cross-stream breakup region and initial diameter tends towards 20 for the gelled kerosene of 1% and 2% gellant content, while the value tends to 17 when gellant content is 3%.

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引用本文

曹钦柳,封锋,邓寒玉.煤油凝胶液滴破碎时空特性实验研究[J].含能材料, 2017, 25(4):342-347. DOI:10.11943/j. issn.1006-9941.2017.04.012.
CAO Qin-liu, FENG Feng, DENG Han-yu. Temporal and Spatial Characteristics of Gelled Kerosene Droplet Breakup[J]. Chinese Journal of Energetic Materials, 2017, 25(4):342-347. DOI:10.11943/j. issn.1006-9941.2017.04.012.

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历史
  • 收稿日期: 2016-11-07
  • 最后修改日期: 2017-01-12
  • 录用日期: 2017-01-19
  • 在线发布日期: 2017-04-26
  • 出版日期: 2017-04-27