Analytical Evaluations of Shaft Output on Different Rotor to Casing Diameter Ratios at Optimal Value of Vane and Injection Angles for a Multi-Vane Air Turbine

Abstract

The atmospheric air is freely available but once it is compressed, it develops the potential power source for running any prime mover as a zero pollutant. Thus air turbine proposed to be installed here on motorbike transforms the energy of the compressed air into shaft work in place of an internal combustion engine. This paper details a mathematical modeling and performance evaluation of an air driven vane type rotary novel air turbine / engine. The effect of isobaric admission and adiabatic expansion of high pressure air for different rotor to casing diameter ratios at optimum vane and injection angles as 450, 300 respectively have been considered and analyzed. The optimum work output is seen at some typical values of rotor / casing diameter ratios at moderate air consumptions. In this study, the power obtained along linear expansion (without excessive air consumption) as 6.0-7.6 kW (8-10 HP) between rotor to casing diameter ratios 0.85 to 0.80, at casing diameter of 200 mm, injection pressure of 90 psi (6 bar) and speed of rotation 2500 rpm which is enough to run any motorbike or light vehicle.