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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >The flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow
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The flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow

机译：具有同流的同心流锥形喷嘴燃烧器中高度稳定的部分预混火焰的流场结构

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The stability limits, the stabilization mechanism, and the flow field structure of highly stabilized partially premixed methane flames in a concentric flow conical nozzle burner with air co-flow have been investigated and presented in this work. The stability map of partial premixed flames illustrates that the flames are stable between two extinction limits. A low extinction limit when partial premixed flames approach non-premixed flame conditions, and a high extinction limit, with the partial premixed flames approach fully premixed flame conditions. These two limits showed that the most stable flame conditions are achieved at a certain degree of partial premixed. The stability is improved by adding air co-flow. As the air co-flow velocity increases the most stable flames are those that approach fully premixed. The turbulent flow field of three flames at 0, 5, 10 m/s co-flow velocity are investigated using Stereo Particle Image Velocimetry (SPIV) in order to explore the improvement of the flame stability due to the use of air co-flow. The three flames are all at a jet equivalence ratio (Phi(j)) of 2, fixed level of partial premixing and jet Reynolds number (Re-j) of 10,000. The use of co-flow results in the formation of two vortices at the cone exit. These vortices act like stabilization anchors for the flames to the nozzle tip. With these vortices in the flow field, the reaction zone shifts toward the reduced turbulence intensity at the nozzle rim of the cone. Interesting information about the structure of the flow field with and without co-flow are identified and reported in this work. (C) 2015 Elsevier Inc. All rights reserved.
机译：在同流锥形同心锥形喷嘴燃烧器中，研究了高稳定度的部分预混甲烷火焰的稳定性极限，稳定机理和流场结构，并进行了研究。部分预混火焰的稳定性图表明，火焰在两个消光极限之间是稳定的。当部分预混火焰接近非预混火焰条件时，消光极限低，而部分预混火焰接近完全预混火焰条件，则消光极限高。这两个极限表明，在一定程度的部分预混下，可获得最稳定的火焰条件。通过增加气流可以提高稳定性。随着空气同流速度的增加，最稳定的火焰是接近完全预混合的火焰。使用立体粒子图像测速技术（SPIV）研究了三种火焰在0、5、10 m / s共流速度下的湍流场，以探讨由于使用空气同流而改善了火焰稳定性。这三个火焰的射流当量比（Phi（j））均为2，部分预混的固定水平和射流雷诺数（Re-j）为10,000。顺流的使用导致在圆锥形出口处形成两个涡流。这些涡流就像火焰的稳定锚一样作用在喷嘴头上。在流场中存在这些涡流时，反应区会向锥体喷嘴边缘处减小的湍流强度移动。在这项工作中，确定并报告了有关带有或不带有同流的流场结构的有趣信息。 （C）2015 Elsevier Inc.保留所有权利。

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