针对LED散热器热分析常用的热传导分析模型与流固耦合分析模型存在适用面窄与计算量大的不足, 研究了LED散热器热分析的建模方法。提出了一种可以用热传导分析模型等效简化流固耦合分析模型的方法, 该方法能快速得到散热器的温度状态并能从等效换热系数h获得LED散热器所需风扇的技术参数即风扇流量, 有助于风扇规格的选择。以一款LED车灯风冷散热器的热分析为例, 表明提出的等效简化建模方法不仅可以提高分析计算效率, 而且具有良好的实用价值。

According to the shortcomings of commonly used heat transfer analysis model and fluid-solid coupling analysis model, the narrow applicability and large computation in the LED radiator thermal analysis, the modeling methods of LED radiator thermal analysis was studied. Proposed is an equivalent thermal conduction analysis model which can be used to simplify the fluid-solid coupling analysis method, thus there is no need to calculate complex fluid-structure coupling model and the temperature state of the radiator can be gotten. And from the calculation, it is easy to obtain the equivalent heat transfer coefficient h, and the technical parameters of LED radiator, e.g. flow of fan, which is needed to choose the fan size. From the analysis of air-cooled radiator for LED light as an example, it shows that the proposed equivalent modeling method which simplifies the analysis can not only improve computational efficiency, but also has application value in practice.