论文部分内容阅读
本文采用一维湍流模型(ODT)对氦气平面羽流和CH_4/H_2/N_2射流火焰进行数值模拟,和前人的实验结果进行定量地对比。结果表明,ODT模型能够准确地预测平面羽流基本特征,湍流涡团的分布同流场拉伸率之间具有密切的关系,涡团强度的分布能够直观地表明当地的湍流强度。ODT模型埘CH_4/H_2/N_2瞬态火焰的模拟定性反应了火焰特性及其与湍流作用的规律,对温度-混合分数的预测值和实测值进行比较,发现甲烷火焰燃烧在富燃料侧并未达到平衡状态,因而基元反应对火焰特性的预测具有重要作用。
In this paper, a one-dimensional turbulence model (ODT) is used to simulate the helium plume and CH_4 / H_2 / N_2 jet flame, which are compared quantitatively with previous experimental results. The results show that the ODT model can accurately predict the basic characteristics of planar plumes. The distribution of turbulent eddies is closely related to the elongation of the flow field. The distribution of turbulence intensity can directly indicate the local turbulence intensity. ODT model 埘 The simulation of the transient flame of CH_4 / H_2 / N_2 qualitatively reflects the flame characteristics and its interaction with turbulence. Compared with the predicted value of the temperature-mixing fraction and the measured value, it is found that the flame of methane is not enriched on the fuel-rich side Reach the equilibrium state, and therefore the elementary reaction plays an important role in the prediction of flame properties.