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4.5 Combustion chamber The chosen combustion chamber was of annular type. Compared to the other can and can-annular, the annular type is of a more solid and simple construction and has the possibility to give the most efficient combustion. It is structurally the easiest to build, and is great for a simple construction. A disadvantage of the annular combustion chamber is that replacement will require an engine disassembly, which is expensive and time consuming, for us this is not an issue. 4.6 Bearings The shaft was made out of a steel rod to create a solid structure, with the bearings connecting the shaft to the engine. The maximum allowed speed of the bearings was listed at 50,000 rpm. Another factor in how fast we could make the engine spin is balancing of all the rotating parts, which is an complicated process, requiring a lot of precision and patience. This caused some prob- lems with the compressor, as these speeds would not be sufficient to achieve compression ratios needed for a self-sustaining cycle. 4.7 Efficiency The plan was to measure temperature and pressure in various places in the engine and compare the results with a Brayton cycle, thus being able to compare the efficiency of a real jet engine. The instruments needed were thermocouples and pressure gauges that could handle high temperatures and a hall sensor to measure the speed, these were prohibitively priced and did not fit the budget. Since we aimed always at simplicity of construction we did not expect the efficiency to be very great, the flow path of the air would have lead to many losses due to turbulence. The major factors in cycle efficiency, temperature and pressure, would also have been a lot lower than what one finds in modern jet engines. 29PDF Image | Design and construction of a simple turbojet engine
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