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Advances in Turbulent Combustion Dynamics Simulations in Bluff-Body Stabilized Flames.

机译：钝体稳定火焰中湍流燃烧动力学模拟的进展。

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摘要

This work examines the three main aspects of bluff-body stabilized flames: stationary combustion, lean blow-out, and thermo-acoustic instabilities. For the cases of stationary combustion and lean blow-out, an improved version of the Linear Eddy Model approach is used, while in the case of thermo-acoustic instabilities, the effect of boundary conditions on the predictions are studied. The improved version couples the Linear Eddy Model with the full-set of resolved scale Large Eddy Simulation equations for continuity, momentum, energy, and species transport. In traditional implementations the species equations are generally solved using a Lagrangian method which has some significant limitations. The novelty in this work is that the Eulerian species concentration equations are solved at the resolved scale and the Linear Eddy Model is strictly used to close the species production term.;In this work, the improved Linear Eddy Model approach is applied to predict the flame properties inside the Volvo rig and it is shown to over-predict the flame temperature and normalized velocity when compared to experimental data using a premixed single step global propane reaction with an equivalence ratio of 0.65. The model is also applied to predict lean blow-out and is shown to predict a stable flame at an equivalence ratio of 0.5 when experiments achieve flame extinction at an equivalence ratio of 0.55. The improved Linear Eddy Model is, however, shown to be closer to experimental data than a comparable reactive flow simulation that uses laminar closure of the species source terms.;The thermo-acoustic analysis is performed on a combustor rig designed at the Air Force Research Laboratory. The analysis is performed using a premixed single step global methane reaction for laminar reactive flow and shows that imposing a non-physical boundary condition at the rig exhaust will result in the suppression of acoustic content inside the domain and can alter the temperature contours in non-physical ways. It can be concluded from this work that it is important to include the proper exhaust configuration for reacting thermo-acoustic calculations so that non-physical boundary conditions do not compromise the solution.
机译：这项工作研究了钝体稳定火焰的三个主要方面：固定燃烧，稀薄喷出和热声不稳定性。对于平稳燃烧和稀薄喷吹的情况，使用了线性涡流模型方法的改进版本，而在热声不稳定的情况下，研究了边界条件对预测的影响。改进的版本将线性涡流模型与完整的解析尺度大涡流仿真方程式结合在一起，以实现连续性，动量，能量和物种迁移。在传统实现中，通常使用具有某些明显局限性的拉格朗日方法来求解物种方程。这项工作的新颖之处在于，可以在可分辨的尺度上求解欧拉物种浓度方程，并且严格使用线性涡模型来封闭物种产生项。在这项工作中，采用了改进的线性涡模型来预测火焰与沃尔沃装置内部的特性相比，当与使用预混合单步整体丙烷反应（当量比为0.65）的实验数据进行比较时，它会过度预测火焰温度和归一化速度。该模型还适用于预测稀薄燃尽，并显示出当实验以0.55的当量比实现火焰熄灭时，可以预测当量比为0.5的稳定火焰。但是，相比使用物种来源项的层流封闭的类似反应流模拟，改进的线性涡流模型显示出更接近实验数据。;热声分析是在空军研究部设计的燃烧器装置上进行的实验室。使用预混合的单步整体甲烷反应进行层流反应流进行分析，结果表明，在钻机排气口施加非物理边界条件会导致域内声波含量受到抑制，并且会改变非结构层中的温度轮廓。物理方式。从这项工作可以得出结论，重要的是包括适当的排气配置以对热声计算做出反应，以使非物理边界条件不会损害解决方案。

著录项

  • 作者

    Tovar, Jonathan Michael.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Aerospace engineering.;Mechanics.
  • 学位 M.S.
  • 年度 2015
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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