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为了研究倾斜冲击射流的流场结构和传热性能,采用SIMPLE算法和RNGk-ε湍流模型,对三种入射角度下的狭缝湍流冲击射流进行了数值模拟。结果表明,由于射流的卷吸以及上封闭板的作用,在流场两侧的流出区域分别形成了一个环形的回流区。当射流倾角减小时,左侧回流区的范围变小,而右侧的回流区增大。流场中的低温区以及冲击表面压力系数最大值和局部Nu最大值的位置也都随着倾角的减小而向流场的左侧偏移。当倾角减小时,冲击表面压力系数最大值降低,局部Nu最大值没有明显的变化,射流与冲击面之间的平均传热率降低。
In order to study the flow field structure and heat transfer performance of inclined impinging jets, the SIMPLE algorithm and RNGk-ε turbulence model were used to simulate the slit turbulence impinging jets at three angles of incidence. The results show that due to the entrainment of the jet and the effect of the upper closing plate, an annular recirculation zone is respectively formed in the outflow regions on both sides of the flow field. As the jet inclination decreases, the area of the left recirculation zone becomes smaller and the area of the right recirculation zone increases. The low temperature region in the flow field and the maximum of the pressure coefficient of the impact surface and the maximum value of the local Nu are also shifted to the left of the flow field as the inclination angle decreases. When the angle of inclination decreases, the maximum value of pressure coefficient of impact surface decreases, the maximum value of local Nu does not change obviously, and the average heat transfer rate between jet and impact surface decreases.