Airfoil Design and Data by Prof. Dr. Richard Eppler (auth.)

By Prof. Dr. Richard Eppler (auth.)

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099 1. 062 1. 062 1. 030 1. 993 1. 035 1. 084 33 if the velocity distributions are plotted, the printed values are not of much interest. Such plots can be initiated by a DIAG-line. 15). What can be done in order to obtain a reasonable airfoil? There are two ways. The first possibility is to specify less pressure recovery, for example, higher wand w in the TRA2 line. The correct value will not be found in the first try but it is possible to find a "good" value in a few attempts. 6, is solved. In the present example, the goal is Ks = O.

It is positive if the shear stress t increases in the y-direction. In Fig. 1, a volume is sketched, the extent of which in the y-direction is dy. At the upper surface (y+dy), the force to the right is produced by a positive shear stress t; at the lower surface, a positive t to the left. If t increases in the y-direction, which means dt/dy > 0, produces a force a force in the positive x-direction results from the shear stress. The opposite is true if t decreases with y. Fig. 1 For y ~ (X) (or y~ 8 ) , Pressure and viscous forces on a fluid element the y-deriva tives of u tend toward zero and u~ U.

It can be considered as the nondimensional inertial force. On the pressure term is quite clear. It contributes to a negative acceleration if ap/ax right > o. side. the A volume. 52 having a length in the x-direction of dx has then a higher pressure· at x+dx than at x and undergoes a resulting pressure force in the negative x-direction, see Fig. 1. The opposite is true for dp/dx < O. The second term on the right represents the nondimensional viscous force. It is positive if the shear stress t increases in the y-direction.

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