大功率LED路灯叉排式散热器的热学特性研究

本文结合有限体积数值模拟建立散热器热学模型，可准确计算散热器系统中温度场以及流体场分布，为有效评价散热器的散热效率提供重要参考依据。基于散热器热学模型．分析比较叉排式以及顺排式散热器的温度场以及流体场分布，发现又排式散热器中交错分布翅片可有效破坏散热器层流底层，增强了流体扰动，加大了换热效果，为优化叉排式散热器结构提供了可靠依据，进而通过分析优化散热器系统送风方向、粘结层材料、散热器材料对总体散热性能以及重量的交叉影响。

A Study on Thermal Characteristics for Staggered Heatsink System on High Power LED Street lamp

In this paper,thermal model of heatsink is established by finite volume thermal simulation method.The proposed model can predict temperature distribution and internal heat flow for heatsink system,which is important tool to evaluate the heat dissipation efficiency for heatsink system.Based on thermal model for heatsink system,the temperature distribution and heat flow on staggered and aligned heatsink systems can be compared and analysed.It is found that interrupted distribution of fins in the staggered heatsink offers mechanism of heat transfer enhancement by inducting oscillations in the flow in the form of shed vortices.These vortices enhance local heat transfer by continuously bring fresh fluid towards the heat transfer surfaces.Therefore staggered layout of heatsink can disturb the flow field,enhance the heat transfer.And this theory can provide important proof to design and optimize the structure of heatsink system.Further based on the thermal properties and weight for system,the flow direction,adhesive materials and bulk materials of heatsink have been analysed.