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DESIGN OF MINIATURE TURBOJET ENGINE 37 3.0 Methodology This chapter explains how we designed and manufactured each component of our engine. We present each component and outline the considerations and challenges encountered during the design process. Additionally, we discuss the materials and manufacturing methods used to produce each component. We have included the two-dimensional CAD drawings of each part in Appendix D. 3.1 Compressor In order to simplify the design and manufacturing process and complete the project within the given time constraint, our team decided to purchase a compressor wheel. After examining the literature regarding compressor wheels used in small gas turbine engines, we concluded that a single stage axial compressor would not offer a high enough compression ratio or efficiency to be used in an engine of our size. Engines similar in size to our own design, such as the SR-30 described in Chapter 2.2, utilize a centrifugal compressor in order to achieve adequate compression ratios and efficiencies. For these reasons, we chose to investigate centrifugal compressor wheels used in automotive turbochargers. We found that the Garret GT4202 compressor wheel provided a mass flow rate and pressure ratio, at our desired RPM, similar to those recorded in SR30 test data (Witkowski, White, Ortize Duenas, Strykowski, & Simon, 2003). Additional benefits of selecting this compressor were its availability for purchasing and the accessibility of its compressor map. The compressor map for the GT4202 can be seen in Figure 9.PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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