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DESIGN OF MINIATURE TURBOJET ENGINE 13 thrust is created, assuming constant efficiency. One method for increasing the amount of thrust is by afterburning, also known as thrust augmentation. This design incorporates a separate burner that combusts extra fuel and releases hot exhaust gases downstream from the turbine (Britannica, 2018). Afterburners can substantially increase thrust at the expense of rapid fuel consumption. However, afterburners are primarily used in military aircraft to achieve supersonic flight. Some gas turbines do not generate thrust and instead have become a popular method for power generation due to increases in efficiencies (Boyce, Meherwan P., et al., 2012). Although these industrial applications for gas turbines exist, this paper focuses on aircraft propulsion applications. Four main types of turbines utilized in the aerospace industry are the turbojet, turbofan, turboprop and turboshaft. Turbojet and turbofan engines provide thrust generated from reaction forces created by high velocity exhaust gas leaving the outlet nozzle. The turbofan is the most common type of engine used in the aerospace industry (Hunecke, 1997). It utilizes a fan that is upstream the compressor, which is also driven by the turbine. Air bypasses the compressor and rejoins the flow downstream of the turbine adding “cold thrust.” This design achieves better fuel efficiency than turbojet engines while operating at cruising speeds common to civil airline travel. The turbojet engine, unlike the turbofan, does not allow air to bypass the compressor, it is simple by design and the earliest type of turbine propulsion engine. Turboprop and turboshaft engines use exhaust gases to drive a separate turbine that drives a propeller. The difference between the two is that the turboshaft utilizes all exhaust gas to drive the propeller, whereas the turboprop also uses some of this exhaustPDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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