...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Combustion Science and Technology >SCALAR DISSIPATION RATE TRANSPORT AND ITS MODELING FOR LARGE EDDY SIMULATIONS OF TURBULENT PREMIXED COMBUSTION
【24h】

SCALAR DISSIPATION RATE TRANSPORT AND ITS MODELING FOR LARGE EDDY SIMULATIONS OF TURBULENT PREMIXED COMBUSTION

机译：湍流过混燃烧大涡模拟的标量耗散率传输及其建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Statistical behavior of Favre-filtered scalar dissipation rate (SDR) transport has been analyzed using direct numerical simulations (DNS) data of freely propagating statistically planar turbulent premixed flames. The DNS data has been explicitly filtered using a Gaussian filter to obtain the unclosed terms of the Favre-filtered SDR transport equation, arising from turbulent transport (T-1), density variation due to heat release (T-2), strain rate contribution due to the alignment of scalar and velocity gradients (T-3), correlation between the gradients of reaction rate and reaction progress variable (T-4), molecular dissipation of SDR (-D-2), and diffusivity gradients f (D). It has been found that T-2, T-3, T-4, (-D-2), and f (D) are the leading order contributors to the SDR transport and the magnitude of T1 remains smaller than the magnitudes of T-2, T-3, T-4, (-D-2), and f (D) irrespective of the filter width. Models are proposed for these terms in the context of large eddy simulations (LES) and their performances have been assessed with respect to their corresponding values obtained from explicitly filtered DNS data. These newly proposed models are found to satisfactorily predict both the qualitative and quantitative behaviors of these unclosed terms for a range of different values of filter widths Delta, heat release parameter tau, and turbulent Reynolds number Ret.
机译：使用自由传播的统计平面湍流预混火焰的直接数值模拟（DNS）数据分析了Favre滤波的标量耗散率（SDR）传输的统计行为。已使用高斯滤波器对DNS数据进行了显式滤波，以获取由Favre滤波的SDR传输方程的未封闭项，这些方程是由湍流传输（T-1），由于放热引起的密度变化（T-2），应变率贡献引起的由于标量和速度梯度（T-3）对齐，反应速率和反应进度变量的梯度（T-4）之间的相关性，SDR的分子耗散（-D-2）和扩散率梯度f（D） 。已经发现，T-2，T-3，T-4，（-D-2）和f（D）是SDR传输的主要贡献者，并且T1的大小仍然小于T的大小-2，T-3，T-4，（-D-2）和f（D），与滤镜宽度无关。针对这些术语，在大型涡流仿真（LES）的背景下提出了模型，并针对从明确过滤的DNS数据获得的相应值对它们的性能进行了评估。发现这些新提出的模型可以令人满意地预测过滤器宽度Delta，放热参数tau和湍流雷诺数Ret的不同值范围内这些未封闭项的定性和定量行为。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号