Influence of surface roughness on the heat transfer coefficient of fluids in an additively manufactured supercharger

The supercharger is intended for heating a fluid (gaseous helium or gaseous nitrogen) used the pressurization of fuel tanks oxidizer and propellant rocket engine. heated with generator gas downstream turbine. A increased channel surface roughness was made according to an additive technology. High one features producing parts by selective laser melting. article presents method calculating heat transfer nitrogen, as well results both without account in channels liquid-propellant engines additively manufactured supercharger. Firing tests were carried out at research base NPO Energomash JSC. calculated experimental values temperature working medium outlet are compared.