共查询到20条相似文献,搜索用时 312 毫秒
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为探究叉翅散热器在某100 W LED舞台投光灯上的散热强化作用并进行优化设计,通过数值模拟与实验验证的方法,对影响叉翅散热器散热性能的主要几何因素及其机理进行了分析。以LED芯片最高温度和散热器质量为优化目标,对短翅长度与间距进行了单因素分析,然后通过NSGA-Ⅱ算法进行双目标优化,并进行模糊C均值聚类,得到了不同应用场景下散热器配置。结果表明:叉翅散热器可有效增强散热性能,其结构可增加翅片表面平均对流换热系数,短翅长度和间距对单位质量散热性能影响均存在最优值,短翅过长或间距过小均会使翅片表面对流换热系数下降。双目标优化后的叉翅散热器可在几乎不改变散热器质量时,降低LED芯片最高温度2.33℃。 相似文献
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针对LED汽车前照灯的散热问题,对比设计两款有/无散热槽的新型散热器结构形式,利用有限元分析软件ANSYS进行散热结构的热力学分析。针对初始设计的散热结构形式采用控制变量法进行参数优化,最后得出无槽结构的LED灯具最高温度为65.352℃,热应力为235.56 MPa;同等条件下有槽结构的LED灯具最高温度为62.712℃,最大应力为218.7 MPa。计算可知,具有散热槽LED灯具散热器优化后的温度相对无散热槽LED灯具散热器优化后的温度降低2.64℃,最大应力减小16.86 MPa。该仿真结果表明具有散热槽结构的散热器能够提高LED汽车前照灯的散热效果。 相似文献
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提出了一种自散热片式LED-COB光源结构。将LED芯片放置在6061铝合金基板侧面,该侧面加工有光学反光槽。整个基板既作为LED芯片的支架,又作为散热片。LED芯片与外界环境之间只有固晶胶一层热阻,大大提高了LED散热系统的散热效率。所设计的COB光源的功率为1~2 W、散热面积为30 cm2、质量为1.9 g。经过测试,在环境温度为25℃、功率1.92 W、发光面处于顶部的竖直放置的条件下,红外热像仪测得散热片上的最高温度为66.2℃,通过正向电压法测得LED芯片的结温为72.4℃。自散热片式COB-LED光源不仅能提高LED灯具的散热性能,同时还能降低LED灯具的系统成本。 相似文献
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大功率LED针翅式散热器散热性能数值模拟 总被引:1,自引:0,他引:1
发光二极管(LED)作为新一代光源,得到广泛应用.然而在工作过程中,大部分的电能会转变为热能,使LED的结温升高,可靠性降低.为了使LED芯片产生的热量能够及时有效地散发出去,通常采用翅片散热方法对其进行散热.采用数值模拟的方法对大功率LED针翅式散热器的散热性能进行了研究.为了验证模型的准确性,利用K型热电偶和安捷伦数据采集仪对散热器进行了实验测试.实验结果表明,该数值模型方程能够很好地模拟散热器的散热性能.此外,研究了大功率LED针翅式散热器的几何参数(翅片高度、半径、排数、列数)对LED散热性能(结温、对流换热系数和热阻)的影响,并且对翅片结构进行了优化分析. 相似文献
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照明用大功率LED射灯散热建模研究 总被引:1,自引:0,他引:1
散热问题是LED灯具成为新一代照明光源亟待解决的关键问题之一。提出一种LED灯具散热建模方法:选用LED射灯作为代表产品进行散热建模研究,采用三维造型软件建立LED灯具产品三维模型,然后导入有限元流体热分析软件(CFD)进行热仿真。研究散热仿真过程中的热阻设置、热量载荷计算和边界条件设定等关键问题,并求解LED射灯的工作温度分布情况;将仿真分析结果与实验室测试数据进行对比分析研究。研究结果表明,运用该方法可以对室内照明LED灯具进行较为准确的散热分析,仿真温度误差在4℃左右,仿真结果对灯具开发设计具有重要参考价值。 相似文献
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目前大功率LED灯具的散热问题已经成为制约LED行业深入发展的瓶颈,体积小、重量轻、结构相对简单、制造加工成本低的散热器是研究的主要方向.不同的散热器由于结构设计不同,工作时散热特点也不尽相同.本文在实测现有主流LED灯具散热器并总结分析散热效果,进而提出传热-散热一体的LED灯具散热器结构设计理念,并对LED灯具工作温度场的分析,验证了传热跟散热一体化设计的理念. 相似文献
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In this paper, thermal characteristics of the high-power LED spot lamp are reported. The emphasis is placed upon optimizing design of the heat sink of LED spot lamp using the optimization module and the orthogonal-experiment method. Results demonstrate that the weight of the heat sink is decreased to 46.1% of that for the initial structure, and the influence of each factor on junction temperature and weight of the heat sink is acquired by range analysis. Finally, the influence of ambient temperature and natural convection coefficient on the LED maximum temperature is analyzed. The results and the optimizing methodology are of great importance to the thermal design of LED lamps. 相似文献
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Thermal design for the high-power LED lamp 总被引:1,自引:1,他引:0
This paper summarizes different kinds of heat sinks on the market for high power LED lamps. Analysis is made on the thermal model of LED, PCB and heat sink separately with a simplified mode provided. Two examples of simulation are illustrated as a demonstration for the thermal simulation as guidance for LED lamp design. 相似文献
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This paper summarizes different kinds of heat sinks on the market for high power LED lamps.Analysis is made on the thermal model of LED,PCB and heat sink separately with a simplified mode provided.Two examples of simulation are illustrated as a demonstration for the thermal simulation as guidance for LED lamp design. 相似文献
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The goal of this study is to improve the thermal characteristics of high power LED (light-emitting diode) package using a flat heat pipe (FHP). The heat-release characteristics of high power LED package are analyzed and a novel flat heat pipe (FHP) cooling device for high power LED is developed. The thermal capabilities, including startup performance, temperature uniformity and thermal resistance of high power LED package with flat heat pipe heat sink have been investigated experimentally. The obtained results indicate that the junction temperature of LED is about 52 °C for the input power of 3 W, and correspondingly the total thermal resistance of LED system is 8.8 K/W. The impact of the different filling rates and inclination angles of the heat pipe to the heat transfer performance of the heat pipe should be evaluated before such a structure of heat pipe cooling system is used to cool high power LED system. 相似文献
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Thermal Analysis of High Power LED on Heat Sink 总被引:1,自引:0,他引:1
Thermal management of LED junction temperature is one of the fundamental technologies for LED lamp to ensure basic specifications in many aspects. Analysed is the high power LED's distribution on heat sink. Using mathematical statistical methods, a formula is conlcuded to calculate the size of heat sink under LED safe working temperature, which provides a method to researchers and LED lamp manufacturers. 相似文献
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为了满足照明需求,有时需要将LED灯具设计成照射角度可调的结构,采用有限元软件分析了三款搭配常见散热器的大功率LED筒灯在不同照射角度下的散热性能,结果发现搭配辐射状散热器的LED筒灯在低于30°照射角下散热效果较佳;搭配平板状散热器的LED筒灯绕不同方向转动照射时散热效果不同,在绕文中所示X轴方向转动时散热效果较好,适合多角度照射;搭配柱状散热器的LED筒灯在多角度照射情况下都具有较好的散热效果。研究结果为以后的筒灯设计提供了参考依据。 相似文献
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A novel porous micro heat sink system is presented for thermal management of high power LEDs, which has high heat transport capability. The operational principle and heat transfer characteristics of porous micro heat sink are analyzed. Numerical model for the micro heat sink is developed to describe liquid flow and heat transfer based on the local thermal equilibrium of porous media, and it is solved with SIMPLE algorithm. The numerical results show that the heated surface temperature of porous micro heat sink is low at high heat fluxes and is much less than the bearable temperature level of LED chips. The heat transfer coefficient of heat sink is very high, and increasing the liquid velocity can enhance the average heat transfer coefficient. The overall pressure loss of heat sink system increases with the increasing the inlet velocity, but the overall pressure drop is much less than the pumping pressure provided by micro pump. The micro heat sink has good performance for thermal management of high power LEDs, and it can improve the reliability and life of LEDs. 相似文献
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The performance of high power LEDs strongly depends on the junction temperature. Operating at high junction temperature causes degradation of light intensity and lifetime. Therefore, proper thermal management is critical for LED packaging. While the design of the heat sink is a major contributor to lowering the overall thermal resistance of the packaged luminaire, another area of concern arises from the need to address the large heat fluxes that exist beneath the die. In this study we conduct a thermal analysis of high power LED packages implementing chip-on-board (COB) architecture combined with power electronic substrate focusing on heat spreading effect. An analytical thermal resistance model is presented for the LED array and validated by comparing it with finite element analysis (FEA) results. By using the analytical expression of thermal resistance, it is possible to understand the impact of design parameters (e.g., material properties, LED spacing, substrate thickness, etc.) on the package thermal resistance, bypassing the need for detailed computational simulations using FEA. 相似文献