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首页> 外文会议>Joint Meeting of the US Sections of the Combustion Institute >'One-Dimensional Turbulence' Simulation of Turbulent Jet Diffusion Flames: Model Formulation and Illustrative Applications
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'One-Dimensional Turbulence' Simulation of Turbulent Jet Diffusion Flames: Model Formulation and Illustrative Applications

机译：湍流喷射扩散火焰的“一维湍流”模拟：模型配方和说明性应用

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摘要

A novel modeling approach to the simulation of turbulent jet diffusion flames based on the One-Dimensional Turbulence (ODT) model is presented. The approach is based on the mechanistic distinction between molecular processed (reaction and diffusion), implemented by the direct solution of unsteady boundary-layer reaction-diffusion equations, and turbulent advection in a time-resolved simulation on a 1D domain. The 1D domain corresponds to a direction transverse to the mean flow of the jet. Temporal simulations of jet diffusion flames are performed to illustrate the model's predictions of turbulence-chemistry interactions in jet diffusion flames. ODT predictions of flow entrainment, finite-rate chemistry and differential diffusion effects are investigated in hydrogen-air diffusion flames at two Reynolds numbers. Two-dimensional renderings of stirring events from a single realization show that ODT reproduces a number of salient features of simple developing turbulent shear flows that reflect the growth of the boundary layer and the mechanisms of turbulence cascade and spatial intermittency. Multiple realizations of jet simulations are used to compute axial and conditional statistics of streamwise velocity, major species, NO and temperature. Comparison with experimental measurements indicates that chemical properties of interest can be captured by a model that involves a simplified representation of the flow structure. The results show strong differential diffusion effects in the near field, with attenuation farther downstream.
机译：提出了一种基于一维湍流（ODT）模型的湍流射流扩散火焰模拟模拟的新型建模方法。该方法基于分子处理（反应和扩散）之间的机械区分，由不稳定的边界层反应扩散方程的直接解，以及在1D域的时间分辨模拟中的湍流平流。 1D结构域对应于横向于射流的平均流动的方向。进行射流扩散火焰的时间模拟以说明模型的湍流 - 化学相互作用在射流扩散火焰中的预测。在两个雷诺数的氢气扩散火焰中研究了流夹带，有限速率化学和差分扩散效果的ODT预测。从单一实现的搅拌事件的二维效果表明，ODT再现了许多简单的开发湍流剪切流的突出特征，这些湍流剪切流量反映了边界层的生长和湍流级联和空间间歇性的机制。对喷射模拟的多次实现用于计算流速，主要物种，不和温度的轴向和条件统计。与实验测量的比较表明，可以通过涉及流动结构的简化表示的模型来捕获感兴趣的化学性质。结果表明，近场近端的强差分扩散效应，衰减进一步下游。

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