Aerodynamics: Fundamentals of Theory, Aerodynamics of an by N.F. Krasnov

By N.F. Krasnov

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Extra info for Aerodynamics: Fundamentals of Theory, Aerodynamics of an Airfoil and Wing; Methods of Aerodynamic Calculation

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Theory. Aerodynamics of an Airfoil and a Wing of the intramolecular forces.

We want to determine the resultant values of the aerodynamic forces and moments. The isolated surface element dS of the body experiences a normal force produced by the excess pressure (p - p 00) dS and the tangential * We shall omit the word "components" below for brevity, but shall mean it and use formulas for scalar quantities. 42 Pt. I. Theory. Aerodynamics of an Airfoil and a Wing Fig. t Action of pressure and friction '(shear) forces on an elementary . area SIJ force 1: dS. The sum of the projeetions of these forces onto the x-axis ,of a wind (flight path) coordinate system is (Fig.

It differs in that it is plotted in a body axis coordinate system along whose axis of abscissas the values of the longitudinal-force coefficient C x are laid off, and along the axis of ordinates-the normal-force coefficients cY (Fig. 4). This curve is used, particularly, in the strength analysis of craft. Theoretical and experimental investigations show that in the most general case, the aerodynamic coefficients depend for a given body confIguration and angle of attack on dimensionless variables such as the Mach number Moo = V oofa oo and the Reynolds number Re = V ooLp oo/ftoo.

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