Tech@Edu

TURBOFAN ENGINE The turbofan engine is a combination of the turbo prop and the turbojet engines combining the advantages of both. The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to accelerate air rearwards. Thus, whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of that air bypasses these components.  In the 1950s, Rolls-Royce introduced the first turbofan in the world, namely, RB.80 Conway. Classification 1. According to Fan Location (a) Forward Fan Turbofan Engine (b) AFT Fan Turbofan Engine 2. According to Spools (a) Single Spool Turbofan Engine (b) Double Spool Turbofan Engine (c) Triple Spool Turb

TURBO-PROP ENGINE (OR) TURBO-PROPELLER ENGINE A turboprop engine is a turbine engine that drives an aircraft propeller. It is very similar to turbojet engine. In this type, the turbine drives the compressor and propeller.  The world's first turboprop was designed by the Hungarian mechanical engineer Gyorgy Jendrassik. Jendrassik published a turboprop idea in 1928, and on 12 March 1929 he patented his invention. Classification of Turboprop Engine 1. According to Spool (a) Single Spool Turboprop Engine (b) Double Spool Turboprop Engine (c) Triple Spool Turboprop Engine 2. According to installation (a) Pusher type Turboprop Engine (b) Tractor or Puller type Turboprop Engine Construction It consists of: (1) Diffuser (2) Compressor (3) Combustion chamber (4) Exhaust nozzle (5) Reduction gear and (6) Propeller Working Air from the atmosphere enters into turbo prop engine. The air velocity gets reduced and its static pressure is increased by diffuser. Then the air passes through the rotar