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首页> 外文期刊>Journal of Fluid Science and Technology >Mixing and Combustion Performances of a Baffle-Plate-Type Miniature Confined Multi-Jet
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Mixing and Combustion Performances of a Baffle-Plate-Type Miniature Confined Multi-Jet

机译：折流板式微型密闭多喷嘴的混合和燃烧性能

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摘要

The mixing and combustion performances of a baffle-plate-type millimeter-scale confined multi-jet were investigated experimentally by measuring the blow-off limit of the flames, exhaust gas components and two-dimensional unburned flow velocity profiles in a cylindrical chamber. Two types of multi-jet nozzle, parallel- and swirl-type nozzles, were examined in this study. In the parallel-type case, a small change in the distance between the fuel and air nozzles showed significant effects on the blow-off limit. When the air nozzles were closely located around the center of the chamber, the flame was easily extinguished and a pair of elongated flow recirculation was observed near the chamber sidewalls. When the distance was increased, large-scale reverse flows were observed in the central region that led to a stable and efficient combustion. In the swirl-type case, swirl flows made the flame more stable. Some cases of excessive swirl, however, deteriorate the fuel-and-air mixing performance and increase the CO concentration.
机译：通过测量圆筒形燃烧室中火焰，排气成分和二维未燃烧流速分布的吹扫极限，实验研究了挡板式毫米级密闭多喷嘴的混合和燃烧性能。在这项研究中检查了两种类型的多喷嘴，平行喷嘴和涡旋喷嘴。在并联型情况下，燃油和空气喷嘴之间的距离的微小变化显示了对排放极限的显着影响。当空气喷嘴紧紧围绕腔室中心放置时，火焰很容易熄灭，并且在腔室侧壁附近观察到一对细长的流动再循环。当距离增加时，在中心区域观察到大规模逆流，导致稳定高效的燃烧。在旋流类型的情况下，旋流使火焰更稳定。但是，在某些情况下，涡流过大会降低燃料与空气的混合性能并增加CO浓度。

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