Studies of Jet Diffusion Flames Using Particle Image Velocimetry (PIV ) and Planar Laser-Induced Fluorescence (PLIF)

这是对湍流喷流扩散火焰基本性质的研究。粒子图像测速仪(PIV)和等离子体激光诱导荧光(PLIF)被应用于单独或同时使用，以提供有助于理解火焰现象或验证数值计算的测量结果。为了研究最新发现的边缘火焰低速稳定对喷出条件的适用性，进行了从升空状态到近喷出状态的火焰稳定测量。一种新的PIV方法被用于测量同向流动中射流中的夹带，该方法消除了反应发生时产生的不确定因素，并且可以提供作为射流雷诺数、弗劳德数和下游轴向距离的函数的夹带系数。测量CH是为了检查实际火焰表面的性质，这些变量包括射流速度、同向流动速度和浮力的影响。这项工作是与NASA斯坦福湍流研究中心协调进行的，该中心正试图将大涡模拟(LES)应用于同向流动火焰。

This is a study of fundamental properties of turbulent jet diffusion flames. New strategies are applied for using both particle image velocimetry (PIV) and plasma laser-induced fluorescence (PLIF), separately or simultaneously, to provide measurements useful for understanding flame phenomena or for validating numerical computations. Flame stabilization measurements are made from lift-off condition to near-blowout conditions to investigate the applicability of the recent discovery of low-speed stabilization of edge flames to blowout conditions. A novel PIV method is used for the measurements of entrainment into a jet in coflow that eliminates the uncertainties that occur when reaction takes place and can provide the entrainment coefficient as a function of the jet Reynolds number, Froude number, and axial distance downstream. Measurements of CH are made to examine the nature of the actual flame surface over a number of variables including jet velocity, coflow speeds, and the influence of buoyancy. This effort is coordinated with the NASA Stanford Center for Turbulence Research which is attempting to apply large-eddy simulation (LES) to coflow flames.