烟囱效应在大功率LED灯具散热器设计中的影响分析

Analysis of the Chimney Effect in Thermal Design of High-Power LED Lamps Radiator

烟囱效应具有强化对流、增强换热的能力。本研究设计了一款基于烟囱效应的大功率LED灯具散热器,采用有限元分析法分析烟囱效应在散热器散热过程中的作用效果。分别探讨了烟囱的高度、烟道孔径以及烟囱个数对散热器散热性能的影响。研究表明,本研究中烟囱烟道孔径的最佳尺寸为6mm。烟囱的高度可依据散热器的高度设计取40 mm^50 mm。在设计条件允许的前提下,烟囱个数越多散热器散热效果越好。

The chimney effect could enhance the convection and heat transfer. This study has designed a high-power LED lamps radiator based on chimney effect. The effect of the chimney designed in radiator was analyzed by finite element analysis method. The cooling performance of radiator was explored by changing the chimney height,flue aperture,and chimney number. The results show that the best chimney flue aperture size is 6mm. The chimney height can design to 40 mm ～ 50 mm based on the height of the radiator design. With the design conditions permitting,the more the chimney number the better the thermal performance of radiator heat.