Analysis and Investigation of the Venting Structure in a Vehicle Lamp to Improve the Uniformity of the Heat Distribution

• Main Authors: Po-Jen Chen, 陳伯仁
• Other Authors: Wei-Ching Chuang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/fkuws5

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 102 === The head lamp affecting traffic safety, and the appearance is also a focus. When the illumination to produce high temperature. Made such as fog, parts melt, thermal aging or other situations. These situations are just about safety and appearance. So, to improve these conditions, all the head lmap add vent. It help the lamp can be thermal convection. By thermal convection so that the internal temperature distribution. But in order to dust. Plus the vent tube or vent assembly will directly affect the performance of convection. So for these two parts for analysis. In this study. We used the same sample to test these different equipment. One is vent tube, and the other one is vent assembly. Then, through CFD software analysis the flow field. Compare the inner and outer parts changes in temperature, and the air velocity of flow at the vent. Through the analysis could find, used vent tube, the temperature was lower than used the vent assembly. At the maximum temperature difference of about 5℃. And by the flow rate analysis could find, when used vent tube, the flow rate is about 0.5 m / s, when used vent assembly, the flow rate is about 0.3 m / s. So the vent tube is more fast than vent assembly. In order to verify the correctness of the software analysis. We lighting fixtures to verify. Analysis shows that the position of the highest temperature, where the position at the top of the lamp envelope. So we measured this position. The temperature of vent tube is 66.9℃. And the temperature of vent assembly is 71.2℃ . Compare the data of these two. The result is the performance by vent tube better than vent assembly.