层流预混滞止火焰结构及传播速度实验研究

火焰传播速度反映了火焰和燃料燃烧的基本特性，但火焰传播比较复杂，受流动，传热以及化学反应等众多因素的影响，在实际的系统中，无法得到理想化的平面燃烧波，而利用平面滞止火焰可外推得到零位伸率下的火焰传播速度，即理想层流火焰传播速度。在建立稳定的层流预混滞止火焰的基础上，用激光多普勒仪测定了滞止流动的速度分布，得到了火焰结构的一些特征，并根据同一空燃比下不同位伸率与当地火焰传播速度的关系，获得了理想层流

Experimental Study of the Structure of a Premixed Laminar Stagnant Flame and Propagation Speed

The flame propagation speed is an important feature of the flame and the combustible mixture.The phenomenon of flame propagation is a very complicated process.The flame speed is influenced by many factors,such as fluid dynamics,heat transfer and chemical reaction dynamics.In fact,it is impossible to set up an ideal plane in a practical system,so it is not easy to determine the speed of a laminar premixed flame in an experimental setup.One of the methods to measure the propagation speed is to utilize the stagnant flame.An experimental setup of a stagnant flame was used in this paper to measure the minimum speed at the location before the flame sheet by LDA.The flame structure at different stretch rates was discussed and the ideal flame propagation speed was determined by extrapolating the speeds before the flame sheet at different stretch rates to zero stretch rate.