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  • Essay / Turbojet Engine Test - 1592

    TURBOFAN ENGINE TEAM NAME: MUST ADVENTURERS.NAMES OF MEMBERS: 1) AMMARA TOFIQUE.2) M.JAWAD MUZAFFAR.UNIVERSITY: MIRPUR UNIVERSITY OF SCIENCE AND TECHNOLOGY (MUST ), MIRPUR, AZADKASHMIR.CITY: MIRPUR, AZAD KASHMIR.STATE: AZAD KASHMIR.DEPARTMENT: MECHANICAL ENGINEERING.ROLL NUMBERS: 1) 11-ME-12.2) 12-ME-45.1) Definition of a turbojet engine: Turbofan is the combination of two words. “Turbo” means a gas turbine engine which takes mechanical energy from combustion and “Fan” means a fan is used and consumes mechanical energy from the gas turbine to accelerate the air backwards. 2) History of turbofan engines: 1) The first turbofan engine was tested on April 1, 1943. by Daimler Benz. 2) In the 1960s, low bypass ratio turbofans were introduced.3 ) Then further modifications were made by introducing improved materials and twin compressors.3) Construction of a turbofan engine: Fig.1 A turbofan engine It consists of: 1 )Intake duct /air inlet: it is responsible for suction of air.2) Compressor: it can be axial or centrifugal.1) Axial compressors: compressors in which the gas or working fluid flows parallel to the axis of rotation. Fig, 2 An axial flow compressor2) Centrifugal compressors: those compressors in which compression is obtained by centrifugal force. They use rotating vanes or a pulse...... middle of paper...... the fictitious pulse (in seconds) is taken along the y axis. It shows the efficiency as a function of speed of different types of jets. It concludes that the efficiency per unit distance (per km/mile) is independent of the speed of jet engines as a group. 10)Advantages of turbofan engine: The turbofan engine is more fuel efficient. It is quieter due to greater mass flow and lower total exhaust speed.11) Disadvantages of turbofan engine: The turbofan motor gives rise to greater complexity due to additional ductwork, e.g. addition of multiple shafts, heavy blades. Maximum speed is limited due to the risk of shock waves damaging the motor.  They are more prone to foreign object damage (FOD), i.e. damage to aircraft when nuts, bolts, etc. are damaged. are misplaced during jet blast, engine intake and ice damage.12)References: www.scribd.com. www.grc.nasa.gov. Engines.fighter-planes.com.