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Conceptual Design of a Supersonic Jet Engine

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Conceptual Design of a Supersonic Jet Engine ( conceptual-design-supersonic-jet-engine )

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3.4 Mechanical design 3.4.1 Software description The discs have been designed using T – AXI DISK V2.5, a software developed primarily for education purposes. The system can be used to design multistage compressors and turbines from a small number of physical design parameters [26] 3.4.2 Discs To carry out the disc analysis, the designer needs the aerodynamic properties of the component, such as stage geometry, RPM and temperatures. Due to time limitation, the disc analysis has only been carried out on the HPC and the HPT where the disc stresses are the highest due to high disc speeds. The RPM of the HP shaft is often limited by disc stresses in the HPT rather than the first stage 𝑀𝑡𝑖𝑝,𝑟𝑒𝑙 for the HPC [27]. The disc designs: hyperbolic, web, continuous slope and ring can be seen in figure 8. Figure 8: Different types of disc designs [28] Target safety line The target safety line is a safe margin until the material starts to yield, this has been kept at the default 10%. Optimization The optimization was carried out with the T – AXI DISK built in function, parametric disc, which optimizes the disc in order to get a design that meets the target safety line and has the lowest possible weight. Parameters such as rim width, bore width, bore radius etc. need to be set by the designer before the optimization can start. 3.4.3 Shafts The mechanical efficiencies of the shafts are input parameters to the thermodynamic cycle analysis, in this work they are assumed to be 99,5% for both shafts [11]. No further shaft assumptions or calculations have been made. 28

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