Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (3): 73-77.doi: 10.3969/j.issn.1000-565X.2011.03.015

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Experimental Investigation into Small-Scale Jet Diffusion Flame Structure

Gan Yun-hua1  Song Jing-dong2  Yang Ze-liang1  Jiao Ming-lun1  Zheng Hao1   

  1. 1. South China university of technology electricity institute, guangdong guangzhou 510640; 2. Northeast dianli university graduate department, jilin jilin 132012
  • Received:2010-06-17 Revised:2010-08-07 Online:2011-03-25 Published:2011-02-01
  • Contact: 甘云华(1979-)，男，博士，副教授，主要从事微小尺度传热与燃烧等研究 E-mail:ganyh@scut.edu.cn
  • About author:甘云华(1979-)，男，博士，副教授，主要从事微小尺度传热与燃烧等研究
  • Supported by:

    国家自然科学基金资助项目(50806022)；华南理工大学中央高校基本科研业务费专项资金资助项目(2009ZM0031)

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Abstract:

 Comparative experiments between small-scale free jet diffusion combustion and the confined jet one were performed from a circular ceramic burner with the inner diameter of 1.0mm,using liquid ethanol as the fuel.A transparent glass tube with an inner diameter of 8.8mm was put outside the ceramic tube to form a confined space.The structure of the flames in steady combustion was then measured with optical visualization method.The results indicate that the free jet diffusion flames are ellipsoidal while the confined ones are tapered,that the length and width of confined jet diffusion flames are both less than those of free jet flames at the same ethanol flowrate,that the mi-xing of fuel and air in confined space is better than that in free space,and that the structure of confined jet di-ffusion flames is more sensitive to the buoyancy.

Key words: microscale combustion, confined jet flow, diffusion flame, flame structure