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DESIGN OF MINIATURE TURBOJET ENGINE 9 1.0 Introduction The gas turbine engine is a machine that, according to the thermodynamic Brayton Cycle, does work by harnessing energy from a working fluid and converting the energy into a useable form. Various types of gas turbines are designed to perform a range of tasks but all operate on similar principles. Air enters the engine, is compressed, mixed with fuel, combusted, and then expanded through a rotating turbine. Common applications of modern gas turbines include: producing auxiliary power for ground or aircraft systems, propelling military aircraft at supersonic speeds, and driving the rotor system of helicopters (Macisaac & Langton, 2011). Due to the extreme temperatures and high rotational speeds experienced by engine components, design and construction of a gas turbine demands accuracy, informed material selection, knowledge of thermodynamics, and the ability to model and machine metal components. As material processing techniques advanced, it became possible to manufacture gas turbine engines small enough to power radio controlled (RC) airplanes. Modern gas turbines for full size aircraft generally utilize axial compressors and turbines with multiple stages of blades. These multi-stage components increase efficiency, pressure ratios, and performance characteristics (Shreckling, 1992). However, RC jet modelers found that small engines can be reasonably efficient and powerful with single stage compressor and turbine stages. A centrifugal compressor matched to an axial turbine has become a common design among RC jet enthusiasts. With this simplification, along with advancements in CNC machining and 3D modeling, it is possible to manufacture a complete miniature gas turbine with a relatively small investment.PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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