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DESIGN OF MINIATURE TURBOJET ENGINE 58 3.12 Bearings, Fuel Injection, and Lubrication In order to build and operate an engine, it is essential to first consider the bearing, fuel, and lubrication that will keep rotating components moving efficiently. During the first stages of our design process we determined that it would not be feasible to design and build the ball bearings or the fuel and oil pumps. Through research regarding bearings used by RC jet modelers and manufacturers of small gas turbines, we identified a set of bearings that would be capable of withstanding the extreme temperatures and rotational speeds to be experienced in our engine. The bearings we chose are specifically offered, by BOCA Bearing, for miniature jet turbines, they are stainless steel/ceramic hybrid angular contact bearings capable of withstanding RPM up to 100,000 with proper lubrication. Originally, the combustion chamber was designed specifically to accommodate liquid fuels through the use of the vaporization tubes. However, it became apparent later in the design process that we would be unable to purchase and assemble a fuel pump and throttle system within the allotted timeframe and budget. However, our engine is capable of running on multiple fuels, both liquid and gaseous. Therefore, we decided to run the engine on gaseous fuel in order to eliminate the need for a fuel pump and achieve throttling through the use of a valve. The theoretical minimal fuel consumption calculation using propane can be seen in Appendix C. In order to ensure that the bearings would not fail at high rotational speeds and temperatures during operation, we incorporated a bearing lubrication system into our design. The system consists of two 1⁄4in stainless steel tubes enteringPDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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