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DESIGN OF MINIATURE TURBOJET ENGINE 53 Minimizing gap losses and ensuring a tightly sealed engine is crucial to the efficiency of gas turbines. In addition to the turbine, the seal between the outer casing and the flange is an area of concern for gap losses in our engine. Because the flange is bolted to the housing, it is necessary to implement a gasket between the two parts in order to eliminate any leaks. We initially decided to use gasket paper between the two parts but once the engine was assembled we found that the gasket paper did not provide a reliable seal. We decided that a simpler method might be to seal the gap with a high temperature silicon gasket sealer. The silicon sealer can better fill any small gaps or leaks that might be formed in gasket paper when securing the flange. 3.9 Shaft After reviewing various shaft designs used in similar engines, such as the KJ66 and SR30, we decided to use a design very similar to the KJ 66. Our engine is slightly larger than the KJ 66 therefore, we scaled up the shaft design while maintaining the overall style. The shaft, made of 316 stainless steel, was cut to about 11.5-in in length and then turned down on a lathe to meet our specifications. The design includes a taper on each side of the shaft intended to decrease stress concentrations and eliminate the sharp edges that might infringe upon lubricant flow through the shaft housing. There are two locator steps/bearing seats that serve to position the bearings on each end, these steps are machined to allow a light press fit upon bearing installation. In order to ensure that the shaft was manufactured to be concentricPDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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