ON THE GAS FLOW RATE THROUGH A MACH DISK IN AN UNDEREXPANDED JET

A. S. Chizhikov

UDC 533.6.011.72

An air jet with an excess static pressure at a regime 
of escape into quiescent air is considered. The range of Mach number 
variation is 1-3, and that of the inefficiency ratio 1-1000. 
An analysis has been made on the basis of the well-known experimental-calculated 
approximation dependences for stationary expanding flows. We solve 
the inverse problem where the parameters at the nozzle exit and the 
geometric characteristics of the initial section of the jet are known 
and it is required to find the remaining quantities corresponding 
to them. In the present analysis, this is the rate of flow through 
a central discontinuity and the integral characteristic of the magnitude 
of the total pressure loss.

Keywords: stationary jet, gas flow rate, Mach disk, 
total pressure losses, heat flux. 

Joint Institute for High Temperatures, Russian Academy of 
Sciences, 13 (Bld. 2) Izhorskaya Str., Moscow, 125412, Russia. Translated 
from Inzhenerno-Fizicheskii Zhurnal, Vol. 82, No. 2, pp. 320-325, 
March-April, 2009. Original article submitted January 10, 2007.