Parametric investigations of flows in micronozzles

The work is devoted to parametric investigations of the krypton flow in a conical micronozzle when flowing into region with low pressure. features flows are studied at various values stagnation pressure pre-nozzle volume, including occurrence condensed phase flow. Mathematical modeling was carried out on basis numerical solution complete system Navier-Stokes equations, supplemented by equation for mass fraction condensate. mathematical model takes account change coefficients dynamic viscosity and thermal conductivity depending gas temperature. problem solved control volume method block-structured regular grid quadrangular elements using schemes second order accuracy. equations were integrated respect time Runge-Kutta method. calculations pressures 5, 10, 15 atm single-phase two-phase flows. distribution fields temperature Mach number nozzle space behind it presented. axial pressure, temperature, has been studied. It shown that case flow, self-similarity observed. similar, but dimensionless form they coincided each other. In this case, identity velocity observed different violated zone formation particles. dimensions zones local increase, as well intensity heat release, depend given which reflected characteristics