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研究生:尤銘鏘
研究生(外文):Ming-Chiang Yu
論文名稱:瓣狀噴射壓縮器之性能研究
論文名稱(外文):An Experimental Study of the Ejector Using Petal Nozzle
指導教授:陳瑤明
指導教授(外文):Yau-Ming Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:112
中文關鍵詞:噴射壓縮器瓣狀噴嘴性能
外文關鍵詞:ejectorpetal nozzleperformance
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本論文分別以實驗及理論的方式,針對以水蒸氣為工質的瓣狀噴射壓縮器進行性能分析。在實驗方面,分別以AR值(噴射壓縮器等截面段與主噴嘴喉部面積比)、混合段長度與瓣狀噴嘴的瓣數三種參數對瓣狀噴射壓縮器進行性能測試。實驗結果發現瓣狀噴射壓縮器之基本特性和傳統噴射壓縮器相似,唯在相同工況下,瓣狀噴射壓縮器具有較高的極限背壓。對於不同參數的影響效應,我們發現隨AR值增加,抽吸比會隨之增加,但增壓比卻會先增後減,故存在一最佳AR值,使瓣狀噴射壓縮器在抽吸和增壓性能上有最佳的協調。在混合段長度效應上,發現在AR值低於最佳值時,藉由大幅縮短混合段長度使流體與壁面的摩擦損失變少,因而噴射壓縮器的性能得以提昇;但在AR值高於最佳值時,由於混合流體流量大幅增加,瓣狀噴嘴快速混合能力因本身尺寸關係受到限制,使其性能不因混合段長度縮短而提昇。至於改變瓣狀噴嘴之瓣數方面,使用四、五、六瓣之瓣狀噴嘴進行測試,結果發現對同一根噴射壓縮器其性能相差不大。
在理論方面,本文採用一維可壓縮流理論探討噴射壓縮器之性能,發現等熵效率因子對噴射壓縮器之性能影響甚大,經由實驗與理論分析結果顯示,使用瓣狀噴嘴可使主副流體的混合效率較傳統噴嘴增加約5%∼10%,證明瓣狀噴嘴確能有效提昇噴射壓縮器之性能。

An experimental study was conducted to investigate the performance of steam-jet ejector with petal nozzle. Ejectors with different area ratio values (AR), different length of mixing section and different kinds of petal nozzles were tested as parameters in this paper. In addition, a simple, one-dimensional ejector theory is used to analyze the performance of ejector.
From the experimental results, it is found that the performance of ejector with petal nozzle first enhances and then declines with increasing AR. From our analysis, an optimum value exists between AR=200~250. As AR is smaller than the optimum value, the performance of ejector with petal nozzle can be enhanced for largely shortening length of mixing section. On the other hand, as AR is larger, the performance declines with shortening length of mixing section. Moreover, four-lobed, five-lobed and six-lobed petal nozzles adapted with the same ejector were tested. The results show that their performance curves vary in a narrow band. So the number of lobes of petal nozzle has little influence on the performance of ejector.
In the theoretical analysis, the results show that the isentropic efficiency of mixing (ηm) affects the performance of ejector profoundly. In addition, the study compares experimental results with theoretical ones. They prove that the isentropic efficiency of mixing can be enhanced about 5~10% when the petal nozzle is adapted. Therefore the performance of ejector can be enhanced by using petal nozzle.

第一章 導 論1
§1-1 前言1
§1-2 噴射壓縮器工作原理2
§1-3 噴射式壓縮器應用於冷氣系統之工作原理3
§1-4 文獻回顧4
§1-4-1 傳統式噴射壓縮器4
§1-4-2 瓣狀噴嘴部份10
§1-5 研究目的15
第二章 實驗設備與步驟17
§2-1 實驗設備17
§2-1-1 系統構件規格17
§2-1-2 量測儀器規格19
§2-2 實驗參數21
§2-2-1 主噴嘴尺寸21
§2-2-2 噴射壓縮器測試段尺寸22
§2-2-3 實驗操作狀況23
§2-3 實驗步驟與結果計算步驟23
§2-3-1 實驗步驟23
§2-3-2 主流體質量流率量測( )25
§2-3-3 副流體質量流率量測( )25
§2-3-4 實驗結果計算25
§2-4 實驗誤差分析26
第三章 實驗結果與討論28
§3-1 瓣狀噴射壓縮器的基本特性28
§3-1-1 瓣狀噴嘴之基本行為28
§3-1-2 冷凝器壓力之影響29
§3-1-3 蒸氣產生器壓力之影響30
§3-1-4 蒸氣蒸發器壓力之影響31
§3-1-5 噴射壓縮器的性能分析31
§3-2 噴射壓縮器幾何尺寸對其性能之影響34
§3-2-1 AR值對性能之影響34
§3-2-2 混合段長度的影響39
§3-3 不同主噴嘴形式對噴射壓縮器性能之影響44
§3-3-1 不同瓣數對性能之影響44
§3-3-2 螺旋式噴嘴對性能之影響49
§3-4 本章實驗結果結論51
第四章 理論分析53
§4-1 理論分析模式53
§4-1-1 統御方程式53
§4-1-2 理論計算方法56
§4-2 以理論分析實驗結果57
第五章 結論與建議61
§5-1 結論61
§5-2 建議63
參考文獻64

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