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Preliminary design of micro scale turbojet

Czarnecki M., Orkisz M.

Journal of KONES

2008

Vol. 15, No. 3

83-87

During the development of the small gas turbine, the most important calculations comes from preliminary design process which gives a shape of airflow duct and limits available space for each component of the engine. Micro scale jet engines are not simply reduced-scale model of the full-size engines. The basic method of working is the same, but the are special considerations which demands a different approach to the main design. There are few similarities to the first generation of turbojets, for both critical dimensions comes from compressor and combustor. Micro gas turbine in the contrast to jet engines does not possess the mechanical coupling to the group of accessories. All accessories are electric driven. Small fuel pumps supply fuel line with pressure that hardly exceeds pressure that comes from compressor. The lubrication system is connected to the main fuel line. Bearings are lubricated with mixture of kerosene and turbine oil. Main difficulties in the process of preliminary design come from connecting of the each engine component. Narrow margin that consist limitations from rotational speed, overall dimensions, thermal and centrifugal loads ,overall efficiency and lack of knowledge about design process for small gasturbine makes up challenge for skilled designers.