Hello meanjo
Quote:
Originally Posted by meanjoe75fan
Diesel dave: you mentioned compressor/turbine combos at 50% efficiency...better tgan piston power. Then wny not delete the piston portion and go with a pure turbine engine? I was told in my flying days that a piston would handily beat a turbine in "power-specific fuel consumption": is that no longer true?
|
What Dave was referring to is mechanical efficiency, not thermodynamic. The best low power turbines can return about 20% thermodynamic efficiency. And conversely the mechanical efficiency of a piston as compressor and expansion engine is better than 95%.
-mort