图书馆订阅: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

EXPERIMENTAL STUDY OF A TURBULENT V-SHAPED FLAME STABILIZED IN A STRATIFIED FLOW

pages 1007-1012
DOI: 10.1615/TSFP3.1680
Get accessGet access

摘要

The experimental work presented in this paper deals with the analysis of a premixed flame propagating in a non-homogeneous concentration field. The purpose is to characterize the effect of the stratification on the topology, structure and propagation speed of the flame front. The arrangement consists in a stationnary V-shaped flame, stabilized on a rod and expanding in a lean premixed CH4/air flow. The interaction between the oblique front and the stratified slice, which equivalence ratio is close to one and size is larger than the flame front thickness, is investigated in both the laminar and turbulent cases. Techniques such as PIV and CH* chemiluminescence are used in order to describe the instantaneous fields. Measurements by LDA, thermocouple and a concentration probe provide informations on the mean fields. Highlighted by a comparison with the homogeneous cases, the data point out numerous interesting results. First, concerning the laminar case, a particular shape of the flame front, called "pensinsula", has been observed. This behaviour is linked to a specific evolution of the burning velocity in the statified slice. Second, the turbulent analysis have emphasized a new evolution of the velocity field, strongly deflected in burned gases behind the stratified front. This global approach has been related to temperature and CH* emission results. Three peaks profiles, reveal that at least a "secondary" reaction zone is involved in the interaction process.

Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集 订购及政策 Begell House 联系我们 Language English 中文 Русский Português German French Spain