(44.192.112.123) 您好!臺灣時間:2021/03/01 03:11
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:何順暉
研究生(外文):Shun-Hui Ho
論文名稱:二行程引擎掃氣效率之數值模擬分析
論文名稱(外文):Numerical Simulation of Scavenging Efficiency of Two-Stroke Engines
指導教授:戴昌賢戴昌賢引用關係蔡建雄蔡建雄引用關係
指導教授(外文):Chang-Hsien TaiChien-Hsiung Tsai
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:車輛工程系所
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:2008
畢業學年度:96
語文別:中文
論文頁數:72
中文關鍵詞:掃氣效率捕氣效率掃氣口
外文關鍵詞:scavenging efficiencytrapping efficiencytransfer port
相關次數:
  • 被引用被引用:0
  • 點閱點閱:1122
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
論文摘要內容:
本文以計算流體力學(CFD)方法探討三維二行程引擎之掃氣效率。二行程引擎的性能關鍵是在於掃氣過程的優劣,掃氣的優劣指標為掃氣效率下與捕氣效率。在掃氣過程中活塞的形狀,掃氣口的位置、方向及角度,掃氣口流道角度,將影響引擎的掃氣效率。文中探討CO2由掃氣口進入汽缸內所行經的路徑(短路、廻環掃氣、中心損失、壁面迴路)對掃氣效率及捕氣效率的影響。本研究針對活塞頂面的幾何形狀,掃氣口及掃氣口流道的角度進行分析,結果顯示改變掃氣口流道角度(50°)能提升4%的掃氣效率及捕氣效率。針對改變掃氣口流道(50°)做分析,將排氣行程角度減少9°,能使掃氣效率及捕氣效率均提升13%。經研究結果發現原始引擎性能的關鍵在於排氣角度設計過大。
The Contents of Abstract in this Thesis:
In this paper, Computational Fluid Dynamics (CFD) method was used to study the scavenging efficiency by a 3D two-stroke engine. The scavenge process of a two-stroke engine is one of main factor to evaluate the engine performance. The geometry of piston surface, and the angle of transfer port and channel will affect the scavenging efficiency. CO2 flows in to the cylinder from channel are decided by the following four flow paths short-circuiting, loop scavenging, central loss and near-wall flow for scavenging efficiency (SE) and trapping efficiency (TE). In the study, three kinds of geometrics of piston surface, and three different degrees of transfer port and channels. In the results, the 50° channel of transfer port can enhance 4% SE and TE. And to reduced 9° of exhaust process in this case, the SE and TE will enhance 13%. Actually, the exhaust process of the origin engine in too long.
目錄
摘要 I
謝誌 III
目錄 IV
圖目錄 VI
符號索引 X
希臘字母 XII
第1章 前言 1
1.1 研究動機 1
1.2 文獻回顧 2
1.3 基本介紹 4
1.3.1 掃氣型式 4
1.3.2 流體路徑 7
1.3.3 掃氣模型 11
1.4 SINGLE-CYCLE TEST 16
1.5 研究目的 17
第2章 研究方法 18
2.1 數學模式 18
2.1.1 基本假設 18
2.1.2 統御方程式 18
2.1.3 紊流模型 20
2.2 邊界條件 21
2.3 數值方法 23
2.3.1 離散化 23
2.3.2 一階上風法 24
2.3.3 SIMPLE 演算法 25
2.4 格點系統 27
2.4.1 格點驗證 28
2.5 滑動格點 29
2.6 初始條件 30
第3章 結果與討論 32
3.1 二行程掃氣引擎濃度場及效率分析 32
3.2 掃、排氣行程效率分析 60
第4章 結論與未來展望 69
4.1 結論 69
4.2 未來展望 69
參考文獻 70
作者簡介 72
參考文獻

1.蔡欣正,1987,內燃機的理論與實際,聯經,台北市,第111-140頁。
2.Richard, S.,1995,內燃機,梁乃文譯,新文京,第277-298頁。
3.Benson, R. S., and Whitehouse, N. D.,內燃機,賴玲瑩譯,科技,第179-181頁。
4.王又弘,2000,單缸二行程引擎二次空氣系統特性分析,碩士論文,國立中興大學,機械工程研究所,台中。
5.張聖宗,2002,單缸二行程引擎二次空氣系統設計之分析,碩士論文,國立中興大學,機械工程研究所,台中。
6.蘇振權,2007,史特靈引擎流場之數值模擬與研究,碩士論文,國立屏東科技大學,車輛工程研究所,屏東。
7.Blair, G. P., 1994, “Design and Simulation of Twp-Stroke Engines,” Society of Automotive Engineers, America .
8.Nuti, M., 1998, “Emissions from Two-Stroke Engines,”, Society of Automotive Engineers, America .
9.Cunningham, G., Kee, R. J., Kenny, R. G. and Skelton, W. J., 1999, “Development of a Stratified Scavenging System for Small Capacity Two-Stroke Engines,” SAE 1999-01-3270.
10.Zahn, W., Rosskamp, H., Raffenberg, M. and Klimmek, A., 2000, “Analysis of a Stratified Charging Concept for High-Performance Two-Stroke Engines,” SAE 2000-01-0900.
11.Rosskamp, H., Klimmek, A. and Pretzsch, P., 2001,“Scavenge Loss Mechanisms and Their Driving Forces in Loop-Scavenged High-Performance Two-Stroke Engines,” SAE 2001-01-1826.
12.Ohtsuji, T., Kobayashi, B., 2002,“Investiation of low emission two-stroke cycle engine chainsaw,” SAE 2002-32-1841.
13.Zeng, Y. and Strauss, S., 2003, “Modeling of Scavenging and Plugging in a Twin-Cylinder Two Stroke Engine Using CFD,” SAE 2003-32-0020.
14.Chiatti, G. and Chiavola, O., 2003,“Scavenging Efficiency and Combustion Performance in 2T Gasoline Engine,” SAE 2003-32-0030.
15.Mingrui, W., Yongchang, L., Hua, W. and Yusheng, Z., 2004,“Numerical Simulation & Experimental Investigation of the Stratified Scavenging System of Two-Stroke Gasoline Engine,” SAE 2004-01-1872.
16.Fleck, B. J., Fleck, R. and Kee, R. J., 2004,“Validation of a Computer Simulation of a High Performance Two-Stroke Motorcycle Racing Engine,” SAE 2004-01-3561.
17.Hong, G., Mack, A.N.F., Menolotto, F., Jamieson, C. S. and Main, S. G., 2004,“Numerical Visualization of Air Short-Circuiting in a Small Two-Stroke SI Engine,” SAE 2004-32-0009.
18.Rothbauer, R. J. and Almbauer, R. A., 2006,“A Multidimensional Interface for the Predictive CFD Simulation of the 2-Stroke Engine,” SAE 2006-32-0059.
19.Fleck, B., 2006,“CFD Simulation and Validation of the Scavenging Process in a 125cc 2-Stroke Racing Engine,” SAE 2006-32-0061.
20.Wijeyakulasuriya, S. D., 2007,“Simulation of Scavenging in a Small Two-Stroke Gasoline Engine Typical in South Asia,” SAE 2007-01-3554.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔