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論文中文名稱:汽油缸內直噴渦輪增壓引擎進氣道分析 [以論文名稱查詢館藏系統]
論文英文名稱:Analysis of the Intake Ports Flows of a Gasoline Direct Injection Turbocharged Engine [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:機電學院
系所名稱:車輛工程系
畢業學年度:107
畢業學期:第一學期
出版年度:107
中文姓名:陳俊瑋
英文姓名:CHEN,Jyun-Wei
研究生學號:105448053
學位類別:碩士
語文別:中文
口試日期:2018/07/23
論文頁數:76
指導教授中文名:吳浴沂
指導教授英文名:WU,Yuh-Yih
口試委員中文名:蘇評揮;林士賢;陳柏全
口試委員英文名:SU,Ping-Hui;CHEN,Bo-Chen
中文關鍵詞:汽油直接噴射渦輪增壓流量係數氣道試驗
英文關鍵詞:Gasoline Direct Injection (GDI)Turbo chargeFlow coefficientFlowbench
論文中文摘要:汽油直接噴射( Gasoline Direct Injection, GDI )引擎為未來引擎發展趨勢,其中進氣道設計影響容積效率與空氣運動,大幅影響內燃機效率,但是複雜的缸內流場,若無昂貴的質點影像速度儀等設備是無法悉知,因此本研究目的針對目標引擎進氣道建立氣道實驗及計算流體力學(CFD)模型,來快速評估分析氣道性能及設計,並且搭配氣道實驗進行模擬驗證。研究結果,發現目標引擎進氣道有流道縮口,造成流量係數偏低。因而進行該引擎進氣道的實驗與模擬,探討流量係數與氣流運動。
首先針對目標氣道模型利用ANSYS內建之幾何模組進行修改,接著建立數值網格,然後選定數值模型後,再參照實驗數據設定初始條件進行穩態流場氣道幾何模擬,最後探討氣道幾何對缸內流場之影響。本論文提供一種較為便宜快速的方式來評估汽缸頭氣道性能。
比對氣道流量發現,所建立之模型流量誤差皆在10%內,而流場之模擬時可發現目標引擎主要為依靠進氣道下緣使氣流產生滾流運動,但是因為氣道幾何為產生滾流運動,而產生較大進氣阻力減少進氣道流量係數。
論文英文摘要:Gasoline Direct Injection (GDI) engine is the trend of future engine development. The intake ports’ geometric design affects the volumetric efficiency and in-cylinder air motion, which also greatly affects the thermal efficiency of the engine. However, in-cylinder flow fields are difficult to observe without particle image velocimetry. Therefore, Computational Fluid Dynamics was employed to simulate the performance of intake ports for the target engine and validated the test data from the flow bench. The simulation showed that the shrinkage of the intake ports resulting in low flow coefficient.
The intake port model was preprocessed by ANSYS built-in geometry module, then the numerical grids were established and the numerical model was selected. After that, the initial conditions were set up according to the experimental data. Finally, the effects of intake port geometries on in-cylinder flow characteristics were investigated. This study provides a rapid and inexpensive way to evaluate intake ports performance.
The simulation errors of the amount of air flow are within 10% as compared with the experimental data. The simulation clearly demonstrates the tumble motions are formed by the shrinkages on the intake ports that generates greater intake resistance while reducing the intake flow coefficient.
論文目次:摘 要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
表目錄 vi
圖目錄 vii
第一章 前言 1
1.1 研究背景與動機 1
1.2 文獻回顧 5
1.3 研究目的及方法 11
第二章 引擎氣道性能評估 12
2.1氣道設計原理 12
2.1.1 氣體流動與滾流(或是渦流)氣流之形成 12
2.1.2 氣道設計觀念 14
2.2 儀器設備 15
2.2.1 氣流試驗台 15
2.2.2 渦流量測儀 16
2.2.3 治具 17
2.2.4 大氣壓力感知器 18
2.3 氣流試驗 19
2.3.1 試驗原理 19
2.2.4 試驗步驟 20
2.2.5 計算公式 20
第三章 CFD數值模型建立 24
3.1幾何模型建立 24
3.2 網格劃分 26
3.3 數值模型 28
3.3.1能量模型 28
3.3.2紊流模型 30
3.3.3 演算法選定 30
第四章 結果與討論 35
4.1氣道流量及渦流試驗結果 35
4.2氣道滾流結果 36
4.3氣道穩態模擬結果 38
4.3.1渦流模擬結果 39
4.3.2滾流模擬結果 44
第五章 結論與未來展望 63
5.1 結論 63
5.2 未來展望 63
參考文獻 64
符號彙編 71
著作發表 76
論文參考文獻:參考文獻

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