Abstract
Suspension high velocity oxy-fuel thermal spray typically utilizes axial injections of suspension into the combustion chamber. There are certain cases where the oxygen-sensitive nanoparticles benefit from a reduction in the time and temperature spent in the gas flow. Therefore, a radial injection outside of the nozzle can enable deposition of oxygen-sensitive nanomaterials. This study investigated the effect of the suspension flow rate, angle of injection and the injector diameter on the in-flight particle conditions. The combustion reaction is modeled using the eddy dissipation concept model with a robust reaction mechanism and compared to the current approach within the literature. This approach has not been employed within SHVOF thermal spray and provides a robust treatment of the reaction mechanisms. The suspension was modeled using a two-way coupled discrete particle model. Experimental observations were obtained using high-speed imaging, and observations of the liquid jet were compared to the numerical values.
Highlights
Keywords combustion modeling Á high-speed imaging Á HVSFS Á radial injection Á SHVOF Á supersonic crossflow Á suspension thermal sprayList of Symbols Cs Time scale constant = 0.4082 Cn Volume fraction constant = 2.1377 rAB Error introduced from the removal of species B onto Species ASurface engineering is a field of study that looks to alter the properties of substrate surface to increase its lifespan and durability and to reduce the surface degradation
This study aims to develop a numerical model for a radial injection in SHVOF thermal spray
This study employs the use of detailed reaction mechanisms along with the eddy dissipation concept model (EDC) combustion model and investigates the effect of the combustion model on the adiabatic flame temperature within the combustion chamber
Summary
Keywords combustion modeling Á high-speed imaging Á HVSFS Á radial injection Á SHVOF Á supersonic crossflow Á suspension thermal spray. One common approach in surface engineering is coating the surface of a substrate with a protective layer. The field of thermal spray arose to allow for the deposition of materials onto the surface of substrates to produce a protective coating. High velocity oxy-fuel (HVOF) thermal spray was developed in the 1980s to allow for the deposition of dense coatings to coat surfaces of a substrate in a protective coating. Suspension HVOF is a subset of HVOF thermal spray that allows for the deposition of nanoparticles using a suspension feedstock. In SHVOF thermal spray, premixed fuel and oxygen are injected into a
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