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研究生:林俊廷
研究生(外文):Jung-ting Lin
論文名稱:汽車頭燈流場之分析
論文名稱(外文):Flow Analysis for Automotive Headlamps
指導教授:周榮華周榮華引用關係
指導教授(外文):Jung-Hua Chou
學位類別:碩士
校院名稱:國立成功大學
系所名稱:工程科學系碩博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:74
中文關鍵詞:霧氣頭燈CFD通氣孔
外文關鍵詞:ventheadlampCFDmoisture
相關次數:
  • 被引用被引用:2
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近年來,汽車整體造型朝流線型發展,汽車頭燈設計隨之多變化,導致頭燈內部之配置也趨複雜化,頭燈內部容易有氣流不易流通至狹窄角落之情況,因此容易於角落區域產生霧氣之情形。
本研究之目的主要將實驗所量得之燈泡表面溫度當以模擬時所需之熱源條件,再藉由CFD軟體對頭燈內部進行流場之數值分析,探討在僅改變通氣孔大小、數目、位置之條件下,對產生霧氣區域流場之影響,來尋求最佳化之排氣孔設計,進而克服頭燈霧氣之情況。
由CFD模擬結果顯示,在考慮引擎熱以及僅開啟通氣孔Vent3之條件下,加大通氣孔之管徑,於Corner處速度分佈維持不變,而Side處之最低流速下降50%;此外,在考慮頭燈內部濕度情況下,相較於原設計之通氣孔情況,可將Side處之最大相對濕度降低約34.9%,Corner處也可降低1%。另外,在考慮不同通氣孔位置、數量以及引擎熱影響,探討於最低速度時,同時開啟Vent3及Vent6,其Corner及Side最低速度均較僅開啟Vent3佳,分別約可上升19.4%及50%;但當考慮其濕度情況時,於Corner及Side兩區域內之最高相對濕度反而上升,故可將此歸類為一非理想情況。因此,於通氣孔之情況選擇上,可考慮將原設計之通氣孔管徑增加25%,以降低霧氣產生。
In recent years, streamlining becomes essential in vehicle designs, and the design of headlamps is no exception which leads to complex internal structures. The common moisture problems can occur while the flow inside the headlamps moves to narrow corners and spaces. This study uses measured temperatures on the headlamp surfaces as the heat sources while simulating, by a CFD software to analyze the flow fields inside lamps. The effects of moisture are primarily discussed by changing the conditions, such as different sizes, numbers, and locations of the vents.
The simulated results from CFD show that while considering the engine heat and the opening of Vent3, increasing the size of the vent can decrease the minimum velocity by 50% in Side regions but not in Corner regions. On the other hand, when the humidity inside is considered as well, the maximum relative humidity in Side and Corner regions are less 34.9% and 1%, respectively, as compared to the original vent. Different locations and numbers of vents and also engine heat effects are also discussed. While opening Vent3 and Vent6 at the same time, the performance of the minimum velocities in Corner and Side regions are about 19.4% and 50%, respectively, better than opening Vent3 only. However, the maximum relative humidity increases in both Corner and Side regions. Thus, increasing the vent size is a better choice to reduce the moisture inside the vehicle headlamps.
摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII
符號說明 X
第一章 緒論 1
1-1 前言 1
1-2 研究動機 1
1-3 文獻回顧 2
第二章 理論基礎 7
2-1 車燈內部水氣產生之原理及原因 7
2-2 車燈內部之熱傳遞 8
2-3 研究方法 10
第三章 車燈溫度量測之實驗 11
3-1 實驗設備 11
3-1-1 電源供應器 11
3-1-2 熱電偶溫度擷取系統 11
3-1-3 擬引擎室環境 12
3-2 實驗模型 12
3-3 實驗方法與結果 12
3-3-1 實驗方法 12
3-3-2 實驗結果 13
第四章 數值分析方法 14
4-1 基本假設 14
4-2 統御方程式 14
4-3 數值模型說明 18
4-3-1 數值模型之建構 18
4-3-2 數值網格之建立 18
4-3-3 材料參數之設定 20
4-3-4 邊界條件之給定 20
第五章 結果與討論 22
5-1 未改變通氣孔條件 22
5-1-1 於Case1環境條件下之探討 22
5-1-2 於Case2環境條件下之探討 23
5-1-3 於Case3環境條件下之探討 24
5-1-4 於Case4環境條件下之探討 24
5-2 改變通氣孔管徑 25
5-3 改變通氣孔位置及數量 26
第六章 結論與建議 28
6-1 結論 28
6-2 建議 29
參考文獻 30
表格 33
圖片 42
[1]Bielecki, J. W., Chang, M. and Poorman, T., “The effect of environmental conditions on moisture time in automotive lamps,” SAE paper No. 2003-01-0646.
[2] Moore, W. I. and Powers, C. R., “Using CFD for humidity clearing simulation of a composite headlamp,” SAE paper No. 2000-01-1598.
[3] Shiozawa, T., Ohishi, M., Yoneyama, M., Sakakibara, K. and Goto, S., “Analysis of moisture and natural convection inside an automotive headlamp by using CFD,” SAE paper No. 2005-01-1449.
[4] Okada, Y., Nouzawa, T. and Nakamura, T., “CFD analysis of the flow in an automotive headlamp,” JSAE Review 23, pp. 95-100, 2002.
[5]Fukai, S., “Development of a headlamp mist resistance evaluation method,” SAE paper No. 2001-01-0862.
[6] Hoines, L., Bielecki, J. and Cohn, M., “Effect of exterior airflow on automotive lamp venting,” SAE paper No. 1999-01-0696.
[7] Sousa, J., Vogada, J., Costa, M., Bensler, H., Freek, C. and Heath, D., “An experimental investigation of fluid flow and wall temperature distributions in an automotive headlight,” International Journal of Heat and Fluid Flow, vol. 26, pp. 709-721, 2005.
[8] Shiozawa, T., Yoneyama, M., Sakakibara, K., Goto, S., Tsuda, N., Saga, T. and Kobayashi, T., “Thermal air flow analysis of an automotive headlamp –The PIV measurement and the CFD calculation for a mass production model,” JSAE Review 22, pp. 245-252, 2001.
[9] Moore, W. I., Donovan, E. S. and Powers, C. R., “Temperature analysis of automotive headlamps using the ADINA-F coupled specular radiation and nature convention model ,” Computers and Structures, vol. 72, pp. 17-30, 1999.
[10]Hoines, L. and Jiao, J., “Effect of exterior airflow on automotive lamp venting,” SAE paper No.980316
[11]Bielecki, J. W., Chang, M. and Hoines, L., “Applying the law of diffusion to automotive lamp venting,” SAE paper No. 1999-01-0697.
[12]Deane, B. A., “On car evaluation-methods to understand condensation in headlamps,” SAE paper No. 2005-01-1450.
[13] Bielecki, J. W., Chang, M. and Poorman, T., “Understanding water vapor gradient conductive to condensation in an automotive lamp,” SAE paper No. 2005-01-1448.
[14]Moore, W. I. and Hilburger, F. K., “Development of a CFD model for simulating headlamp humidity clearing,” SAE paper No. 2001-01-0861.
[15]Langebach, J., “Experimental study of convection and radiation interaction in a headlight model using pressure variation,” Experimental Thermal and Fluid Science, vol. 32, pp. 521-528, 2007.
[16]Fischer, P., “CFD-Analysis and experimental verification of an automotive fog lamp,” SAE paper No. 2005-01-1921.
[17]Shiozawa, T., Nakanishi, A., Ozawa, T. and Oki, T., “Thermal air flow analysis of an automotive headlamp –The PIV measurement and the CFD simulation by using a skeleton model,” SAE paper No. 2000-01-0802.
[18]Bielecki, J. W., Chang, M. and Poorman, T., “Effect of moisture absorption in plastic on automotive lamp venting,” SAE paper No. 2004-01-0663.
[19]蔡豐欽, “熱傳遞,” 高立圖書有限公司, 1992
[20]Modest, M. F., 2nd ed, “Radiative heat transfer,” Academic Press, 1993.
[21]Tse, F. S. and Morse, I. E., “Measurement and instrumentation in engineering,” Marcel Dekker, Inc, 1989.
[22]“Fluent 6.3 Documentation,” Fluent Inc, 2006.
[23]“Gambit 2.4 Modeling Guide,” Fluent Inc, 2006.
[24]Bayazitoglu, Y. and Ozisik, M. N. “Elements of Heat Transfer,” McGraw-Hill, Inc, 1988.
[25]Incropera, F. P. and DeWitt, D. P., 5th ed, “Fundamentals of Heat and Mass Transfer,” John Wiley & Sons, Inc, 2002.
[26] MatWeb,http://www.matweb.com
[27] http://www.thermoworks.com
[28] ASHRAE , ASHRAE Handbook, Fundamentals
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