Stability of Turbine Blades, Aircraft Wings and Their Acoustic Radiation

Hamadiche, Mahmoud

doi:10.18186/jte.01319

Cited by 1 publication

(1 citation statement)

References 27 publications

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“…A detailed analysis of blades for the flight vehicles is more crucial since the aerodynamic performance will be affected because of the presence of an unsteady loading such as different wind conditions [19]. These unsteady loads causing the instability over the airfoils can be suppressed or mitigated thanks to material of airfoil [20][21][22] or active-passive flow control techniques [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Thickness and Camber Ratio on Flow Characteristics Over Airfoils

Karasu

Açıkel

Koca

et al. 2020

Journal of Thermal Engineering

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This study ensures experimental and numerical investigation of different airfoils to observe and understand how camber ratio affects the flow characteristics over surface of different airfoils. Experimental results in the previous studies were used while the numerical study was performed for present investigation. Reynolds numbers based on the airfoil chords were 1x10 5 and the angle of attack of 8°. Instantaneous voltage output data were used in order to detect transition location for NACA 4412, oil surface visualization experiments were presented for NACA 2415. In the numerical analysis, values of u/U∞ and turbulent kinetic energy were presented for NACA 4415 airfoil. The experimental results denoted that the change of camber ratio and thickness significantly affected the flow phenomenon such as boundary layer separation or formation and progress of the laminar separation bubble. The long bubble was clearly observed with accumulation of pigments at oil-flow measurement experiment. By increasing the camber ratio with the use of NACA 4412 airfoil, the long bubble turned into the short bubble. Briefly, not only the progress and formation of laminar separation bubble was being affected, but also the onset of transition point was obviously influenced by changing of camber ratio.

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