We investigate the use of an experimental 2-D temperature profile to constrain detailed numerical solutions of a sooting coflow laminar diffusion flame. Experimentally, four optical diagnostic techniques are used to measure the two-dimensional temperature field in an ethylene-air coflow flame. This experimental temperature field is then used to impose the temperature in the solution process, thus obviating the need to solve the energy equation and, in particular, to incorporate costly models of radiative losses in the flame. Results are presented for a 40% ethylene-air flame on the Yale Coflow Burner. In the unconstrained solution of the complete set of governing equations, the location of maximum temperature is found along the flame wings, whereas the experimental temperature field has its maximum along the centerline. Similarly, the location of peak soot volume fraction migrates from along the flame wings in the unconstrained calculation, where soot surface growth processes dominate, to the centerline in the constrained case, where soot inception is the dominant condensed-phase formation mechanism. The distribution of soot in the constrained solution is much more consistent with experimental observations, and this fact illustrates how the validation of a soot sub-model may be complicated by the necessity of modeling distributed heat losses in the flame.

我们研究使用实验的二维温度曲线来约束烟co共流层流扩散火焰的详细数值解。实验上，四种光学诊断技术用于测量乙烯-空气共流火焰中的二维温度场。然后，该实验温度场用于在固溶过程中施加温度，从而避免了求解能量方程的需要，特别是无需在火焰中合并昂贵的辐射损耗模型。给出了耶鲁Coflow燃烧器上40％的乙烯-空气火焰的结果。在完整的控制方程组的无约束解中，沿着火焰翼找到最高温度的位置，而实验温度场沿着中心线具有最大值。同样，在无约束的计算中，烟灰峰值体积分数的位置从沿火焰翼移动，在无约束的计算中，烟灰的表面生长过程占主导地位；在受约束的情况下，烟灰的开始是占主导地位的凝结相形成机制。约束溶液中烟尘的分布与实验观察结果更加一致，这一事实说明，必须对火焰中分布的热量损失进行建模，从而使烟尘子模型的验证变得复杂。