Simulation of front propagation at large non-dimensional flow disturbance intensities
Simulation of front propagation at large non-dimensional flow disturbance intensities
复制标题
大无量纲流动扰动强度下的前沿传播模拟
DOI：
10.1080/00102209408935452
复制
发表时间：
1994
影响因子：
1.9
通讯作者：
P. Ronney
中科院分区：
文献类型：
--
作者：
J. Zhu;P. Ronney
本文对非均匀二维流动中的传播锋面进行了数值模拟，以模拟这种流动对预混火焰前锋的影响。特别研究了流动扰动强度(uύ)对锋面平均传播速率(ST)的影响，采用水平集(G方程)描述锋面自传播的二阶数值方法和描述锋面对流的多维迎风技术相结合。用这种方法计算了无量纲扰动强度(uύisl)在uύ/sL>；i取值时对无量纲传播速率(Stisl)的影响。该公式考虑了层流传播速度(Sj)对火焰拉伸(包括前曲率和速度应变效应)的依赖关系。重点研究了“泰勒涡”区域内模拟的泰勒-库埃特流动中的锋面传播，结果表明，在“泰勒涡”区域内，前锋的传播规律与数值模拟的结果相比，具有较高的精度。
Abstract ABSTRACT–Numerical modeling of propagating fronts in non-uniform two-dimensional flow fields is performed in orderto simulatetheeffect of such flowson premixed flamefronts. In particular, the influence of the flow disturbance intensity (uύ) on the mean front propagation rate (ST) is examined.A second-order numerical technique is employed that combines the level set (G-equation) formulation to describe the self-propagation of the front and a multidimensional upwind technique to describe the convection of the front by the flow field. In this way the effect of the non-dimensional disturbance intensity (uύISL) on the non-dimensional propagation rate (STISL) at values of uύ/SL>> I is computed. The dependence of the laminar propagation speed (SJ on the flame stretch (including both the front curvature and the velocity strain effects) is incorporated in this formulation. We focus on front propagation in simulated Taylor-Couette flows in the “Taylor vortex#rdquo; regime and the results are found to compa...