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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis of ignition and flame stabilization in an n-heptane spray flame
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Numerical analysis of ignition and flame stabilization in an n-heptane spray flame

机译：正庚烷喷雾火焰着火和火焰稳定的数值分析

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摘要

Unsteady Reynolds-averaged Navier-Stokes (URANS) and large-eddy simulations (LES) of an n-heptane spray flame have been performed with efficient chemistry calculation via dynamic adaptive chemistry and uniformly random distribution parallelization. Predictions for such key parameters as ignition delay time and flame lift-off length are validated against the experimental data from the engine combustion network. The transient, convection, diffusion and chemical reaction terms in species transport equations are analyzed to gain insight into flame stabilization mechanisms, showing the dominant effects from the auto-ignition process. The influence of the turbulence-chemistry interaction on the ignition and flame stabilization is studied for two cases with different initial ambient temperatures by reconstructing probability density function of mixture fraction. For the case with an initial ambient temperature of 1000 K, the analysis shows the fluctuation in mixture fraction is significant, but it has negligible influence on the ignition process. For the case with an initial ambient temperature of 850 K. the turbulence-chemistry interaction plays a significant role on ignition and consequently the stabilization process. In addition, large eddy simulations with a third-order Monotone Upstream-centered Schemes for Conservation Laws are performed for a series of cases with different oxygen concentrations. The results show that LES predict the instantaneous flame dynamics and flame lift-off lengths more accurately than URANS.
机译：通过动态自适应化学和均匀随机分布并行化，通过高效化学计算，进行了正庚烷喷雾火焰的非稳态雷诺平均Navier-Stokes（URANS）和大涡模拟（LES）。根据发动机燃烧网络的实验数据验证了诸如点火延迟时间和火焰剥离长度等关键参数的预测。分析了物种迁移方程中的瞬态，对流，扩散和化学反应项，以深入了解火焰稳定机理，显示了自燃过程的主要作用。通过重构混合分数的概率密度函数，研究了两种初始环境温度不同的情况下湍流化学相互作用对点火和火焰稳定的影响。对于初始环境温度为1000 K的情况，分析表明混合物分数的波动很大，但对点火过程的影响可忽略不计。对于初始环境温度为850 K的情况，湍流-化学相互作用在着火和稳定过程中起着重要作用。此外，对于一系列具有不同氧气浓度的情况，还采用了三阶单调上游中心守恒律的大型涡模拟。结果表明，LES比URANS更准确地预测瞬时火焰动力学和火焰升起长度。

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  • 来源
  • 作者

    Lei Zhou; Zhen Lu; Zhuyin Ren; Tianfeng Lu; K. H. Luo;

  • 作者单位

    Center for Combustion Energy, Tsinghua University, Beijing 100084, China;

    Center for Combustion Energy, Tsinghua University, Beijing 100084, China;

    Center for Combustion Energy, Tsinghua University, Beijing 100084, China,School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;

    Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269, USA;

    Center for Combustion Energy, Tsinghua University, Beijing 100084, China,Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spray flames; Auto-ignition; Lift-off length; Turbulence-chemistry interaction; Dynamic adaptive chemistry;

    机译：喷射火焰;自动点火;提离长度;湍流-化学相互作用;动态自适应化学;

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