Development of mathematical model of gas flow for calibration stand of full and static pressure receivers

Abstract

The paper proposes a mathematical model for calculating
the main parameters of a controlled gas flow in the
process of designing and creating a calibration stand for
static and total pressure receivers, which allows, before the
stand certification, to identify the features and pattern of
the distribution of these parameters along the radius and
length of the gas flow jet. Obtaining a given controlled
gas flow, in turn, is associated with the calculation and
manufacture of the nozzle. The paper proposes the use of
a subsonic nozzle calculated according to the Vitoshinsky
formula, which allows creating a given gas flow rate in the
working part of the calibration stand depending on the
gas flow rate (three modes are considered). The results
of calculation of such gas flow parameters as longitudinal
velocity, static pressure and static temperature at different
distances from the nozzle exit (at the nozzle exit, at a
distance of 2Ra, at a distance of 5Ra) are presented.