Abstract
This paper presents quasi one-dimensional numerical analysis of the interaction of particles with the carrying gas flow for high velocity oxy-fuel (HVOF) thermal spraying nozzle. The method includes gas dynamical calculations of the gas flow in a HVOF nozzle taking into account of flow friction at wall and calculations of injected particle motion and temperature. The calculations were performed for particles of tungsten carbide with diameter of 30mm and 50mm. The design Mach number of the nozzle is set as 2.0. The working gas is assumed to be perfect gas for simplicity. The gas temperature at the chamber is set as 3000K. Thermal choking takes place due to wall friction at 16.4 times the nozzle exit diameter downstream from the entrance of the nozzle throat. The velocity and temperature of working gas and particles are calculated through the HVOF nozzel.
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