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DESIGN OF MINIATURE TURBOJET ENGINE 26 there are minimal kinetic energy losses due to this friction. Well-designed nozzles can commonly achieve efficiencies up to 90%. Common nozzle designs for aircraft include the converging nozzle and the converging-diverging nozzle. Converging nozzles are used for aircraft flying at subsonic speeds, speeds which are less than the speed of sound throughout the nozzle. Converging-diverging nozzles are used to achieve supersonic flows, which are typically used in military aircraft. Flow through convergent nozzles are subsonic when the pressure at the exit is equal to ambient pressure (Hill & Peterson, 1992). The exit area of a convergent nozzle is known as the throat. This project focuses on the use of a converging nozzle in order to reduce noise and avoid shockwaves. Theoretical converging nozzle analysis uses some basic assumptions: frictional losses between the air and the walls are neglected, the gases are treated as ideal gases, the process is steady state and steady flow, the process is isentropic, and mass and energy are conserved through the nozzle (Smith, 1956). These assumptions aid in the design of nozzles, however small jet engines have been successful using a very simple converging nozzle design with minimal reduction in cross sectional area across the nozzle. This is done in order to avoid choked flow at the exit (Benini & Giacometti, 2007).PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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