【摘要】 利用烟囱效应改变散热器周围的空气运动状况,提出了一种设计结构,并对设计结构进行尺寸优化与效果分析。用SolidWorks建立LED设计及试验结构模型,用EFD(engineering fluid dynamics)热仿真,得到了在最优散热性能和最优综合性能下的结构尺寸及周围空气运动状况对比图。实验结果表明,在引入及优化前后,散热器的热阻降低了29.4%,综合性能可以提升43.9%,烟囱效应的引入,散热器有了明显卷吸周围空气的效应,散热器流出的空气束从向中间集中运动变为沿圆筒边缘方向向上运动,丰富了散热器周围的空气运动状态。更多还原

【Abstract】 Using the chimney effect to change the air movement around the radiator,a design structure is proposed,the size of the design structures are optimized and their effects are analyzed.The design and experimental structure models of LED are established with SolidWorks.The dynamic dimension of the structure and the surrounding air movement under the optimal heat dissipation performance and optimal comprehensive performance are obtained by engineering fluid dynamics(EFD)thermal simulation.The experimental results show that the thermal resistance of the radiator is reduced by 29.4%,and the comprehensive performance can be increased by 43.9% with the introduction and optimization.With the introduction of the chimney effect,the radiator has a significant effect of sucking around the air,and the movement of air out of the radiator changes from moving to the middle to moving upward along the direction of the cylindricity,which enriches the air movement around the radiator.更多还原