本文選題：散熱 + 正交試驗(yàn)��； 參考：《華僑大學(xué)》2016年碩士論文

【摘要】：隨著LED產(chǎn)業(yè)蓬勃發(fā)展,各行各業(yè)的傳統(tǒng)光源燈具逐漸被LED燈具取代。但是,研究表明:當(dāng)LED工作時(shí),注入電功率的絕大部分都轉(zhuǎn)變成了熱能,若這些熱量無(wú)法被及時(shí)散去,則會(huì)出現(xiàn)性能下降,壽命降低等問(wèn)題。因此,本碩士論文主要研究三種LED燈具(LED塑包鋁球泡燈、高功率COB光源和LED汽車前大燈)的散熱性能并進(jìn)行優(yōu)化與實(shí)驗(yàn)驗(yàn)證。針對(duì)目前LED塑包鋁球泡燈散熱器優(yōu)化缺乏理論指導(dǎo)的問(wèn)題,提出基于正交試驗(yàn)的散熱器設(shè)計(jì)方法。首先通過(guò)對(duì)比三種LED球泡燈(全鋁、塑包鋁和全塑)的散熱,得出LED塑包鋁球泡燈具有一定優(yōu)勢(shì)。然后,提出利用正交試驗(yàn)對(duì)決定散熱性能的五個(gè)因素(塑料厚度、鋁厚度、散熱器高度、鋁底板厚度和底邊直徑)進(jìn)行優(yōu)化設(shè)計(jì),通過(guò)極差分析得到最優(yōu)參數(shù)組合。最后,通過(guò)制圖軟件SolidWorks創(chuàng)建結(jié)構(gòu)模型,導(dǎo)入基于有限元理論的FloEFD軟件進(jìn)行模擬仿真。結(jié)果表明:LED溫度由原來(lái)的96.05℃降為88.85℃,下降了7.2℃,散熱效果得到明顯改善。針對(duì)解決高功率COB光源熱流密度和熱量更加集中等問(wèn)題進(jìn)行了理論分析與實(shí)驗(yàn)驗(yàn)證。通過(guò)對(duì)比未安裝翅片散熱器和安裝散熱翅片結(jié)構(gòu)的熱仿真結(jié)果得出后者的散熱性能明顯好于前者。接著,采用正交試驗(yàn)對(duì)散熱翅片進(jìn)行優(yōu)化設(shè)計(jì),得到最優(yōu)散熱結(jié)構(gòu)的參數(shù)組合。仿真結(jié)果表明:經(jīng)過(guò)正交試驗(yàn)優(yōu)化后,溫度為74.73℃,大大提高了整體結(jié)構(gòu)的散熱性能。最后,采用紅外熱像儀(IRS S65)測(cè)試翅片優(yōu)化前后的溫度進(jìn)行對(duì)比發(fā)現(xiàn):實(shí)驗(yàn)和模擬仿真結(jié)果一致。此外,還研究了固晶膠和導(dǎo)熱膠導(dǎo)熱系數(shù)對(duì)該結(jié)構(gòu)溫度的影響,為以后繼續(xù)改善散熱性能提供了方向。針對(duì)LED運(yùn)用于汽車前大燈所面臨的散熱問(wèn)題,提出一款新型的LED汽車前大燈散熱結(jié)構(gòu),將無(wú)葉風(fēng)扇運(yùn)用于散熱器的設(shè)計(jì)中。在SolidWorks建立模型并導(dǎo)入FloEFD軟件進(jìn)行模擬仿真。與此同時(shí),提出了兩種改進(jìn)方案(通風(fēng)管填充矩形翅片和蜂窩結(jié)構(gòu))。針對(duì)散熱效果較好的方案二采用正交試驗(yàn)優(yōu)化分析了蜂窩類型、等效直徑、蜂窩壁厚、填充蜂窩長(zhǎng)度和通風(fēng)管長(zhǎng)度對(duì)該散熱系統(tǒng)散熱性能的影響,最終得出了系統(tǒng)模型結(jié)構(gòu)的最佳參數(shù)組合,仿真結(jié)果表明:經(jīng)過(guò)正交試驗(yàn)優(yōu)化后LED汽車前大燈的溫度為75.17℃。最后,針對(duì)該結(jié)構(gòu),討論溫度同風(fēng)速的關(guān)系并得到了相應(yīng)的表達(dá)式,可為后續(xù)無(wú)葉風(fēng)扇的選型等研究提供一定的參考。
[Abstract]:With the rapid development of LED industry, traditional light lamps in various industries are gradually replaced by LED lamps. However, it is shown that most of the injected electric power is transformed into heat energy when LED is working. If the heat can not be dissipated in time, the performance will be decreased and the life will be reduced. Therefore, the heat dissipation performance of three kinds of LED lamps, high power COB lamps and LED headlamps are studied and optimized and verified by experiments. Aiming at the lack of theoretical guidance to optimize the radiator of LED plastic-coated aluminum bulb lamp, the design method of radiator based on orthogonal test is proposed. Firstly, by comparing the heat dissipation of three kinds of LED bulb lamps (all aluminum, plastic coated aluminum and all plastic), it is concluded that LED plastic coated aluminum bulb lamps have some advantages. Then, the optimum design of five factors (plastic thickness, aluminum thickness, radiator height, aluminum bottom thickness and bottom diameter) which determines the heat dissipation performance by orthogonal test is proposed, and the optimal parameter combination is obtained by means of range analysis. Finally, the structure model is created by SolidWorks, and the FloEFD software based on finite element theory is introduced to simulate the model. The results showed that the temperature of the weight LED decreased from 96.05 鈩，

本文編號(hào)：1948222