Performance improvement of a turbo shaft engine using water injection

الملخص EN

A theoretical study to calculate the performance of the turbo-shaft engine (TV3- 117 MT), used to power the helicopter (MI-17).

It is clear that the engine works less efficiently in a hot ambient especially during takeoff because the engine at takeoff needs maximum power.

The engine performance is also calculated after water injection at compressor entrance.

A new mixture (water and air), the dew point temperature has also been calculated at compressor entrance and in every stage to ensure that no condensation of water vapor is take place on the blades of the compressor.

To satisfy this aim the amount of water injection should not exceed (0.8%) of air mass flow rate depending on the permissible payload of the engine.

The performance with water injection was calculated at different amounts of water injection (0.2 %, 0.5 %, 0.7 %, and 0.8 % of air mass flow rate with constant temperature (10 C0)).The results showed that an increase in the amount of water injection leads to decrease in the mixture temperature and to an increase in the specific heat at constant pressure.

The percentage improvement in the performance for the specific power, thermal efficiency and specific fuel consumption at (Ta=55 C0 ) and • m =0.8% of air mass flow rate at the entrance of the compressor were (14.7, 12.6 and 11.3) respectively .