Öz
In this study, aerodynamic capabilities of NACA 0018 airfoil is numerically investigated by installing riblet on the suction side of airfoil. Numerical results were obtained by ANSYS Fluent using k-kl-kw transition model at Reynolds number of Re=100 000. Three different riblet airfoil configuration was performed at six different angles of attack (α=8°, 10°, 13°, 15°, 17° and 19°) and these results compared with the clean model. For M1 model the riblet was located at chord wise section of x/c=0.3 while it installed at x/c=0.7 for M2 model. For M3 model two riblets were used and they were located at both x/c=0.3 and x/c=0.7. Obtained numerical result show that the use of riblet remarkably affects the flow characteristics of airfoil. At α=8° the CL/CD value of M1 model is increased by 4.5% when compared to clean model. It is indicated that angle of attack at α=10o, lift coefficient is increased for all models with compared to clean model. Stall angle is delayed from α=13° to α=15° at M1 and M3 with compared to clean model and lift coefficient is increased about 37% because of the restriction of the laminar separation bubble and trailing edge separation.
Anahtar Kelimeler
Low Reynolds Number NACA 0018 airfoil Riblet Passive flow control
Kaynakça
- Beyhaghi S, Amano RS, 2018. A parametric study on leading-edge slots used on wind turbine airfoils at various angles of attack, Journal of Wind Engineering and Industrial Aerodynamics 175, 43-52.
- Caram JM, Ahmed A, 1992. Development of the wake of an airfoil with riblets. AIAA journal, 30(12), 2817-2818.
- Chamorro LP, Arndt REA, Sotiropoulos F, 2013. Drag reduction of large wind turbine blades through riblets: evaluation of riblet geometry and application strategies, Renewable Energy (50).
- Demir H, Genç MS, 2017. An experimental investigation of laminar separation bubble formation on flexible membrane wing. European Journal of Mechanics / B Fluids, 65, 326-338.
- Fatehi M, Ahmadabadi MN, Nematollahi O, Minaiean A, Kim KC, 2019. Aerodynamic performance improvement of wind turbine blade by cavity shape optimization, Renewable Energy, 132, 773-785.
- Genç MS, Karasu I, Açıkel HH, 2012. An experimental study on aerodynamic of NACA2415 aerofoil at low Re numbers, Experimental Thermal and Fluid Science, 39, 252-264.
- Genç MS, Karasu I, Açıkel HH, Akpolat MT, 2012. Low Reynolds Number Aerodynamics and Transition, InTechOpen.
- Han M, Lim HC, Jang YG, Lee SS, Lee SJ, 2003. Fabrication of a micro-riblet film and drag reduction effects on curved objects, TRANSDUCERS ’03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems, Boston.
- Istvan MS, Kurelek JW, Yarusevych S, 2017. Turbulence intensity effects on laminar separation bubbles formed over an airfoil, AIAA Journal 56.4 (2018): 1335-1347.
- Janmian L, Feng G, Can H, 2013. Numerical study of separation on the trailing edge of a symmetrical airfoil at a low Reynolds number, Chinese Journal of Aeronautics, 26(4), 918-925.
- Koca K, Genç MS, Açıkel HH, 2016. Experimental Investigation of Surface Roughness Effect over Wind Turbine Airfoil, 1th International Mediterranean Science and Engineering Congress, Adana.
- Lee SJ, Jang YG, 2005. Control of flow around a NACA 0012 airfoil with a micro-riblet film, Journal of fluids and structures 20(5), 659-672.
- Ricci R, Montelpare S, 2005. A quantitative IR thermographic method to study the laminar separation bubble phenomenon. International Journal of Thermal Sciences, 44, 709-719.
- Rinoie K, Okuno M, Sunada Y, 2009. Airfoil stall suppression by use of a bubble burst control plate. AIAA Journal 47(2), 322-330.
- Sareen A, Deters RW, Henry SP, Selig MS, 2011. Drag reduction using riblet film applied to airfoils for wind turbines, 49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Orlando.
- Sefiddashti MN, Ahmadabadi MN, Rizi BS, 2018. Experimental study of effects of circular-cross-section riblets on the aerodynamic performance of Risø airfoil at transient flow regime. Journal of Mechanical Science and Technology 32(2), 709-716.
- Seshagiri A, Cooper E, Traub LW, 2009. Effects of vortex generators on an airfoil at low Reynolds numbers, Journal of Aircraft 46(1), 116-122.
- Sundaram S, Viswanath PR, Rudrakumar S, 1996. Viscous drag reduction using riblets on NACA 0012 airfoil to moderate incidence. AIAA Journal, 34(4), 676-682.
- Walters DK, Leylek JH, 2004. A new model for boundary layer transition using a single-point RANS approach. J. Turbomach., 126(1), 193-202.
- Yarusevych S, Sullivan PE, Kawall JG, 2009. On vortex shedding from an airfoil in low-Reynolds-number flows, Journal of Fluid Mechanics, 632, pp.245-271.
- Zhang W, Hain R, Kähler CJ, 2008. Scanning PIV investigation of the laminar separation bubble on a SD7003 airfoil, Experiments in Fluids, 45, 725-743.
Öz
In this study, aerodynamic capabilities of NACA 0018 airfoil is numerically investigated by installing riblet on the suction side of airfoil. Numerical results were obtained by ANSYS Fluent using k-kl-kw transition model at Reynolds number of Re=100 000. Three different riblet airfoil configuration was performed at six different angles of attack (α=8°, 10°, 13°, 15°, 17° and 19°) and these results compared with the clean model. For M1 model the riblet was located at chord wise section of x/c=0.3 while it installed at x/c=0.7 for M2 model. For M3 model two riblets were used and they were located at both x/c=0.3 and x/c=0.7. Obtained numerical result show that the use of riblet remarkably affects the flow characteristics of airfoil. At α=8° the CL/CD value of M1 model is increased by 4.5% when compared to clean model. It is indicated that angle of attack at α=10o, lift coefficient is increased for all models with compared to clean model. Stall angle is delayed from α=13° to α=15° at M1 and M3 with compared to clean model and lift coefficient is increased about 37% because of the restriction of the laminar separation bubble and trailing edge separation.
Anahtar Kelimeler
Low Reynolds Number NACA 0018 Airfoil Riblet Passive Flow Control
Kaynakça
- Beyhaghi S, Amano RS, 2018. A parametric study on leading-edge slots used on wind turbine airfoils at various angles of attack, Journal of Wind Engineering and Industrial Aerodynamics 175, 43-52.
- Caram JM, Ahmed A, 1992. Development of the wake of an airfoil with riblets. AIAA journal, 30(12), 2817-2818.
- Chamorro LP, Arndt REA, Sotiropoulos F, 2013. Drag reduction of large wind turbine blades through riblets: evaluation of riblet geometry and application strategies, Renewable Energy (50).
- Demir H, Genç MS, 2017. An experimental investigation of laminar separation bubble formation on flexible membrane wing. European Journal of Mechanics / B Fluids, 65, 326-338.
- Fatehi M, Ahmadabadi MN, Nematollahi O, Minaiean A, Kim KC, 2019. Aerodynamic performance improvement of wind turbine blade by cavity shape optimization, Renewable Energy, 132, 773-785.
- Genç MS, Karasu I, Açıkel HH, 2012. An experimental study on aerodynamic of NACA2415 aerofoil at low Re numbers, Experimental Thermal and Fluid Science, 39, 252-264.
- Genç MS, Karasu I, Açıkel HH, Akpolat MT, 2012. Low Reynolds Number Aerodynamics and Transition, InTechOpen.
- Han M, Lim HC, Jang YG, Lee SS, Lee SJ, 2003. Fabrication of a micro-riblet film and drag reduction effects on curved objects, TRANSDUCERS ’03. 12th International Conference on Solid-State Sensors, Actuators and Microsystems, Boston.
- Istvan MS, Kurelek JW, Yarusevych S, 2017. Turbulence intensity effects on laminar separation bubbles formed over an airfoil, AIAA Journal 56.4 (2018): 1335-1347.
- Janmian L, Feng G, Can H, 2013. Numerical study of separation on the trailing edge of a symmetrical airfoil at a low Reynolds number, Chinese Journal of Aeronautics, 26(4), 918-925.
- Koca K, Genç MS, Açıkel HH, 2016. Experimental Investigation of Surface Roughness Effect over Wind Turbine Airfoil, 1th International Mediterranean Science and Engineering Congress, Adana.
- Lee SJ, Jang YG, 2005. Control of flow around a NACA 0012 airfoil with a micro-riblet film, Journal of fluids and structures 20(5), 659-672.
- Ricci R, Montelpare S, 2005. A quantitative IR thermographic method to study the laminar separation bubble phenomenon. International Journal of Thermal Sciences, 44, 709-719.
- Rinoie K, Okuno M, Sunada Y, 2009. Airfoil stall suppression by use of a bubble burst control plate. AIAA Journal 47(2), 322-330.
- Sareen A, Deters RW, Henry SP, Selig MS, 2011. Drag reduction using riblet film applied to airfoils for wind turbines, 49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Orlando.
- Sefiddashti MN, Ahmadabadi MN, Rizi BS, 2018. Experimental study of effects of circular-cross-section riblets on the aerodynamic performance of Risø airfoil at transient flow regime. Journal of Mechanical Science and Technology 32(2), 709-716.
- Seshagiri A, Cooper E, Traub LW, 2009. Effects of vortex generators on an airfoil at low Reynolds numbers, Journal of Aircraft 46(1), 116-122.
- Sundaram S, Viswanath PR, Rudrakumar S, 1996. Viscous drag reduction using riblets on NACA 0012 airfoil to moderate incidence. AIAA Journal, 34(4), 676-682.
- Walters DK, Leylek JH, 2004. A new model for boundary layer transition using a single-point RANS approach. J. Turbomach., 126(1), 193-202.
- Yarusevych S, Sullivan PE, Kawall JG, 2009. On vortex shedding from an airfoil in low-Reynolds-number flows, Journal of Fluid Mechanics, 632, pp.245-271.
- Zhang W, Hain R, Kähler CJ, 2008. Scanning PIV investigation of the laminar separation bubble on a SD7003 airfoil, Experiments in Fluids, 45, 725-743.
Ayrıntılar
| Birincil Dil | İngilizce |
|---|---|
| Konular | Makine Mühendisliği |
| Bölüm | Makina Mühendisliği / Mechanical Engineering |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Eylül 2021 |
| Gönderilme Tarihi | 16 Mart 2021 |
| Kabul Tarihi | 31 Mayıs 2021 |
| Yayımlandığı Sayı | Yıl 2021 Cilt: 11 Sayı: 3 |