##### QUASI-SELF-SIMILAR DESCRIPTION OF AN EXHAUST JET

A. N. Kucherov
UDC 533.6
The method of construction of an analytical solution for
the far field of an exhaust jet on the basis of the quasi-self-similar
solution of Prandtl equations and the turbulence model with one differential
equation for the coefficient of kinematic viscosity is described.
An exact numerical solution for distances to about 10^{1}
radii of the nozzle is constructed for the basic version.
Then, a numerical solution and its analytical approximation by the
quasi-self-similar solution are constructed. Approximations of the
similarity parameters of the self-similar problem as functions of
the similarity parameters of the initial problem in the form of polynomials
allow construction of analytical solutions for different situations,
which are in satisfactory agreement with the exact numerical solution
at distances of 10^{3} radii.
N. E. Zhukovskii Central Aerohydrodynamic Institute, Zhukovskii, Russia;
email: ank@aerocentr.msk.su. Translated from Inzhenerno-Fizicheskii
Zhurnal, Vol. 76, No. 1, pp. 60-64, January-February, 2003.
Original article submitted July 23, 2002.