The use of compressed air as a potential zero pollution power source for motorbikes is new challenge. The motorbike is proposed to be installed with an air turbine transforms the energy of the compressed air into shaft work in place of an internal combustion engine. The paper describes a mathematical modeling and performance evaluation of a small capacity compressed air driven vaned type novel air turbine. 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 45o, 60o respectively have been considered and analyzed. It is concluded that the work output is found optimum for some typical values of rotor / casing diameter ratios. In this study, the maximum power obtained for linear expansion as 3.977 kW (5.50 HP) when casing diameter is 100 mm and rotor to casing diameter ratio are 0.75 to 0.70 at 90 psi (6 bar) and speed of rotation 2500 rpm which is sufficient to run motorbike.
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