ON THE AERODYNAMIC FORCES ACTING ON AN
AIRFOIL SECTION WITH A PENETRABLE REGION

D. F. Abzalilov and N. B. Il'inskii

UDC 533.6.013.11:532.5.031

Strict formulas for calculating the aerodynamic forces 
acting on a section of an airfoil with a penetrable region, through 
which a part of an external flow of an ideal incompressible fluid 
is sucked in, and on an airfoil section, from which a jet stream is 
blown out, in the case where these sections are in a steady-state 
flow without separation have been derived. Formulas for calculating 
the power expended for the realization of suction of a part of an 
external flow through an airfoil section and simultaneous blow-out 
of a jet stream from it are proposed.

A. V. Luikov Heat and Mass Transfer Institute, National 
Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, 
Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, 
No. 2, pp. 116-125, March-April, 2006. Original article submitted 
March 2, 2004; revision submitted October 14, 2004.