【摘要】 对润滑油竖直纵向冲刷下的整体针翅管进行了阻力特性的实验研究。通过分析针翅管的翅高、节距和加工方向对针翅管阻力系数的影响,发现整体针翅管的流动阻力明显高于光管的流动阻力,不同结构参数的针翅管的阻力系数差别较大。在各影响因素中,翅高的影响占主导地位,阻力系数随着翅高的增加而成倍增加。由于三维翅片表面对流动的扰动和破坏,当润滑油的雷诺数达到200～300时,流动阻力曲线将发生转折。更多还原

【Abstract】 Friction characteristics of integral pin-fin tubes,through which lubricating-oil flowed verti-cally,were studied experimentally.Effects of the pitch,the height of fins and the machining direction on fric-tion coefficient were analyzed.The experimental results showed that the friction coefficient of the integral pin-fin tube was obviously lager than that of smooth tube.Compared with other influential factors,the effect of the height of fins was dominant.Because the three-dimensional pin fin could disturb and destroy the boundary layer,when the Reynolds Number reached 200~300,the friction coefficient curve began to bend,that was,a turning point was appeared in the friction coefficient curve.更多还原