A Model of Turbulent Burning Velocity Taking the Preferential Diffusion Effect into Consideration
A Model of Turbulent Burning Velocity Taking the Preferential Diffusion Effect into Consideration
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DOI：
10.1299/jsmeb.41.666
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发表时间：
1998-08
期刊：
影响因子：
--
通讯作者：
H. Kido;M. Nakahara
中科院分区：
文献类型：
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作者：
H. Kido;M. Nakahara
在我们以前的工作中，我们发现湍流火焰中的优先扩散对其湍流燃烧特性起着重要的作用，并在考虑优先扩散效应的情况下，对预混湍流燃烧的局部燃烧速度进行了实验估算。本文提出了一种考虑优先扩散效应的预混湍流燃烧速度预测模型，用局部燃烧速度代替原来的层流燃烧速度。该模型可以解释如下。湍流通过增大火焰表面积和拉伸火焰来影响湍流燃烧速度。因此，湍流燃烧速度和熄灭极限取决于两者的平衡。将预测的燃烧速度与实际测量的湍流燃烧速度进行了比较，其中燃料、当量比和层流燃烧速度变化很大。结果证实了这一简单模型的定量准确性。
In our previous work, we found that the preferential diffusion in a turbulent flame played an important role in its turbulent combustion characteristics, and estimated the local burning velocity in premixed turbulent combustion experimentally, taking account of the preferential diffusion effect. In this study, a model, which takes the preferential diffusion effect into consideration, is proposed to predict the premixed turbulent burning velocity, using the local burning velocity as a reference instead of the original laminar burning velocity. The model can be explained as follows. The turbulence affects the turbulent burning velocity by increasing the flame surface area and stretching the flame. Consequently, the turbulent burning velocity and quenching limit are determined by the balance of both effects. The predicted velocities are compared with the measured turbulent burning velocities where the fuel, equivalence ratio and the laminar burning velocity were varied extensively. As a result, quantitative accuracy of this simple model is confirmed.