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[1]巩 帆,黄 勇,王宗伟,等.小尺寸钝体稳定预混火焰根部的实验和仿真[J].火箭推进,2021,47(03):16-25.
　GONG Fan,HUANG Yong,WANG Zongwei,et al.Experimental and numerical study on the flame root of premixed flame after a small size V-gutter[J].Journal of Rocket Propulsion,2021,47(03):16-25.
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小尺寸钝体稳定预混火焰根部的实验和仿真

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V] 卷: 47 期数: 2021年03期 页码: 16-25 栏目: 研究与设计 出版日期: 2021-06-30
Title:
Experimental and numerical study on the flame root of premixed flame after a small size V-gutter
文章编号:
1672-9374(2021)03-0016-10
作者:
巩 帆1; 黄 勇2; 王宗伟1; 常志鹏1; 刘 筑1
1.空间物理重点实验室,北京 100076; 2.北京航空航天大学 能源与动力工程学院,北京 100191
Author(s):
GONG Fan1; HUANG Yong2; WANG Zongwei1; CHANG Zhipeng1; LIU Zhu1
1.Science and Technology on Physics Laboratory,Beijing 100076,China2.School of Energy and Power Engineering,Beihang University,Beijing 100191,China
关键词:
火焰稳定;  V型钝体;  火焰根部;  小尺寸;  吹熄
Keywords:
flame stabilization;  V-gutter;  flame root;  small size;  blowout
分类号:
V430
文献标志码:
A
摘要:
燃烧室内火焰稳定性对于冲压发动机、涡轮机和加力燃烧室至关重要,而火焰稳定机理是燃烧室稳定性设计的重要参考。从火焰传播和稳定机理来看火焰根部是重要影响因素,而传统火焰稳定性的研究着重关注较大尺寸的钝体,对于小尺寸钝体的研究很少,重在研究小尺寸钝体后火焰稳定特性,研究对象为一个二维贫油甲烷预混火焰。在实验中,钝体尺寸为5 mm,Re数范围是126～315,进口来流速度和当量比分别调节,以观察火焰根部特性随相关参数的变化情况。当进口速度增加,火焰根部向下游移动; 当当量比减小,火焰根部同样向下游移动。在仿真中,钝体尺寸为1 mm和2 mm,Re数范围是45～250。结果显示,在1 mm钝体后存在一个火焰根部,并随来流速度增加而向下游移动; 在2 mm钝体后存在两个火焰根部,并随来流速度增加向下游移动,并最终合为一个直至发生火焰吹熄。对于小尺寸钝体稳定预混火焰,当火焰临近吹熄发生时,火焰根部均向下游移动,在这个移动过程中火焰根部能有效维持火焰面的传播,直至最终吹熄的发生。通过研究发现的火焰现象可用于支撑未来半经验公式的建立。
Abstract:
Flame stabilization in combustor is very important for the performance of combustors such as ramjet,turbojet or turbofan afterburners,and the flame stabilization mechanism is an important reference for the stability design of combustor.From the perspective of flame propagation and flame stabilization mechanism,the flame root is the key influencing factor.However,the traditional study focuses on larger size gutter,and there are few studies on small size gutter.The objective of this study is to investigate the flame root characteristics after a small V-gutter,and the research object is a two-dimensional lean methane premixed flame.In the experiment,the V-gutter size is 5 mm,and the Re number range is 126～315.The inlet velocity and equivalence ratio are adjusted respectively to obtain the variation of flame root characteristics with related parameters.When the inlet velocity is increased,the flame root moves downstream.When the equivalence ratio of inlet mixture is decreased,the flame root moves downstream.In the numerical simulation,the V-gutter size is 1mm and 2 mm,and the Re number range is 45～250.For the flame root after 1mm V-gutter,there is one flame root,and as the inlet velocity is raised,the flame root moves downstream.For the flame root after 2 mm V-gutter,there are two flame roots,and as the inlet velocity is raised,the flame roots move downstream and finally merge into one flame root until the flame blows out.For the small size V-gutter flame,when the flame is about to blow out,the flame root moves downstream.During this movement,the flame root can effectively sustain the flame propagation until the flame blowout finally occurs.The flame phenomenon found in this study can be used to support the establishment of a semi-empirical formula in the future.

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备注/Memo

收稿日期：2020-08-02; Revised date:2020-08-19
作者简介：GONG Fan(1988—),female, doctor, research area is major in engine performance and combustion.

更新日期/Last Update: 1900-01-01