Basic Design Principles of Turbofan Engine P M V Subbarao Professor Mechanical Engineering Department An Evolution of Turbojet for Better Characteristics???

Energy Flow in Jet Engine Energy input Long distance travel demands high flight velocity. A Single hot Jet was creating huge noise. Also blackmailing the jet engine !!! High flight velocity leads to drop in compactness and fuel economy.

An Evolved design of Turbojet Inlet 2 3 cj 7 or hj 4 1 5 6 Total thrust may be Shared by both cold and hot jets.. In 1939-1941 Soviet designer Arkhip Lyulka elaborated the design of turbojet and created an evolved turbojet. Created the world's first turbofan engine, and acquired a patent for this new invention on April 22, 1941.

Special Design Variable for an Ideal Turbofan Engine Inlet 2 1

Sizing of Fan Inlet 2 3 1 Design Parameter : Fan Total Pressure ratio

Design Parameter : Compressor total pressure ratio Sizing of Compressor Inlet 4 2 3 1 Design Parameter : Compressor total pressure ratio

Sizing of Combustor 5 Inlet 4 2 3 1

Combined Gas Dynamic & Thermodynamic SSSF model for Turbine 5 Inlet 4 2 3 6 1