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首页> 外文期刊>Combustion Science and Technology >THREE-DIMENSIONAL STRUCTURES OF FLAMES OVER LIQUID FUEL POOLS
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THREE-DIMENSIONAL STRUCTURES OF FLAMES OVER LIQUID FUEL POOLS

机译：液体燃料池上火焰的三维结构

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Three-dimensional unsteady Navier-Stokes computations have been performed for the ignition and flame propagation above a liquid fuel (propanol) pool in an airflow duct. The article extends the computations of Cai et al. (Combustion Science and Technology, Vol. 174, pp. 5-34, 2002) to include a parameter survey that determines the regimes of pulsating flame spread and uniform flame spread in the initial temperature/opposed air velocity, pool depth, pool width, and oxygen concentration planes. The two flame spread regimes are defined for both earth gravity and microgravity conditions. Pulsating flame spread behavior occurs if the initial liquid temperature and/or the oxygen mass fraction in the incoming airflow is sufficiently low. The roles of surface-tension-driven flow, gas buoyancy, liquid buoyancy, and hot gas expansion are analyzed. The effects of oxygen mass fraction, pool depth, and pool width are evaluated. For narrow pools (2cm), the three-dimensional effects are focused near the poolside edges where the flame front wraps along the poolside edge but remains nearly two-dimensional over most of the pool. For a wider pool (8cm), three-dimensional variations in flame shape occur over much of the pool. The behavior of the flame along the poolside edges differs significantly for earth gravity and microgravity conditions. The supply of oxygen due to buoyancy at the edges is an important factor. Contrary to previous speculation, the existence of a "valley" in the surface temperature profile is not necessary to explain the behavior of pulsating spread.
机译：已经针对气流导管中液体燃料（丙醇）池上方的点火和火焰传播执行了三维非稳态Navier-Stokes计算。本文扩展了Cai等人的计算。 （《燃烧科学与技术》，第174卷，第5-34页，2002年），其中包括一个参数调查，该调查确定了初始温度/相对空气速度，池深，池宽，脉动火焰传播和均匀火焰传播的状态，和氧气浓度平面。针对地球重力和微重力条件定义了两种火焰传播方式。如果初始液体温度和/或进入气流中的氧气质量分数足够低，则会发生脉动火焰扩散行为。分析了表面张力驱动的流量，气体浮力，液体浮力和热气膨胀的作用。评估氧气质量分数，池深度和池宽度的影响。对于狭窄的水池（2厘米），三维效果集中在水池边附近，火焰前缘沿水池边缠绕，但在大多数水池上几乎保持二维。对于较宽的水池（8厘米），火焰形状的三维变化会在水池的大部分区域发生。在地球重力和微重力条件下，火焰沿池畔边缘的行为差异很大。由于边缘处的浮力而产生的氧气供应是重要的因素。与以前的推测相反，表面温度曲线中“谷”的存在对于解释脉动扩散的行为不是必需的。

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