A study on the local flame displacement velocity of premixed turbulent flames
A study on the local flame displacement velocity of premixed turbulent flames
复制标题
DOI：
10.1299/jsmeb.48.164
复制
发表时间：
2005-02
期刊：
影响因子：
--
通讯作者：
M. Nakahara;H. Kido;K. Nakashima
中科院分区：
文献类型：
--
作者：
M. Nakahara;H. Kido;K. Nakashima
本文对层流燃烧速度几乎相同但当量比不同的甲烷、丙烷和氢气混合物，在小火焰区，湍流传播火焰的局部火焰特性随湍流强度与层流燃烧速度之比u ′/SL_0的变化进行了实验研究。u ′/SL 0在1.4和2.3之间变化。采用二维激光层析成像技术获得了定容容器中火焰的形态和运动，并定量测量了湍流燃烧的关键参数--局部火焰位移速度SF。结果表明，SF的平均值受u ′/SL 0的影响，表明特征化学反应时间与特征流动时间之间存在一定的关系，特别是对于贫、富混合气。通过优先扩散和Markstein数的概念讨论了影响局部燃烧速度特性的SF。
The local flame properties of turbulent propagating flames with respect to the ratio of the turbulence intensity to the laminar burning velocity u’/SL0 in the flamelet regime have been investigated experimentally for methane, propane and hydrogen mixtures having nearly the same laminar burning velocity with different equivalence ratios. u’/SL0 is varied as 1.4 and 2.3. A 2D laser tomography technique is used to obtain the flame configuration and movement in a constant-volume vessel and then the local flame displacement velocity SF is quantitatively measured as a key parameter of turbulent combustion. As a result, the mean value of SF shows to be affected by u’/SL0, which indicates a relation between the characteristic chemical reaction time and the characteristic flow time, to some extent, especially for leaner and richer mixtures. SF is also discussed by the concept of preferential diffusion and Markstein number which can affect the local burning velocity characteristics.