Parametric study of gas turbine cycle with fogging system

Abstract EN

Fogging system is used as a method for cooling the inlet air to the compressor by the direct injection of water, in order to reduce the ambient air temperature until it reaches the wet bulb temperature and thus increasing the net power.

The effects of ambient temperature, relative humidity, firing temperature, and pressure ratio on the open cycle gas turbine performance are studied.

The ambient temperature range, which is considered in this study, ranged from (10 to 60°C) ; the relative humidity range was (10 % to 90 %), the pressure ratio range was (3 to 23) and the firing temperatures were 1100K, 1200K, 1400K, and 1600K.

The results of this study showed that output power and efficiency increase continuously with increasing the firing temperature, and reduces with increasing the ambient temperature, and the efficiency increases with pressure ratio reaching a maximum value then it begins reducing.

When the relative humidity increases it is gives a reverse effect on the power and efficiency of this cycle.

The present work reveals that using fogging system in the front of the compressor in the open cycle gas turbine can improve the efficiency and enhance the output power of the cycle due to reducing the inlet air temperature interring to the compressor.