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