The three-dimensional steady incompressible numerical results of an isothermal flowfield resulting from the interaction of two swirl-stabilized air nozzles in a multiple lean direct injection combustor configuration are analyzed. The spacing between nozzles $S$ is varied from 1.1 to 2.72 nozzle diameters $d$ to analyze the degree of swirl interaction between them and their impact on the resulting flow structure. The numerical results were verified by performing a grid dependence and turbulence model implementation study and validated by comparing them with time-averaged particle image velocimetry and unsteady Reynolds-averaged Navier–Stokes formulation data. The numerical solution resolves aerodynamic flow features typically associated with swirl-based combustion such as a form of vortex breakdown at the center of both nozzles and highly complex flow structures both upstream and downstream of the dome wall. Nozzle spacing has an important effect on the shape of the recirculation region and the flow velocities. In particular, interaction in the tangential velocity between the two nozzles has large effects on the swirl number and the size of the recirculation zone. Most of the changes in flowfield seem to be affected after the inner shear-layer jets of both nozzles have merged into a single jet flow in the axial direction. Two intermediate spacings ($S=1.36$, $1.89d$) exhibit unusual behavior in that the inner shear layers (towards the adjacent nozzle) are drawn into the center of the combustor, and a wide and low-velocity flow is created between the swirlers. This could be due to the inner shear-layer jets between adjacent nozzles not merging properly and behaving in a classical manner of two turbulent opposed planar jets.

分析了在多个稀薄直接喷射燃烧器结构中两个涡流稳定的空气喷嘴的相互作用所产生的等温流场的三维稳态不可压缩数值结果。喷嘴间距$\mathrm{小号}$ 喷嘴直径从1.1到2.72不等 $d$分析它们之间的旋流相互作用程度及其对所产生的流动结构的影响。通过执行网格依赖性和湍流模型实施研究验证了数值结果，并将其与时间平均粒子图像测速仪和不稳定的雷诺平均Navier-Stokes公式数据进行比较进行了验证。数值解解决了通常与基于旋流的燃烧相关联的空气动力学流动特征，例如在两个喷嘴的中心处的涡旋破坏形式以及在圆顶壁的上游和下游的高度复杂的流动结构。喷嘴间距对再循环区域的形状和流速具有重要影响。特别是，两个喷嘴之间的切线速度之间的相互作用对旋流数和再循环区的大小有很大的影响。在两个喷嘴的内部剪切层射流已合并为轴向上的单个射流之后，流场中的大多数变化似乎都受到了影响。两个中间间距（$\mathrm{小号}=1.36$， $1.89d$表现出不同寻常的行为，因为内部剪切层（朝向相邻喷嘴）被吸入燃烧室的中心，并且在旋流器之间形成了宽而低速的流动。这可能是由于相邻喷嘴之间的内部剪切层射流未正确合并，并且表现为两个相对的湍流平面射流的经典方式。