Abstract Experimental and numerical studies have been conducted to investigate the flow field and heat transfer characteristics of a pair of dual interacting swirling flames impinging on a flat surface. Commercial computational fluid dynamics (CFD) code (FLUENT®) has been used to simulate the interacting isothermal swirling impinging jets. Inverse heat conduction procedure (IHCP) has been used to calculate the impingement heat fluxes from the surface temperatures captured by Infra-red camera. Effect of separation distance (H/Dh = 2.5, 4, 6 and 8) and inter-jet spacings (S/Dh = 4, 6, 8 and 10) have been studied at various Reynolds numbers (Re(o) = 7000, 9000, 11000, 13,000 and Re(i) = 700, 1000, 1300) under stoichiometric conditions. Strong interactions between adjacent dual swirling flames result in high heat transfer due to increased mixing and turbulence in the interaction region. The inner non-swirling flames are seen to deflect towards interacting side due to asymmetric interactions. Numerical simulation predicted this deflection to be primarily due to large recirculation bubble developed from asymmetric interactions. Tilted cross-flow, emerging from interaction region has been observed due to momentum exchange taking place between cross-flow and swirling flames (jets). Area weighted average of local heat flux and relative deviation from averaged value has been calculated at various H/Dh and S/Dh. High average heat fluxes are obtained at smallest H/Dh and S/Dh. It has been concluded that for a system of burners considered for the present study, H/Dh = 2.5 and S/Dh = 8 is the optimum configuration on the basis of minimum relative deviation.

中文翻译：

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一对相互作用的双旋流火焰射流撞击平面的传热和流体流动特性

摘要 通过实验和数值研究，研究了一对双相互作用旋流火焰撞击平面的流场和传热特性。商业计算流体动力学 (CFD) 代码 (FLUENT®) 已用于模拟相互作用的等温涡旋撞击射流。逆热传导程序 (IHCP) 已被用于从红外相机捕获的表面温度计算撞击热通量。在各种雷诺数 (Re(o) = 7000, 9000、11000、13,000 和 Re(i) = 700、1000、1300) 在化学计量条件下。由于相互作用区域中的混合和湍流增加，相邻双旋流火焰之间的强相互作用导致高热传递。由于不对称的相互作用，可以看到内部非旋转火焰向相互作用的一侧偏转。数值模拟预测这种偏转主要是由于不对称相互作用产生的大的再循环气泡。由于横流和旋流火焰（射流）之间发生动量交换，已经观察到从相互作用区域出现的倾斜横流。计算了不同 H/Dh 和 S/Dh 下局部热通量的面积加权平均值和与平均值的相对偏差。以最小的 H/Dh 和 S/Dh 获得高平均热通量。得出的结论是，对于本研究考虑的燃烧器系统，H/Dh = 2。