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为研究射流引起的纵向涡对流动和换热性能的影响,采用数值方法模拟了三维矩形通道内有射流从底面进入时的定常、不可压层流对流换热,得到了纵向涡影响下的速度场和温度场以及沿流动方向局部Nusselt数的分布。以场协同原理为指导,分析了射流纵向涡强化换热的原因,并进一步研究了射流角对纵向涡的换热强化效果的影响。结果表明:纵向涡改善了通道内速度场和温度场的协同关系,强化了对流换热;射流垂直底面入射时,纵向涡的换热强化效果较好。
In order to study the influence of jet on the flow and heat transfer performance of a longitudinal vortex, a numerical method is used to simulate the steady and incompressible laminar convection heat transfer in a three-dimensional rectangular channel with the jet entering from the bottom. The velocity Field and temperature fields and distribution of local Nusselt numbers along the flow direction. Guided by the principle of field synergy, the reasons for the enhancement of the longitudinal vortex heat transfer are analyzed, and the influence of the jet angle on the heat transfer enhancement of the longitudinal vortex is further studied. The results show that the longitudinal vortex improves the synergistic relationship between the velocity field and the temperature field in the channel and enhances the convective heat transfer. When the vertical bottom surface of the jet is incident, the longitudinal vortex heat transfer enhancement effect is better.