With the compressor and the turbine (a high-pressure spool; a spool refers to a combination of a compressor and a turbine linked by a single shaft), the basic design of the jet engine is done. However, modern aircrafts are slightly improved from this version of the jet engine. By attaching another low-pressure spool to the system, the outer turbine located on the low-pressure spool will rotate at a lower speed than the inner turbine, which would reduce the centrifugal stress at the end of the engine, improving the blades' lives.
In terms of designing the low-pressure second spool, the compressor was not difficult since it only required basic extruding and creating circular patterns, but the turbine was quite difficult due to the radius of the turbine increasing further down. The complete design for the turbojet engine after it is finished will be uploaded to https://sites.google.com/pupils.nlcsjeju.kr/moojokim-3d-cad-modeling/27-turbofan-engine. Browse at your own will!
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