CONTROL OF THE PERIODIC TURBULENT FLOW OVER A SEMICIRCULAR AIRFOIL WITH THE USE OF THE SLOT SUCTION OF THE AIR FROM A CIRCULAR VORTEX CELL AT SMALL ANGLES OF ATTACK

It is shown that, in the case where, into the back wall of a semicircular airfoil with an angle of attack of 5o
, a vortex
cell of diameter 0.2 in fractions of the airfoil chord is built in and the mean-mass rate of slot suction of the air
from this cell is larger than 0.15 of the incident-fl ow velocity, the pattern of the turbulent fl ow over the airfoil is
transformed, and, at an optimum suction rate of 0.75, the lift coeffi cient of the airfoil reaches a maximum value of
the order of 1.7 at an aerodynamic effi ciency of 10.
It is shown that, in the case where, into the back wall of a semicircular airfoil with an angle of attack of 5o
, a vortex
cell of diameter 0.2 in fractions of the airfoil chord is built in and the mean-mass rate of slot suction of the air
from this cell is larger than 0.15 of the incident-fl ow velocity, the pattern of the turbulent fl ow over the airfoil is
transformed, and, at an optimum suction rate of 0.75, the lift coeffi cient of the airfoil reaches a maximum value of
the order of 1.7 at an aerodynamic effi ciency of 10.
Author:  S. I. Isaev, P. A. Baranov, A. G. Sudakov and A. E. Usachev
Keywords:  control of fl ow, aerodynamic effi ciency, thick airfoil, vortex cell, slot suction, turbulence, MSST, VP2/3 package
Page:  1500