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Experimental and numerical study on the flame root of premixed flame after a small size V-gutter(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2021年03期
Page:
16-25
Research Field:
研究与设计
Publishing date:

Info

Title:
Experimental and numerical study on the flame root of premixed flame after a small size V-gutter
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
Keywords:
flame stabilization;  V-gutter;  flame root;  small size;  blowout
PACS:
V430
DOI:
-
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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