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采用数值模拟的方法对矩形槽道内湍流的流动与传热特性进行了研究,并对充分发展湍流边界层内的法向脉动速度和展向脉动速度分别进行了控制,对添加控制后的槽道流动与传热特性进行了研究。将矩形槽道内湍流模拟结果与Kim等人的直接数值模拟结果进行了比较,模拟结果与直接数值模拟结果吻合较好,换热面Nu数与采用Gnielinsk公式计算所得Nu数进行了比较。通过对边界层内脉动速度控制可以达到减阻的目的,控制方法采用将边界层内的条带型区域内正法向脉动速度控制为0和原脉动速度的0.1、0.2、0.3倍,展向脉动速度控制为0,但随着流动减阻效果的提高,槽道换热面的换热效果也均有所降低。
The flow and heat transfer characteristics of the turbulent flow in the rectangular channel were studied by numerical simulation. The normalized pulsation velocity and the spreading velocity in the turbulent boundary layer were controlled respectively. After adding the controlled channel Flow and heat transfer characteristics were studied. The results of turbulent simulation in rectangular channel and direct numerical simulation of Kim et al. Are compared. The simulation results are in good agreement with the direct numerical simulation. The Nu numbers of the heat transfer surfaces are compared with the Nu numbers calculated by the Gnielinsk formula. The purpose of drag reduction can be achieved by controlling the pulsation velocity in the boundary layer. The control method adopts the method that the normal normal pulsation velocity in the boundary layer is controlled to 0 and the original pulsation velocity is 0.1, 0.2 and 0.3 times, The speed control is 0, but with the improvement of the flow drag reduction effect, the heat exchange effect of the channel heat transfer surface is also reduced.