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以甲烷/空气为研究对象,利用YA-16多闪光高速照相机对碰撞射流火焰进行了实验研究。基于带化学反应的二维轴对称Navier-Stokes方程,采用带有Superbee限制函数的波传播算法,对该现象进行了数值模拟。结果表明,对撞前,由于Helmhotz不稳定的作用,射流火焰演变成带有涡环的蘑菇云。碰撞后,在其诱导的流场和涡的作用下,形成的火焰杆的直径基本没有变化,火焰盘则沿着碰撞平面往四周发展,而其厚度逐渐变薄。计算结果和实验照片进行了比较,两者符合得较好。
Taking methane / air as the research object, the collision jet flame was experimentally studied by YA-16 multi-flash high-speed camera. Based on the two-dimensional axisymmetric Navier-Stokes equations with chemical reaction, the wave propagation algorithm with Superbee limit function was used to simulate this phenomenon. The results show that before the collision, due to the instability of Helmhotz, the jet flame evolved into mushroom cloud with vortex ring. After the collision, the diameter of the flame rod formed basically did not change under the flow field and vortex induced by it, and the flame disk developed along the collision plane to the periphery, and its thickness became thinner. The calculated results are compared with the experimental photographs, the two are in good agreement.