Abstract Verify the numerical model and physical mesh on the basis of the experiment, and then analyze the flow dynamics of the combustion chamber of the dual-stage counter-rotating swirler based on the verified numerical method. It is found that the flow dynamics of the combustion chamber of the dual-stage counter-rotating swirler is different from that of the single-stage swirler, which is affected by the change of the confinement ratio. With the increasing of confinement ratio, the flow field characteristics of combustion chamber with the dual-stage counter-rotating swirler presented in turn the axial growth flow pattern of reflux bubble (Rc ≤ 3.8), contraction flow pattern in the middle of reflux bubble (5.3 ≤ Rc ≤ 10.6) and double reflux bubble flow pattern (Rc ≥ 19.5). In addition, this paper defines the influence factor based on the change of confinement ratio, and quantitatively studies the degree of influence of the confinement ratio variation on the length of the return area of the combustion chamber. The work of this paper deepens the understanding of the physical mechanism that influences the flow and combustion by the confinement ratio, and also provides the improvement scheme for the optimization and design of the combustion chamber with dual-stage counter-rotating swirler.

中文翻译：

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不同约束空间双级反旋流燃烧室的流动动力学

摘要 在实验的基础上对数值模型和物理网格进行验证，然后基于验证的数值方法对双级对转旋流器燃烧室的流动动力学进行分析。发现双级对转旋流器燃烧室的流动动力学与单级旋流器不同，受约束比变化的影响。随着约束比的增大，双级对旋旋流器燃烧室的流场特性依次呈现回流泡轴向生长流型（Rc≤3.8），回流泡中部收缩流型（Rc≤3.8）。 5.3 ≤ Rc ≤ 10.6）和双回流气泡流型（Rc ≥ 19.5）。此外，本文基于约束比的变化定义了影响因素，定量研究了约束比变化对燃烧室回流区长度的影响程度。本文的工作加深了对约束比影响流动和燃烧的物理机制的理解，也为双级对转旋流器燃烧室的优化设计提供了改进方案。