Theory of the Wake

  • William Frederick Durand


The validity of the airfoil theory as presented in the foregoing chapters is limited to the range of the angle of attack in which the airfoil is “unstalled”, i. e. no “separation” of the flow from the surface of the airfoil occurs. It is known that “stalling” or separation is, in general, connected with a certain decrease of the lift and with a very definite increase of the drag. We do not deal in this volume with the causes and the mechanism of the separation itself, because this problem belongs chiefly to the theory of viscous fluids. However, the motion in the “wake” produced behind a moving body in the case of separation can be approximately described by different methods using only the equations of ideal fluids. These methods are based on the assumption that although the viscous forces are in most cases essential for the separation, their influence on the flow in the wake itself can be neglected in a first approximation.


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Copyright information

© Berlin · Julius Springer 1935

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  • William Frederick Durand

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