碳氢燃气超声速剪切流动燃烧数值模拟
Numerical simulation of hydrocarbon gas combustion and supersonic shear flow
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摘要: 数值模拟碳氢富燃燃气与空气二维超声速剪切流动的湍流燃烧.NND对流项差分格式高精度捕捉激波, B-L和普朗特混合长度模型模拟湍流粘性系数, Arrhenius反应动力学公式计算化学反应速率, 模拟非平衡态燃烧.计算的壁面压力值较好地符合了实验值.分析了剪切流驻焰稳定的波系结构, 从预测的流动参数和组分浓度分布判断燃烧状况的好坏, 从而为改善优化燃烧室结构提供工程参考.Abstract: A turbulent combustion of hydrocarbon fuel-rich gas with air two-dimensional supersonic shear flow was numerically simulated. NND difference scheme of convection item was used to capture shock wave with high precision, while turbulent viscid coefficient was calculated from B-L and Prandtl mixed length models. To simulate non-equilibrium combustion, Arrhenius reaction dynamic formula was used to confirm the chemical reaction rate. The simulated wall pressure results are in agreemant with the experimental data.The wave system suitable for flame stabilization was also analyzed.The combustion state was evaluated from the distribution of flow parameters and chemical components, providing a reference for improvement and optimization of combustion chamber.
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