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Design and Manufacturing of a Miniature Turbojet Engine

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Design and Manufacturing of a Miniature Turbojet Engine ( design-and-manufacturing-miniature-turbojet-engine )

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DESIGN OF MINIATURE TURBOJET ENGINE 18 2.2.B. Diffuser The purpose of a diffuser is to decelerate the speed of the incoming compressed fluid, converting the speed of the gas into pressure. Essentially, the diffuser converts high speed air in the form of kinetic energy into potential energy in the form of high pressure. There are a variety of acceptable diffuser designs for small gas turbines. One design, the radial wedged diffuser, has become popular among manufacturers of small gas turbines for model aircraft. The KJ66, a primitive engine design widely popular among RC jet enthusiasts, utilizes the radial wedged diffuser design (Ling, Wong, & Armfield, 2007). The blade configuration of these diffusers can vary greatly and still perform adequately, some are curved in the direction of rotation of the impeller while others curve in the opposite direction. However, perhaps the most desirable blade design characteristic for small gas turbines is that the blade widens to provide sufficient surface area for bolt holes (Kamps, 2005). These bolt holes provide a convenient location that allows the manufacturer to bolt the diffuser, compressor and inlet shroud into a ridged body. 2.2.C. Turbine & Stator Turbines, like compressors, are designed as either axial or radial. Axial-flow turbines are the most widely used because they offer the possibility for higher mass flow rates than that of radial turbines. Typically, axial-flow turbines consist of multiple stages in order to increase efficiency and thrust production. However, when designing small gas turbines single stage axial turbines are often used. The turbine stage usually consists of nozzle stationary guide vanes, also known as a stator. Stator blades are airfoils with their

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