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Numerical simulation of the reactive two-phase flow in a kerosene/air tubular combustor

机译：煤油/空气管燃烧器中反应性两相流的数值模拟

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Numerical simulation plays today an important role in the design of gas turbine combustors. It requires the understanding of basic physical phenomena encountered in turbulent and reactive flows. In most industrial applications concerning airbreathing propulsion, the fuel is injected in the liquid phase which often consists of a spray of fine droplets. This paper presents numerical simulations of the flowfield, inside a realistic tubular-type combustion chamber geometry, taking into account the interaction between the liquid droplets and the gaseous phase. The in-house ONERA's numerical code MSD was used to compute the turbulent reactive two-phase flow inside this 3D flame tube. In order to promote the liquid spray dispersion in the flow, the kerosene/air mixture is injected through a swirling injection system. A Lagrangian approach has been implemented in order to describe with good accuracy the droplet behaviour. This Lagrangian approach is numerically coupled with the Eulerian formulation describing the gaseous flow. Droplet dispersion induced by the turbulence of the flow is governed by probabilistic models taking into account the local turbulence conditions controlled by a two-equation κ-ε model. Results are presented showing the influence of the prescribed swirl intensity on the global flow features. This investigation eventually helped us in finding the most appropriate conditions for future experimental testings.
机译：今天，数值模拟在燃气轮机燃烧室的设计中起着重要作用。它需要了解湍流和反应流中遇到的基本物理现象。在大多数涉及呼吸推进的工业应用中，燃料以液相喷射，该液相通常由细小液滴的喷雾组成。本文考虑了液滴与气相之间的相互作用，对真实的管状燃烧室几何形状内部的流场进行了数值模拟。内部ONERA的数字代码MSD用于计算3D火焰管内部的湍流反应性两相流。为了促进液体喷雾在流中的分散，通过旋转注入系统注入煤油/空气混合物。为了精确描述液滴的行为，已经采用了拉格朗日方法。这种拉格朗日方法在数值上与描述气体流动的欧拉公式耦合。由湍流引起的液滴弥散由概率模型控制，该模型考虑了由两方程κ-ε模型控制的局部湍流条件。结果显示了规定的旋流强度对整体流动特征的影响。这项调查最终帮助我们找到了将来进行实验测试的最合适条件。

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