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首页> 外文期刊>Combustion Science and Technology >PROPERTIES OF FLAMES PROPAGATING IN PROPANE-AIR MIXTURES NEAR FLAMMABILITY AND QUENCHING LIMITS
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PROPERTIES OF FLAMES PROPAGATING IN PROPANE-AIR MIXTURES NEAR FLAMMABILITY AND QUENCHING LIMITS

机译：丙烷-空气混合物中易燃性和淬火极限附近的火焰传播特性

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摘要

Flammability limits and flame quenching in a narrow channel were studied during flame propagation in propane/air mixtures. Most of the experiments were carried out in a vertical, square (50 mm x 50 mm) flammability tube 1.8 m long and in a wedge-shaped quenching channel. Some new details of the extinction mechanism of lean limit upward and downward propagating flames (Le > 1) in a vertical tube were deduced using schlieren and direct light photography, temperature measurements, and transient phenomena observations. Behavior and properties of the upward propagating rich flames (Le < 1) were also studied. Additionally, flame quenching in a narrow channel for upward and downward propagating flames was examined over the entire range of mixture composition. Reliable data related to flammability limits and quenching distance were obtained. The quenching distance appeared to be twice as wide as the flame thickness. The Peclet number, expressed by the quenching distance and laminar burning velocity, is constant and equal to Pe_D ≈ 42. Flames propagating upward in very rich mixtures are characterized by substantial flame thickness and small laminar burning velocity. The flame front of such flames contains several luminous zones (cool flames). In the hottest part of the flame soot is produced.
机译：在丙烷/空气混合物中的火焰传播过程中，研究了狭窄通道中的可燃极限和火焰猝灭。大多数实验是在长1.8 m的垂直方形（50 mm x 50 mm）可燃管中并在楔形淬火通道中进行的。垂直线管中稀薄极限向上和向下传播火焰（Le> 1）的消光机理的一些新细节是使用席勒（Schlieren）和直接光摄影，温度测量以及瞬态现象观察得出的。还研究了向上传播的富火焰（Le <1）的行为和特性。另外，在混合物组成的整个范围内检查了在狭窄通道中用于向上和向下传播的火焰的火焰猝灭。获得了有关易燃极限和淬火距离的可靠数据。淬火距离似乎是火焰厚度的两倍。 Peclet数由淬火距离和层流燃烧速度表示，是恒定的，等于Pe_D≈42。在非常丰富的混合物中向上传播的火焰的特征在于，火焰厚度大，层流燃烧速度小。此类火焰的火焰前部包含多个发光区域（冷火焰）。在火焰的最热部分产生。

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