PER FORMANCE IMPROVEMENT OF A TURBO SHAFT ENGINE USING WATER INJECTION

Abstract

ABSTRUCTA 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 lessefficiently in a hot ambient especially during takeoff because the engine at takeoffneeds maximum power. The engine performance is also calculated after waterinjection at compressor entrance. A new mixture (water and air), the dew pointtemperature has also been calculated at compressor entrance and in every stage toensure that no condensation of water vapor is take place on the blades of thecompressor. 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 waterinjection (0.2 %, 0.5 %, 0.7 %, and 0.8 % of air mass flow rate with constanttemperature (10 C0)).The results showed that an increase in the amount of waterinjection leads to decrease in the mixture temperature and to an increase in thespecific heat at constant pressure.The percentage improvement in the performance for the specific power, thermalefficiency and specific fuel consumption at (Ta=55 C0 ) and•m =0.8% of air massflow rate at the entrance of the compressor were (14.7, 12.6 and 11.3) respectively .