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姓名 陳彥宏(Yan-Hong Cheng )  查詢紙本館藏   畢業系所 機械工程研究所
論文名稱 低溫自動化倉儲系統之實驗量測與電腦模擬研究
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摘要(中) 台灣地處亞熱帶常年天候燠熱,容易降低農畜漁產食品的新鮮度,
因此不論原料或成品在製造、倉儲、運輸、銷售、消費均需保持在低溫
狀態下以維持生鮮度。而冷凍食品的品質優劣與冷凍倉儲內的氣流場及
溫度場有著密不可分的關係,因此如何描述和預測冷凍倉儲內的流場便
顯得相當重要。
本研究以實驗量測與電腦模擬兩種方法來探討大型冷凍倉儲(其倉儲大小為21m×2.45m×5.0m )的流場特性,研究中由於本實驗倉儲較大,故在量測上將其分為三個截面來量測,實驗使用熱敏電阻式風速(Thermistor-based anemometer )及熱電偶溫度計(Thermocouple )來量測倉儲中的氣流風速與倉儲內溫度變化。結果發現大型冷凍倉儲風管系統出風口之高風速與高紊流現象,進而提升庫內氣流混合效應,達到較
佳之均溫性。再以PHOENICS 軟體建立倉儲內氣流模式,詳細探討冷凍倉儲內的氣流變化,其中針對倉儲內不同的貨物擺設位置,貨物的擺設大致分為空庫、一層貨物、兩層貨物、滿庫等不同情形來分析當貨物擺設位置不同時,其氣流場的分佈情形。數值模擬的結果顯示在大致上的流場趨勢是符合的。目前的研究結果對冷凍倉儲內氣流動態的了解上有很大的意義,更期望此一研究(低溫倉儲庫內的溫度場與流場的了解),能作為往後在低溫倉儲領域設計與使用上的參考。
關鍵字(中) ★ PHOENICS
★  數值模擬
★  流場分析
★  風管系統
關鍵字(英) ★ cold store
★  PHOENICS
★  Simulation
論文目次 目 錄
頁次
摘要----------------------------------------------------------i
目錄--------------------------------------------------------- ii
表目錄------------------------------------------------------- v
圖目錄------------------------------------------------------- vi
符號說 明--------------------------------------------------------- xiii
第一章前言--------------------------------------------------- 1
1.1 研究動機------------------------------------------------- 1
1.2 研究目的------------------------------------------------- 2
第二章文獻回顧----------------------------------------------- 4
2.1 流場與溫度量測------------------------------------------- 4
2.2 CFD 電腦模擬--------------------------------------------- 7
第三章理論分析---------------------------------------------- 18
3.1 紊流流場--------------------------- ------------------- 18
3.2 紊流k-e 模式-------------------- ----------------------- 18
3.3 CFD 數值方法-------------------------------------------- 20
3.3.1 對流項與擴散項的差分-混合差分法---------------------- 21
3.3.2 SIMPLE 法則------------------------------------------- 22
3.4 模擬軟體------------------------------------------------ 23
3.4.1 PHOENICS 介紹----------------------------------------- 23
3.4.2 數值模擬之流場模型描述---------------------------------25
3.4.3 邊界條件之設立---------------------------------------- 25
第四章實驗方法法-------------------------------------------- 31
4.1 簡介---------------------------------------------------- 31
4.2 實驗量測設備-------------------------------------------- 33
4.2.1 熱電偶溫度計------------------------------------------ 33
4.2.2 熱敏電阻式風速計-------------------------------------- 33
4.2.3 資料擷取系統------------------------------------------ 34
4.3 實驗過程------------------------------------------------ 35
4.4 實驗步驟------------------------------------------------ 37
第五章結果與討論-------------------------------------------- 58
5.1 流場量測實驗結果---------------------------------------- 58
5.1.1 空庫量測(圖4.11 )----------------------------------- 59
5.1.2 一層貨物堆疊量測(圖4.11 )--------------------------- 60
5.1.3 一層貨物堆疊量測(圖4.12 )--------------------------- 61
5.1.4 一層貨物堆疊量測(圖4.13 )--------------------------- 61
5.1.5 二層貨物堆疊量測(圖4.14 )--------------------------- 62
5.1.6 二層貨物堆疊量測(圖4.15 )--------------------------- 62
5.1.7 滿庫情形(圖4.16 )----------------------------------- 63
5.2 溫度分布結果-------------------------------------------- 64
5.3 模擬與實驗結果比較-------------------------------------- 65
第六章結論與建議------------------------------------------- 100
參考文獻--------------------------------------------------- 101
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指導教授 楊建裕(Chien-Yuh Yang) 審核日期 2001-7-18
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