Experiment and simulation of natural convection heat transfer of tower cylinder flange forgings for wind power
The temperature field of S355NL cylindrical casting billet(the height-to-diameter ratio was 1.05)in air-cooling process was studied by thermocouple temperature measurement experiments and simulation analyses.The proportion of con-vective heat transfer and radiation heat transfer was calculated,respectively.It was found that the convective heat transfer accounted for about 40％.The effect of workpiece inclination angle on heat transfer was investigated.The temperature dis-tribution of the workpiece gradually increased along the opposite direction of gravity.For the inclined cylindrical forging bil-let,the temperature gradually increased along the axis direction.It was due to the thickening of the thermal boundary layer,which resulted in a reduction in heat transfer efficiency.The distribution law of local Nusselt number was opposite to that of temperature distribution.The average temperature of the workpiece surface gradually increased with the increase of inclina-tion angle.
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