-
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.