反应机理对air/H ₂ 燃烧系统多场耦合仿真的适用性

For an air-hydrogen combustion system, a dynamic finite volume numerical model considering the multi-field coupling of flow, heat transfer and combustion was established, a general library of reaction mechanisms and physical property parameters was constructed. The thermodynamic calculation method and three sets of hydrogen-oxygen reaction mechanism methods were used for simulation calculation, and the latter can also describe the process of ignition and flameout, and reveal the impact of various elementary reactions and species changes on the combustion and flow transient process. The Williams mechanism fitted best with the results of the thermodynamic calculation, which was validated by experiments, followed by the Conaire mechanism, and the Evans mechanism was relatively poor. Compared with the Conaire mechanism, Williams reaction mechanism lowered the quenching temperature from 1200K to 1155.3K, reduced the calculation error from 4.7% to 2.74% under the low temperature condition of 1222.3K, and made the application of multi-coupling numerical system more extensive and the calculation result better. Under low temperature, H ₂ O ₂ and related reactions had a great influence on the description accuracy of the hydrogen-oxygen mechanism.