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Question 11.20: The following data pertain to a turbo-jet flying at an altit...

The following data pertain to a turbo-jet flying at an altitude of 9500 m :
Speed of the turbo-jet                                = 800 km/h
Propulsive efficiency                                  = 55%
Overall efficiency of the turbine plant    = 17%
Density of air at 9500 m altitude             = 0.17 kg/m³
Drag on the plane                                        = 6100 N
Assuming calorific value of the fuels used as 46000 kJ/kg,
Calculate :
(i) Absolute velocity of the jet.                                      ( ii) Volume of air compressed per min.
(iii) Diameter of the jet.                                                 ( iv) Power output of the unit.
(v) Air-fuel ratio.

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