In this study, Lift/Drag and Moment/Lift values of a wing concept with NACA 4412 airfoil under ground-effect conditions were investigated in 2D at varying altitudes. Figure A. Ground effect schematic and pressure distribution around airfoilPurpose: In this study, turbulence modeling of the wing concept designed for a hoverwing operating using ground effect has been made. At varying angles of attack and altitudes, altitude and angle of attack values were tried to be obtained where the maximum lift/drag and minimum moment/lift ratios were the most ideal.Theory and Methods: Analyzes were made using the ANSYS Fluent Academic program. It is made with a realizable k-ε turbulence model at 0 to 10 degrees of attack angles by decreasing by 0.1 chord in each step from 1 chord height to 0.1 chord height. In these analyzes, changes in lift/drag and moment/drag values were observed. Results:The values obtained after the analyzes were compared. It was observed that the maximum lift/drag ratio was obtained at an angle of attack of 4 degrees at an altitude corresponding to 0.1 chord height, and an increase of 38% compared to 1 chord height. Moment/drag, another factor that was taken into account when evaluating the analyzes, showed a remarkable decrease at 0 to 4 degrees of attack angle and changed very little after 4 angles of attack. Conclusion:It was observed that the NACA 4412 airfoil with a length of 2.75 m, which was analyzed, reached the values that it would be both the most efficient and balanced at 4 angles of attack under ground-effect conditions, but wind tunnel experiments were not carried out due to time and financial constraints. In order to make a definite judgment about the analysis results, wind tunnel experiments should definitely be done as a future study.
ÖzHava yastıklı taşıtlar hem kara hem de su operasyonlarında kullanılmaya müsait amfibi taşıtlardır. Bu taşıtlar çoğu hava aracı gibi havalanabilmek için kanatlara ihtiyaç duyarken, aynı zamanda gövdesinin alt kısmından basınçlı havayı koşullandırarak yukarı yönde kuvvet oluşturur. Yönlendirilmiş hava ve aracın ağırlığı sebebiyle gövde altında basınçlı bir hava bölgesi oluşur (Air cushion). Böylece hoverwing kum, çakıl, çamur ve su üstünde uçak gibi uçarken aynı zamanda da bot gibi suda yüzdürülebilir. Bu çalışmada üretilmesine karar verilen bir howerwing taşıtın gövdesine eklenecek olan kaldırma sistem tasarımı ele alınmıştır. Bu süreç esnasında hull Solidworks'de çizilmiş, Ansys Fluent'te akış analizleri yapılmıştır. Bu analizler doğrultusunda optimum inlet açısının "realizable k-e" türbülans modellemesi kullanılarak 22 0 olduğu saptanmıştır. Böylece gövde çıkışlarından etek girişlerine laminer ve yeterli basınçta hava dağıtımı yapılırken bu havayı sağlayacak inlet, aracın genel tasarımına uygun bir şekilde tasarlanmıştır.
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