本研究主要目的在於同時利用計算流體力學之數值模擬與縮小模型阻力係數之風洞量測兩種技術，探討小型競賽車輛之外流場與阻力係數，以作為外形改善之依據。首先利用1比8縮小模型在風洞內作阻力係數測試及流動觀察，再採用不同紊流模型，對風洞實驗的縮小模型狀況做數值模擬，將模擬結果與實驗結果做比較，以選定較適當的紊流模型。最後利用選定的紊流模型與數值計算程序，探討影響小型競賽車輛風阻係數之重要參數，例如雷諾數、前擋板之設計、底板傾斜角度、與駕駛者姿態等。
實驗與數值模擬結果比較顯示，數值計算採用 紊流模型所得結果與風洞實驗數據最相吻合。利用此紊流模型做高雷諾數之延伸，由數值計算結果提出涵蓋實際應用範圍的風阻係數曲線。對整車外型，尤其是前擋板與前整流罩，作減低風阻之設計後，新設計原型車之風阻比市售車有明顯的降低。參數探討的結果顯示，前擋板角度之設計以及跟車距離影響風阻較為明顯，駕駛者姿態對風阻的影響決定於最後形成的壓力場分布情形。

The main objective of this study is to investigate the external flow field and drag coefficient for Go-karts, by using both numerical modeling with a computational fluid dynamics package and the measurement of the drag coefficient with a scaled model in a wind tunnel. At first, a 1:8 scale model was used in a wind tunnel test to measure its drag coefficient and to conduct flow visualization. The experimental data was then used to select the most suitable turbulence model for the simulation of Go-kart aerodynamics. Finally, the chosen turbulence model and the computational procedure were used to investigate important factors that influence the drag coefficient of a Go-kart, such as the Reynolds number, the design of the front panel, the orientation angle of the chassis, and the pose of the driver.
Comparisons of the experimental and numerical results show that turbulence model gives the best agreement with the measured data. By extending this turbulence model to higher Reynolds numbers, complete curves of drag coefficient were presented which cover the parameter range for real applications. New phase designs with the consideration of drag, especially the change of the front fairing and the front panel, showed obvious reduction in the drag when compared to a commercially available Go-kart. Among the investigated parameters, both the angle of the front panel and the distance between two carts have significant influence on the drag. The influence of the driver’s pose is uncertain, depending on the resulting pressure distribution.

第一章 緒論　　　　　　　　　　　　　　　　　　　
1.1研究背景　　　　　　　　 　　　 　　　　
1.2研究動機　　　　　　　　 　　　 　　　　
第二章 文獻回顧
2.1空氣動力學與造型探討
2.2 CFD數值模擬應用於車輛
第三章 研究方法
3.1 風洞實驗
3.2數值分析程序
3.3數值分析程序
3.4統御方程式
3.5 紊流方程式
3.6 數值求界方法
3.7收斂條件
3.8 鬆弛因子
3.9 網格數量測試
3.10 動力相似驗證
3.11 計算區域驗證
第四章 結果與討論
4.1風洞條件下實驗與模擬比較結果
4.1.1 SI模型實驗與模擬結果
4.1.2 PhaseI模型實驗與模擬結果
4.1.3 PhaseII模型實驗與模擬結果
4.1.4 三種車型之模擬結果比較
4.2.改變駕駛姿勢支實驗與模擬結果
4.3.跟車實驗與模擬結
4.4.三種車型於自由區域下之模擬結果
4.5自由區域下改變front panel角度模擬結果
4.6自由區域下各零組件模擬結果
4.7與自由區域下加底板之模擬結果
第五章 結論與建議
5.1 結論
5.2 建議
參考文獻

[1] 經濟部工業局，2002，「經濟部工業局推動新興產業之發展政策與方向新聞稿」，1 年3 月5 日。
[2] 李添財，2005，汽車空氣動力學，全華科技圖書股份有限公司。
[3] 秦大鈞，1983，航空動力學概論，國立編譯館主編。
[4] Hirata, Koichi and Syusuke Kawai, 2001, Hydrodynamic
Performance of Stream-lined Body, Prototype Fish Robot,
UPF-2001, National Maritime Research Institude
[5] 楊文昌，2000，基礎流體力學，五南圖書出版公司。
[6] 邱懷慶，2008，低風阻省油車之造型設計研究，私立大葉大學設計研究所碩士論文
[7] Jawad ,B. A. and Longnecker M. M. 2001, “Aerodynamic
Evaluation on Formula SAE Vehicles”,SAE paper
No.2001-01-1270.
[8] 陳凡，2003 http://www.tier.org.tw/energymonthly/
outdatecontent.asp. ReportIssue=9201&Page=18
[9] 文黃瑋，2002，太陽能車之外型分析研究，台灣大學機械工程研究所碩士論文。
[10] 林家緯，2006，低風阻車輛外型設計方法，台灣大學機械工程學研究所碩士論文。
[11] Makowski M. V., 1964, “Flow Around Circular Cylinder-A
Kaleidoscope of Challenging Fluid Phenomea,”Symposium of
Fully Seprated Flows, ASME, Philadelp hia, pa., pp.102-118.
[12] Kleber, A., 2001 “Simulation of Air Flow Around an
OPELASTRA Vehicle with FLUENT,” Journal Articles by
Fluent Software Users,Fluent Inc.,JA132.
[13] Kee J.D, Kim. M.S and Lee B.C, 2001,” The COANDA Flow
Control and NewtonianConcept Approach to Achieve
DragReduction of Passenger Vehicle”,SAE paper
No.2001-01-1267
[14] Lietz, R., Pien, W., Hands, D., and McGrew J., 1999,” Light
Truck Aerodynamic Simulations Using a Lattice Gas Based
Simulation Technique”, SAE paper No. 1999-01-3756.
[15] Ramnefors, M., Bensryd, R., Holmberg, E., and Perzon, S.,
1996, “Accuracy of Drag Predictions on Cars Using CFD –
Effect of Grid Refinement and Turbulence Models,” SAE
paper No. 960681.
[16] Han, T., Sumantran, V., Harris, C., Kuzmanov, T., Huebler, M.
1996,”Flow-Field Simulations of Three Simplified Vehicle
Shapes and Comparisons with Experimental Measurements”,
SAE paper No. 960678.
[17] Zhu .X and Gleason. M,2007,”A CFD Application of Surface
Morphing for Vehicle Exterior Development” SAE paper
No.2007-01-0110
[18] Yang .Z, Schenkel. M and Fadler. G. J,2003,” Corrections for
the Pressure Gradient Effecton Vehicle Aerodynamic Drag”
SAE paper No.2003-01-0935
[19] Ashok D. Khondge, Sandeep D. Sovani and Bipin S. Lokhande
Fluent Inc.,2004,” Simulation of the Flow-Field Around
aGeneric Tractor-Trailer Truck” SAE paper No.2004-01-1147
[20] Brzustowicz .J. P. and Lounsberry .T. H,2002,.” Experimental
& Computational Simulations Utilized During the
Aerodynamic Development of the DodgeIntrepid R/T Race
Car” SAE paper No.2002-01-3334
[21] Williams, J., Quinlan, W.J., Hackett, J.E., Thompson, S.A.,
Marinaccio, T., and Robertson, A., 1994, “A Calibration Study
of CFD for Automotive Shapes and CD,” SAE paper No.
940323.
[22] Laise, T.D., and Bayless, K.S., 1994, “Aerodynamic
Development of a Successful NASCAR Winston Cup Race
Car,” SAE paper No. 942521.
[23] Launder, B.E., and Spalding, D.B., 1972, “Lectures in
Mathema-Tical Model of Turbulence.” Academic Press,
London, England.
[24] Patankar, S.V., 1980, “Numerical Heat Transfer and Fluid
Flow . ”Hemisphere Publishing Corp., Washington DC.
[25] 龔棉英，2006，｢新型風力渦輪於設計階段之空氣動力特性數值分析｣，私立大葉大學機械工程研究所碩士論文。
[26] Cooper .K. R.,1982,” Correlation Experience with theSAE
Wind Tunnel Test Procedurefor Trucks and Buses” SAE paper No. 820375
[27] Fluent Inc., 2002, Formula 1 External Aerodynamics,
Application Briefs from Fluent, EX166.
[28] 陳立昀，2005，｢波形板流道熱傳與壓降的三維數值模擬
｣，私立大葉大學機械工程研究所碩士論文。
[29] 賴春源，2007，｢利用多孔材料於衝擊冷卻熱傳增強的實驗
探 討｣，私立大葉大學機械工程研究所碩士論文。
[30] 王玉仁，2004，｢車輛超車流場之數值模擬｣，國立屏東科技
大學車輛工程系碩士論文。
[31] 歐陽績譯，1983，空氣動力學。
[32] Fluent 6.2, Fluent Inc., 2003.
[33] 杜鳳棋，1995，流體力學(下)，高立圖書有限公司。
[34] Alfa Romeo147,http://www.channel4.com/4car/gallery/A/
alfa-romeo/147/147_page_8.html
[35] Audi Apollo, http://www.fourtitude.com/news/publish
/Features/printer_1238.s- html
[36] Chevrolet Corvette05,http://www.channel4.com/4car
/gallery/C/chevrolet/corv- ette.html
[37] ChevroletCorvette84,http://www.hemmings.com/index.cfm
/fuseaction/popups. edi toria l/id/285
[38] FerrariF430,http://www.automobilemag.com/reviews/coupes
/0501_ferrari_f43- 0/ index1.html
[39] Ford Probe V, http://www.vikart.demon.co.uk/probe/
[40] Honda Dream,http://www.ecplanet.com/foto.php?imm=
KsZC.jpg &epochi=10- 64805321
[41] HondaImas, http://vtec.net/news/news-item?
news_item_id=162473
[42] Lamborghini Gallardo,
http://www.autobuy.com.cn/new_cars/showcar.html_?
arsid=593
[43] Lexus ES300,http://www.autosite.com/content/research/index
.cfm/action/show- ticle/AID/137791
[44] Mercedes Bionic Diesel, http://www.aiada.org/
article.asp?id=42000
[45] Mercedes C111,http://www.classicdriver.com/uk/magazine/
3200.asp
[46] NASA, http://www.grc.nasa.gov/WWW/K-12/airplane/
shaped.html
[47] Net Car Show, http://www.netcarshow.com
[48] Plymouth Prowler, http://www.theautochannel.com/news
/2002/02/26/03634- 8.html
[49] Porsche 911 GT2, http://content3.us.porsche.com
/prod/911/gt2.nsf/pmeenglish/ aero- dynamics
[50] Rumpler Teardrop, http://www.deutsches-museum.de/ausstell/
dauer/kfz/e_ kfz- 2.htm
[51] Speedy Cars, http://www.speedycars.net
[52] UBCSuper mileage car, http://www.greencarcongress
.com/2005/06/high_scho- ol_tea.html
[53] UBCST Supermileage car, http://www.fluent.com/about/news/
newsletters/04 v1- 3i2/a27.htm
[54] VW1L, http://greatchange.org/footnotes-1-liter-car.html