Effect of content of hydrogen (H₂) in fuel stream, mole fraction of H₂ $\left(X_{H_2}\right)$ in fuel composition, and velocity of fuel and co-flow air $\left(V_{avg}\right)$ on the flame characteristics of a co-flow H₂/N₂ laminar diffusion flame is investigated in this paper. Co-flow burner of Toro et al. [1] is used as a model geometry in which the governing conservation transport equations for mass, momentum, energy, and species are numerically solved in a segregated manner with finite rate chemistry. GRI3 reaction mechanisms are selected along with the weight sum of grey gas radiation (WSGG) and Warnatz thermo-diffusion models. Reliability of the newly generated CFD (computational fluid dynamics) model is initially examined and validated with the experimental results of Toro et al. [1]. Then, the method of investigation is focused on a total of 12 flames with $X_{H_2}$ varying between 0.25 and 1, and $V_{avg}$ between 0.25 and 1 ms⁻¹. Increase of flame size, flame temperature, chemistry heat release, and NOx emission formation resulted are affected by the escalation of either $X_{H_2}$ or $V_{avg}$. Significant effect on the flame temperature and NOx emission are obtained from a higher $X_{H_2}$ in fuel whereas the flame size and heat release are the result of increasing $V_{avg}$. Along with this finding, the role of N₂ and its higher content reducing the flame temperature and NOx emission are presented.

燃料流中氢（H ₂）含量，H _2的摩尔分数的影响 $（X_{H_{\mathrm{2个}}}）$ 燃料成分，燃料和并流空气的速度 $（{\mathrm{伏特}}_{\mathrm{一个}vG}）$本文研究了共流H ₂ / N ₂层流扩散火焰的火焰特性。Toro等人的同流燃烧器。文献[1]被用作模型几何体，其中质量，动量，能量和物质的支配守恒运输方程式是用有限速率化学方法以分离的方式进行数值求解的。选择GRI3反应机理以及灰气体辐射（WSGG）和Warnatz热扩散模型的权重之和。最初检查了新生成的CFD（计算流体动力学）模型的可靠性，并通过Toro等人的实验结果进行了验证。[1]。然后，研究方法集中在总共12个火焰$X_{H_{\mathrm{2个}}}$ 在0.25和1之间变化，以及 ${\mathrm{伏特}}_{\mathrm{一个}vG}$在0.25和1ms ^-1之间。两者的升级会影响火焰大小，火焰温度，化学放热和形成的NOx排放的增加$X_{H_{\mathrm{2个}}}$ 或者 ${\mathrm{伏特}}_{\mathrm{一个}vG}$。较高的温度对火焰温度和NOx排放有显着影响$X_{H_{\mathrm{2个}}}$ 在燃料中，而火焰尺寸和放热是增加的结果 ${\mathrm{伏特}}_{\mathrm{一个}vG}$。伴随着这一发现，提出了N ₂的作用及其含量的降低，降低了火焰温度和NOx的排放。