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dc.contributorHou-Chien Changen_US
dc.contributor.authorLin, Po-Hsuanen_US
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dc.description.abstract隨著科技進步,汽車已經成為日常生活中的一部分,加上現代人追求的生活品質越來越高,如何得到更舒適的環境是一大議題。早期車內流場的研究皆以實車實驗去模擬,不但花費時間且又耗費成本,如今電腦系統的發達,越來越多研究人員使用數值模擬的方式來分析汽車室內流場的變化。受到太陽日照的影響,放置於戶外的車體內部溫度升高,使得人員進入車體會感到悶熱且不舒適,本文研究人員在進入車內前,使用物理方法將車內溫度有效下降,接著再進入車內,如此一來,既能增加後續人員進入車內的舒適,又能使空調系統發揮更大的作用。太陽日照方面以熱通量代替,並且令擋風玻璃為一熱源,考慮κ-ε紊流模式,將上述條件匯入商業套裝軟體FLUENT以求得車內溫度場的變化。 本文討論不同環境條件下,能使車內溫度下降最快的方法,車門開啟與關閉的排列組合一共有7種,模擬這7種情形之後得到的結果顯示,在後座兩車門打開及全部車門打開的條件下,車內溫度能下降較快;而時間方面,0~5秒內的流場變化較為劇烈,5~10秒的溫度場不太改變,所以推論開始動作5秒後,車內流場以逐漸達穩定;速度方面,開關門為45度產生的風速大於30度產生的風速,風速較快也導致車內溫度下降較明顯,結合以上的結果,得到一最佳化條件,此結果可作為日後人員進入受到太陽日照影響的車體之前參考之依據。zh_TW
dc.description.abstractWith the technology improving, car has been an important part of human activity, people have high quality of life, it becomes a great issue to get better environment. Previous researches related to car interior field flow were based on experimental method, not only waste time but also take a lot of cost, nowadays ,with the computer system great developing, more researchers analyze the change of car interior field flow by numerical method. Since the exposure to the sunlight, car parked outside get higher temperature, making people get in the car feel muggy and uncomfortable. Here we use some physical methods to reduce the interior temperature before getting in the car so that people will feel more comfortable and the air-conditioner play the greater role within vehicle. The solar radiation is replaced of the constant heat flux and the windshield is regard as a heat source, using κ-ε tabulate modal, all of the above conditions were imported to FLUENT to calculate the change of temperature in the car interior field. We discuss the best way to lower the interior temperature under different door to open and close, there are seven combinations between different doors to open and close. After the simulation, result shows that under the two conditions that the two backdoors and all of the doors are opened cooling the fastest. From the prospective of time, the field flow changes strictly during the 0sec to 5sec, during the 5sec to 10sec, the temperature changes rarely, so the interior field flow reaches steady state. In addition to velocity field, the wind speed caused by door switching 45 degrees is faster than door switching 30 degrees, the faster wind speed, the more obvious temperature dropping. In conclusion, we can conclude the best conditions, which can be a reference before people getting in the car exposure to the sunlight.en_US
dc.description.tableofcontents摘要 i Abstract ii 目錄 iii 圖目錄 v 表目錄 vii 第一章 前言 1 第二章 文獻回顧 2 2-1車內通風的重要性 2 2-1-1光與熱之關係 2 2-1-2車內高溫的影響 3 2-1-3降低車內高溫的方法 4 2-2 室內環境因子評估指標 7 2-2-1 換氣率之評估原則 7 2-2-2室內空氣齡指標與空氣交換率之評估原則 7 2-2-3通風型式簡介 9 2-3計算流體力學 11 第三章 系統模型 16 3-1方程式使用符號列表 16 3-2 研究內容與設計方法 16 3-2-1統御方程式 17 3-2-2紊流模型方程式 19 3-2-3紊流模式壁面函數 20 3-3數值模型 23 3-3-1幾何外型 23 3-3-2網格建構 24 3-4 邊界條件設定 26 3-5參數設定 28 第四章 數值計算 29 4-1 網格獨立性測試 29 4-2求解方法 30 4-3數值演算法 33 4-4 收斂準則 37 4-5演算流程圖 38 第五章 結果與討論 39 5-1 開關門角度對於車內流場的影響 39 5-1-1 兩種角度對於車內流場流動的模擬與分析 39 5-1-2 兩種角度對於車內溫度場的影響 39 5-2 不同車門開關對車內流場的影響 41 5-2-1 單一出口車內流場流動的模擬與分析 41 5-2-2 單一出口溫度的模擬與分析 41 5-2-3 多個出口車內流場流動的模擬與分析 49 5-2-4 多個出口溫度的模擬與分析 53 第六章 結論與未來展望 58 參考文獻 59 附錄 63zh_TW
dc.subjectForced Convectionen_US
dc.subjectTurbulent Flowen_US
dc.titleThe Simulative Study of Temperature Variation in Vehicles with Forced Convectionen_US
dc.typeThesis and Dissertationzh_TW
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