Conceptual Design of a Supersonic Jet Engine

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4.3.5.2 LPT The first stage LPT mean radius was set to correspond with the last stage HPT mean radius in order to achieve a decent stage loading and to approximately align with the fan to reduce flow turning. π‘€π‘Žπ‘₯,π‘œπ‘’π‘‘ was set high to reduce the rotor outlet area, thus reducing 𝐴𝑁2. Since 𝐴𝑁2 will be lower on the first stage due to the smaller area, calculations are only performed on the second stage. The first stage stator was replaced with an aerodynamically loaded strut to accomplish the same function as a stator, while giving structural support to the engine. With two stages there is no exit swirl entering the LPT exhaust at design point. Some swirl will however be present at off-design conditions. The LPT is shown in figure 26. Figure 26: LPT component Some key turbine data can be found in table 13. The velocity triangles at the mean blade can be seen in figure 27 and the corresponding data can be seen in table 14. A full output of stage by stage performance can be found in appendix C. 𝑴𝒂𝒙,π’Šπ’ 𝑴𝒂𝒙,𝒐𝒖𝒕 π‘¨π‘Ήπ’Šπ’ 𝑨𝑹𝒐𝒖𝒕 𝝀𝑡 𝑬𝑰𝑺 π‘Ίπ’•π’‚π’ˆπ’† π‘»π’†π’Žπ’‘. 𝒅𝒓𝒐𝒑 0,35 π‘΅π’–π’Žπ’ƒπ’†π’“ 𝒐𝒇 π’”π’•π’‚π’ˆπ’†π’” 2 0,5 π‘¨π’—π’ˆ. 𝝍 2,06 1,84 π‘¨π’—π’ˆ. Ρ„ 0,81 6,72 πœΌπ’‘π’π’π’š 0,934 0,05 𝑴𝒉𝒖𝒃,𝒓𝒆𝒍,,π’”π’•π’ˆπŸ 0,40 2025 𝑴𝒉𝒖𝒃,𝒓𝒆𝒍,π’”π’•π’ˆπŸ 0,44 0,089π‘š 99,7𝐾 𝑻𝒐𝒕𝒂𝒍 π’π’†π’π’ˆπ’•π’‰ 𝑳𝒂𝒔𝒕 π’”π’•π’‚π’ˆπ’† π‘¨π‘΅πŸ 5115 Table 13: Key LPT data 41

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