Flame Structure of a Jet Flame with Penetration of Side Micro-jets

›› 2008, Vol. 16 ›› Issue (6): 861-866.

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

曹玉春¹, 吴金星¹, 米建春², 周钰³

1. School of Chemical Engineering, Zhengzhou University, Henan 450001, China;
2. College of Engineering, Peking University, Beijing 100871, China;
3. Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China

收稿日期:2008-03-26 修回日期:2008-09-27 出版日期:2008-12-28 发布日期:2008-12-28
通讯作者: CAO Yuchun,E-mail:yuchun_cao@zzu.edu.cn
基金资助:
Supported by the Natural Science Foundation of Henan Province (20074800060)

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

CAO Yuchun¹, WU Jinxing¹, MI Jianchun², ZHOU Yu³

1. School of Chemical Engineering, Zhengzhou University, Henan 450001, China;
2. College of Engineering, Peking University, Beijing 100871, China;
3. Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China

Received:2008-03-26 Revised:2008-09-27 Online:2008-12-28 Published:2008-12-28
Supported by:
Supported by the Natural Science Foundation of Henan Province (20074800060)

摘要/Abstract

摘要： In this paper,an innovative jet lifted flame with side micro-jets has been proposed and its effects on the flame structure have also been investigated.Due to the changes of the initial combustion conditions,mixing and aerodynamics which resulted from the perturbation of the side micro-jets,such a lifted jet flame has different flame structure compared with the common premixed flame.Results demonstrate that use of the micro-jets can control,to a certain extent,the flame structure,including the flame length,lift-off distance and blow-off limit.With the same fuel and air flow rate,the flame length with the side micro-jets will decrease about 5%-40% as the air volume ratio αincreases from 58%-76%.Compared with the common diffusion flame,the jet flame with the side micro-jets demonstrates to be easier to be a momentum-dominated flame.The flame length with 2 micro-jets is about 5% less than with 6 micro-jets under the same fuel and air flow rate.With the sameα,the fewer number of the controlled jets lead to the flame with relatively shorter length,not easier to be blown off and higher NO_x emission.With certain fuel flow rate,the critical air volume ratio is largest for the flame with 3 micro-jets,which is more difficult to be blown off than the cases with 2,4 or 6 micro-jets.

关键词: jet flame, side micro-jets, perturbation, flame structure

Abstract: In this paper,an innovative jet lifted flame with side micro-jets has been proposed and its effects on the flame structure have also been investigated.Due to the changes of the initial combustion conditions,mixing and aerodynamics which resulted from the perturbation of the side micro-jets,such a lifted jet flame has different flame structure compared with the common premixed flame.Results demonstrate that use of the micro-jets can control,to a certain extent,the flame structure,including the flame length,lift-off distance and blow-off limit.With the same fuel and air flow rate,the flame length with the side micro-jets will decrease about 5%-40% as the air volume ratio αincreases from 58%-76%.Compared with the common diffusion flame,the jet flame with the side micro-jets demonstrates to be easier to be a momentum-dominated flame.The flame length with 2 micro-jets is about 5% less than with 6 micro-jets under the same fuel and air flow rate.With the sameα,the fewer number of the controlled jets lead to the flame with relatively shorter length,not easier to be blown off and higher NO_x emission.With certain fuel flow rate,the critical air volume ratio is largest for the flame with 3 micro-jets,which is more difficult to be blown off than the cases with 2,4 or 6 micro-jets.

Key words: jet flame, side micro-jets, perturbation, flame structure

曹玉春, 吴金星, 米建春, 周钰. Flame Structure of a Jet Flame with Penetration of Side Micro-jets[J]. , 2008, 16(6): 861-866.

CAO Yuchun, WU Jinxing, MI Jianchun, ZHOU Yu. Flame Structure of a Jet Flame with Penetration of Side Micro-jets[J]. , 2008, 16(6): 861-866.

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Flame Structure of a Jet Flame with Penetration of Side Micro-jets

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

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