Stationary ethylene-air edge flames in a wedge-shaped region at low and high strain rates

被引:1
|
作者
Shields, Ben [1 ]
Freund, Jonathan B. [2 ]
Pantano, Carlos [3 ]
机构
[1] Univ Illinois, Mech Sci & Engn, Urbana, IL USA
[2] Univ Illinois, Aerosp Engn, Urbana, IL USA
[3] Univ Southern Calif, Aerosp & Mech Engn, Los Angeles, CA 90007 USA
关键词
edge flame; ethylene; detailed chemistry; eigenvalue problem; flame speed;
D O I
10.1080/13647830.2021.1900921
中图分类号
O414.1 [热力学];
学科分类号
摘要
Edge flames are a canonical two-dimensional flame structure appearing in lifted jet flames and in the growth and repair of flame holes in nonpremixed turbulent combustion. Computational studies of edge flames with hydrodynamic-coupling at high strains are difficult owing to difficulties defining a stationary state. A wedge-shaped counterflow configuration is here used to provide control over the position of the edge flame, and allowing access to stationary, hydrodynamically-coupled retreating flames (at low and high strains). ethylene-air edge flames are established in the resulting non-uniformly strained counterflow, with combustion modeled using a skeletal reduction of the USC Mech II. The details of the ethylene-air edge flame are discussed, and comparisons are made between stoichiometric, fuel-lean, and fuel-rich compositions. Mixture-fraction-based coordinates local to the flame front are developed and analysed for a range of edge-flame speeds and compositions. A strain-rate parameter is described that admits a speed-strain relationship that is insensitive to the mixture stoichiometry, and a model for retreating flame speeds at high strain rates is discussed.
引用
收藏
页码:1039 / 1063
页数:25
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