Validation of a Turbulent Flame Speed Model across Combustion Regimes
Validation of a Turbulent Flame Speed Model across Combustion Regimes
复制标题
跨燃烧状态的湍流火焰速度模型的验证
DOI：
10.1080/00102200903341587
复制
发表时间：
2010
影响因子：
1.9
通讯作者：
N. Swaminathan
中科院分区：
文献类型：
--
作者：
H. Kolla;J. Rogerson;N. Swaminathan
本文对最近提出的火焰速度表达式进行了详细的研究和验证。这个表达式没有可调参数，其常数与小尺度下标量混合的物理学密切相关。在弱湍流极限下，火焰速度表达式恢复了湍流与层流火焰速度比对标准化湍流均方根速度的线性依赖关系，与Damköhler的经典结果一致。然而，在强湍流的极限下，Damköhler的结果给出了平方根依赖性，而新的表达式给出了线性项和平方根项的组合。新表达式的预测进行了比较，从各种火焰配置和条件下，具有相同的模型常数值的S T的实验数据范围广泛。定量比较发现是非常好的实验数据超出了现有模型的通常限制的范围。高压湍流火焰，高达3 MPa的ST预测，也比较可以接受的实验测量。火焰刷的平均曲率为正时，火焰速度增加，这种依赖关系似乎是线性的。
A flame speed expression proposed recently is studied in detail and extensively validated in this study. This expression has no adjustable parameters, and its constants are closely tied to the physics of scalar mixing at small scales. In the weak turbulence limit, the flame speed expression recovers a linear dependence of the turbulent to laminar flame speed ratio, , on the normalized turbulence rms velocity, , in accordance with Damköhler's classical result. However, in the limit of intense turbulence, Damköhler's result gives a square-root dependence, while the new expression gives a combination of linear and square-root terms. Predictions of the new expression are compared to a wide range of experimental data of S T from various flame configurations and conditions, with the same values of the model constants. The quantitative comparisons are found to be very good with experimental data beyond the usually restricted range of of existing models. Predictions of S T for high-pressure turbulent flames, up to 3 MPa, also compare acceptably well with experimental measurements. The flame speed is found to increase when the mean curvature of the flame brush is positive, and this dependence seems to be linear.