Computational study of the flowfield through a cascade of NACA 0012 airfoils

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" Computational study of the flowfield through a cascade of NACA 0012 airfoils "
M. N. Ahmed

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112844
Doc. No	:	TLpq304221435
Main Entry	:	M. N. Ahmed
Title & Author	:	Computational study of the flowfield through a cascade of NACA 0012 airfoils\ M. N. Ahmed
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1995
student score	:	1995
Degree	:	M.S.
Page No	:	118
Abstract	:	Numerical simulation of flow past airfoils is important in the aerodynamic design of aircraft wings and turbomachinery components. These lifting devices often attain optimum performance at the condition of onset of separation. Therefore separation phenomena must be included if the analysis is aimed at practical applications. Consequently, in the present study, numerical simulation of steady flow in a linear cascade of NACA 0012 airfoils is accomplished using a numerical scheme employing control volume approach. The flow field is determined by solving two dimensional incompressible Navier-Stokes equations while the effects of turbulence are accounted for by the k-usd\varepsilonusd model. Separation point at the airfoil surface is predicted at high angles of attack. Pressure, lift and drag coefficients are computed and the results are compared with the predictions of isolated single NACA 0012 airfoil. The study is extended to include the effects of stagger angle of the cascade and rotating boundaries of the isolated airfoil on the flow characteristics. It is found that increase in solidity and/or stagger angle increases the angle of attack at which separation occurs and pressure, lift and drag coefficients are highly influenced by the angle of attack and the solidity ratios. For the case of airfoil leading edge rotation a reduction in the wake size is predicted at high angle of attack. For this case an increase in the lift and a decrease in the drag coefficient is also predicted.
Subject	:	Aerospace materials
	:	Applied sciences
	:	Mechanical engineering