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为深入研究折流式环形燃烧室燃烧过程,在任意曲线坐标系下发展了一套可对湍流燃烧进行数值分析的数值模拟软件。通过求解偏微分方程生成数值研究所需结构化网格,使用混合差分格式对气相控制方程进行离散并基于SIMPLE算法进行求解,分别采用RNG k-ε与Wilcox k-ω模型分析不同湍流模型对计算结果的影响,近壁区域流动采用三层壁面函数法加以处理。数值模拟结果表明,引入燃烧室的新鲜空气在扩压器出口流动方向发生折返,在扩压器下侧形成了较大的回流区域,导致较大的总压损失。不同紊流模型预测结果与试验数据符合较好,其中Wilcox k-ω最为准确,更适用于折流燃烧室燃烧过程的数值分析。
In order to further study the combustion process of baffled annular combustor, a numerical simulation software for numerical analysis of turbulent combustion was developed under arbitrary curvilinear coordinate system. By solving the partial differential equations, a numerical study of the required structured grid was made. The mixed-phase difference equations were used to discretize the gas-phase control equations and solved by SIMPLE. RNG k-ε and Wilcox k-ω models were used to analyze different turbulence models. As a result, the flow in the near wall is treated by the three-layer wall function method. Numerical simulation results show that the fresh air introduced into the combustion chamber reverts to the outlet of the diffuser and forms a large recirculation zone on the lower side of the diffuser, resulting in a large total pressure loss. The prediction results of different turbulence models are in good agreement with the experimental data. Among them, Wilcox k-ω is the most accurate and suitable for the numerical analysis of the combustion process in baffled combustor.