INFLUENCE OF DISTRIBUTED BLOWING-IN ON A TURBULENT BOUNDARY LAYER ON A BODY OF REVOLUTION

A computational-experimental analysis of the eff ectiveness of stationary distribution of air blowing-in through a perforated surface on the properties of a turbulent boundary layer being formed on an elongated axisymmetric body of revolution under the conditions of incompressible fl ow past it at the Reynolds number ReL = 4.39·106 has been made. The blowing-in coeffi cient Cb varied over the range 0–0.01397. The Reynolds number Re** based on the momentum thickness δ** upstream of the perforated section was equal to 5603. It is shown that with increase in the longitudinal coordinate up to a distance of 600 δ** from the region of blowing-in, a steady decrease in the local friction is observed whose maximum value attains 100% directly in the region of blowing at a maximum intensity of the latter. Under the indicated conditions, the total aerodynamic drag of the body of revolution can be reduced by no less than 8.7%.
   
Author:  V. I. Kornilov, E. A. Shkvar, and A. N. Popkov
Keywords:  turbulent boundary layer, body of revolution, blowing-in, perforated surface, friction
Page:  132