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Essay / Gas turbine engines: tuboprop and turbofan engines
Task 1 (P4)1. Select two main types of gas turbine engines and state their advantages and disadvantages with respect to their operation, construction and installation arrangement. Gas turbine engines are divided into four different types, the turbojet, the turbofan, the turboprop and the turboshaft. Turbofans and turboprops will only be the subject of a detailed study. Turboprop Engine The turboprop engine is almost the same as the turbojet engine since it is also equipped with a fan on the front part of the engine, which is the propeller used as the source of force for the engine powered by the turbine. But the turboprop is equipped with an additional gearbox that reduces the speed of the exhaust gases. The turboprop engine is only capable of flying in limited altitude and speed ranges, which is why it needs a reduction gear assembly. The turboprop engine has a typical assembly, as others which include the main components of gas turbine engines differ only in the gearbox and torque meter assembly. The propeller of this engine can be driven by a fixed or free turbine. The fixed turbine is connected directly to the other components, compressors, gearbox and propeller shaft while on the free turbine, it is not connected to the compressor but only to the propeller shaft and the gearbox. Turboprop operation applies gas turbine operation with the use of a propeller, except that the exhaust gases are not discharged onto the nozzle for thrust but are used to power and drive the turbine. The advantages of the turboprop are as follows: It has the highest energy efficiency compared to turbojets and turbofans. It can operate on short runways unlike turbojets. Its propeller is made with inverted configuration... ... middle of paper ......l http://www.skybrary.aero/index.php/AP4ATCO_-_Turboprop_Engine http://akshaynagarmat.hubpages.com/hub/Turbo-Jet-EnginesImagesType Comparison - http://www.daviddarling.info/images/turbojet_and_turboprop_engines.jpgTurboprop - http://www.allstar.fiu.edu/aero/images/ pic6-9.gifTurbojet - http://www.infovisual.info/05/ img_en/090%20Turbo-jet%20engine.jpgTurbine Powerplant Library BookAPU - http://lurnq.com/lesson/APU-The-Hidden-Engine -Airplane/Ground Sources - http://4.bp.blogspot. com/-dh7Lmas37-A/TfIA5jz5vBI/AAAAAAAAAEHs/671pTkAdO6Q/s1600/Screen%2Bshot%2B2011-06-10%2Bat%2B7.31.56 %2BAM%2B%2528601%2Bx%2B339%2529.pngTask 2 - Book on central gas turbine electrics for aircraft; Image -http://www.thaitechnics.com/engine/tg7/inlet.jpgTask 3 - http://www.scribd.com/doc/3490980/Gas-Turbine-Turbojet-Turbofan-Rolls-Royce-The-Jet -Engine; Aircraft Gas Turbine Power Plants Book