跳到主要內容

臺灣博碩士論文加值系統

(44.200.86.95) 您好!臺灣時間:2024/05/28 09:39
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:潘思澎
研究生(外文):Szu-Peng Pan
論文名稱:二相流模式探討大雨中飛機空氣動力特性分析
論文名稱(外文):Aerodynamic Performance Analysis Under the Influence of Heavy Rain by Using Two-Phase Flow Approach
指導教授:宛 同
指導教授(外文):Tung Wan
學位類別:碩士
校院名稱:淡江大學
系所名稱:航空太空工程學系碩士班
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:2009
畢業學年度:97
語文別:英文
論文頁數:62
中文關鍵詞:大雨二相流空氣動力學
外文關鍵詞:Heavy RainTwo Phase FlowAerodynamics
相關次數:
  • 被引用被引用:0
  • 點閱點閱:221
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
對飛行安全有害的氣象現諸如風切、雷雨、冰或雪這些危險因子是大眾所了解的,而大雨對飛機所造成的氣動力損失則是正在進行中的研究主題且需要長遠的進行研究。除了本研究團隊在2003年曾經針對大雨對機翼性能分析有過分析之外,近10年來不論是在實驗或是在數值計算方面已鮮少有相關的研究。本研究首先對回顧前人所做的因大雨效應而使得飛機性能減低的研究並使用數值方法做進一步的探討,並使用NACA 64-210二維機翼和現有的商用軟體FLUENT,大雨的模擬則是採用FLUENT內的二相流 (Two-Phase Flow)離散相的DPM模組(Discrete Phase Model)來完成並計算空氣動力特性的改變,如升阻力係數和攻角等。本研究首先進行乾淨機翼的驗證工作,並成功模擬出二維機翼在大雨下的性能衰減,其衰減程度會隨著降雨量的增加而越大,而失速的情形也有提前發生的現象,研究發現升力係數減少、阻力係數增加的程度與Bezos 實驗結果相近。本研究所得到的量化資料能夠能對航空公司運作上有所助益,長遠來說,可以使得飛機飛行的更安全。
The detrimental effects of some meteorological phenomenon such as wind shear, thunderstorm, ice/snow etc, to aviation safety are relatively well known. But aerodynamic influences due to heavy rain are still the on-going research subject, and needs further investigation. But for the past decade there are neither experimental nor numerical researches about heavy rain except our research team conducted at 2003. This paper first review some research finding of heavy rain effects on aerodynamic performance degradation. Secondly, a commercial CFD package FLUENT and preprocessing tool Gambit is used as our main analysis tools, and the simulation of rain is accomplished by using Two-Phase Flow approach’s Discrete Phase Model (DPM) provided by FLUENT. The results shows that this research successfully simulate the aerodynamic efficiency degradation under the heavy rain. The degradation rate increases with the rain rate, and the premature stall phenomenon is also discovered. It is expected that the quantitative information gained in this paper could be useful to the operational airline industry, and greater effort should put in this direction to further improve aviation safety.
Contents
Contents III
List of Tables IV
List of Figures V
Nomenclature VII
Chapter 1 Introduction 1
Chapter 2 Research Background 5
2.1 Literature Review 5
2.2 Characteristics of Rain on Airfoil 7
2.3 Physics and Influences of an Airfoil in Rain 9
Chapter 3 Numerical Modeling 13
3.1 Grid Generation 13
3.2 Turbulence Modeling 15
3.3 Flow Solver 18
3.4 Multi-Phase Flow Approach 22
3.5 Verification 29
Chapter 4 Results and Discussion 32
Chapter 5 Conclusions 50
References 51
Appendix 53

List of Tables
Table 4-2 Drag coefficients error percentage for 3 numerical results comparing to experimental data 34
Table 4-3 Numerical results of lift coefficients degradation percentage for 2 rain rate cases 39
Table 4-4 Experimental lift coefficients degradation percentage for 2 rain rate cases 39
Table 4-5 Numerical results of drag coefficients increasing percentage for 2 rain rate cases 41
Table 4-6 Experimental drag coefficients increasing percentage for 2 rain rate cases 41
Table 4-7 Numerical results of lift to drag (L/D) value degradation percentage for 2 rain rate cases 43
Table 4-8 Experimental results of lift to drag (L/D) value degradation percentage for 2 rain rate cases 44

List of Figures
Fig 2-1 Sketch of water behavior on top of wing surface [2] 9
Fig 2-2 Characteristics of four surface water flow regions: 1. droplet-impact region; 2. film-convection region; 3. rivulet-formation region; and 4. droplet-convection region [12]. 9
Fig 2-3 Streamline patterns at stalled angle of attack for two different surface conditions (a) Stall at clean wing configuration, (b) Stall at contaminated (rain) surface. 12
Fig 3-1 Far mesh of NACA 64-210 14
Fig 3-2 Near mesh of NACA 64-210 14
Fig 3-3 The solution loops of the pressure-based solver [15] 20
Fig 3-4 Physics of splashing, momentum, heat, and mass transfer for the Wall-Film [15] 26
Fig 3-5 Heat, mass, and momentum transfer between discrete and continuous phase [15] 27
Fig 3-6 Wall Y plus at angle of attack 0 deg 30
Fig 3-7 Lift coefficients comparison between numerical results and theory 31
Fig 3-8 Drag coefficients comparison between numerical results and theory 31
Fig 4-1 Lift coefficients for 3 different numerical results comparing to experimental data 32
Fig 4-2 Drag coefficients for 3 different numerical results comparing to experimental data 34
Fig 4-3 Lift coefficients for no rain condition at AOA 0 deg. 36
Fig 4-4 Drag coefficients for no rain condition at AOA 0 deg. 36
Fig 4-5 Lift coefficients for numerical and experimental results 37
Fig 4-6 Drag coefficients for numerical and experimental results 38
Fig 4-7 Lift degradation rate at LWC=25g/m3for numerical and experimental results 40
Fig 4-8 Lift degradation rate at LWC=39g/m3 for numerical and experimental results 40
Fig 4-9 Drag increasing rate at LWC=25g/m3 for numerical and experimental results 42
Fig 4-10 Drag increasing rate at LWC=39g/m3 for numerical and experimental results 42
Fig 4-11 L/D degradation rate at LWC=25g/m3 for numerical and experimental results 44
Fig 4-12 L/D degradation rate at LWC=39g/m3 for numerical and experimental results 45
Fig 4-13 Global view of rain distribution 46
Fig 4-14 Local view of rain droplets near airfoil 46
Fig 4-15 Local view of instance of rain droplets impacting airfoil 47
Fig 4-16 Lift coefficients convergence process at AOA 2 deg 48
Fig 4-17 Drag coefficients convergence process at AOA 2 deg 48
[1]Luers, J. K. and P. A. Haines, “Heavy Rain Influence on Airplane Accidents,” Journal of Aircraft, Vol. 20, No. 2, Feb. 1983, pp.187-191.
[2]Valentine, James, R., “Airfoil Performance in Heavy Rain,” Transportation Research Record, No. 1428, Jan. 1994, pp. 26-35.
[3]Valentine, James, R. and Rand, A. Decker, “Tracking of Raindrops in Flow over an Airfoil,” Journal of Aircraft, Vol. 32, No. 1, Jan-Feb. 1995, pp.100-105.
[4]Valentine, James, R. and Rand, A. Decker, “A Lagrangian-Eulerian Scheme for Flow Around and Airfoil in Rain,” Int. J. Multiphase Flow, Vol. 32, No. 1, 1995, pp.639-648.
[5]Wu S.W., Aerodynamic Performance Analysis under the Influence of Heavy Rain, M.S. Thesis, Tamkang University, 2003.
[6]Rhode, R. V., “Some Effects of Rainfall on Flight of Airplanes and on Instrument Indications,” NACA TN903, April 1941.
[7]Hansman, R. J., Jr., and A.P. Craig, “Low Reynolds Number Tests of NACA 64-210, NACA 0012, and Wortmann FS67-K170 Airfoils in Rain,” Journal of Aircraft, Vol. 24, No. 8, Aug 1987.
[8]Bezos, G.M. and Campbell, B.A., Development of a Large-Scale, Outdoor, Ground-Based Test Capability for Evaluating the Effect of Rain on Airfoil Lift, NASA TM-4420, April 1993.
[9]Bilanin, A.J., “Scaling Laws for Testing Airfoils under Heavy Rainfall,” Journal of Aircraft, Vol. 24, No.1, Jan. 1987, pp.31-37.
[10]Dunham, R. E., Jr., “The Potential Influence of Rain on Airfoil Performance,” Von Karman Institute for Fluid Dynamics, 1987.
[11]Markowitz, A. M., “Raindrop Size Distribution Expression,” Journal of Applied Meteorology, Vol. 15, 1976, pp.1029-1031.
[12]Thompson, B. E., J. Jang, and J. L. Dion, “Wing Performance in Moderate Rain,” Journal of Aircraft, Vol. 32, No. 5, Sept.-Oct. 1995, pp.1034-1039.
[13]Hasting, E.C., Jr. and G.S. Manuel, “Scale-Model Tests of Airfoils in Simulated Heavy Rain,” Journal of Aircraft, Vol. 22, No. 6, June 1985, pp.536-540.
[14]Haines, P.A., and J.K. Luers, “Aerodynamic Penalties of Heavy Rain on Landing Aircraft,” Journal of Aircraft, Vol. 20, No. 2, Feb. 1983, pp.111-119.
[15]Fluent’s User Guide
[16]Abbot, Iran H. and A. E. von Doenhoff, Theory of Wing Section: Including a Summary of Airfoil Data, Dover Publication, 1959.
[17]Gong, Ding-Chong, Personal Communication, 2008.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top