A
ahmed atta
Guest
Thank you Gerald



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Hi Ahmed, I don't do any calculations, mostly trial and error....
That said, diameters of both wheels should be same in most cases and works fine. However, when having a good engine with efficient NGV/turbine combination we can increase impeller diameter to max 106% compared to turbine diameter. This wil give some increase in power for the same engine diameter/weight. (With different reaction turbine we can go even further but that only gives more torque to the shaft, no more direct power, good for turboprop engines)
Here some comparison for a typical 80N engine with 66mm turbine wheel:
66mm = 84N thrust @ 120K rpm
68mm = 96N
70mm = 108N
70mm turbine wheel:
70mm compressor 140N thrust @ 120K rpm
72mm = 160N
74mm = 180N
Data above gained via tests, not calculated.
Hope this helps?
Best regards,
Gerald
after 1 years over in a box the engine run again![]()