Transported Joint Probability Density Function Simulation of Turbulent Spray Flames Combined with a Spray Flamelet Model Using a Transported Scalar Dissipation Rate
Transported Joint Probability Density Function Simulation of Turbulent Spray Flames Combined with a Spray Flamelet Model Using a Transported Scalar Dissipation Rate
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DOI：
10.1080/00102202.2016.1214584
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发表时间：
2017-01-01
影响因子：
1.9
通讯作者：
Gutheil, Eva
中科院分区：
文献类型：
--
作者：
Hu, Yong;Olguin, Hernan;Gutheil, Eva
采用联合气体混合分数-焓概率密度函数（PDF）和喷雾小火焰模型相结合的方法对湍流乙醇/空气喷雾火焰进行了数值模拟，其中混合分数的标量耗散率用输运方程描述。通过对乙醇/空气燃烧的38种物质和337个基元反应的详细反应机理进行逆流层流喷雾火焰的预先计算，将喷雾蒸发纳入小火焰模型中。导出了考虑喷雾蒸发的混合分数的平均标量耗散率的输运方程。计算结果与A. Masri，悉尼大学，澳大利亚.所有主要的喷雾火焰特性，包括Sauter平均直径，液滴速度，其湍流波动以及气体温度，一般表现出良好的协议与实验。不同的模型的标量耗散率的混合物分数是没有显着不同的考虑中的火焰，除了内部的化学反应区，其中新的模型显示出一些改进相比，实验。
Numerical simulations of a turbulent ethanol/air spray flame are performed using a combined formulation of a joint gas mixture fraction-enthalpy probability density function (PDF) and a spray flamelet model, where the scalar dissipation rate of the mixture fraction is described with a transport equation. Spray evaporation is included in the flamelet model through the pre-calculation of counterflowing laminar spray flames with a detailed reaction mechanism of 38 species and 337 elementary reactions for ethanol/air combustion. A transport equation for the mean scalar dissipation rate of the mixture fraction is derived, taking into account the spray evaporation. The computed results are compared with the experimental data provided by A. Masri, University of Sydney, Australia. All major spray flame characteristics, including the Sauter mean diameter, the droplet velocity, and its turbulent fluctuations as well as gas temperature, generally show good agreement with experiments. Different models for the scalar dissipation rate of the mixture fraction are not significantly different for the flame under consideration except for inside the chemical reaction zone, where the new model shows some improvement compared to the experiment.