gas turbine.ppt

with the increase of the compressors inlet temperature, the compressor work is increased as the temperature of the air increases, the air density and, consequently, the air mass flow decreases. The reduced air mass flow directly causes the gas turbine to produce less power output. the higher intake-air temperature results in an increase of the specific compressor work and, therefore, in a further reduction of the power output. The maximum cycle temperature is limited by metallurgical considerations the efficiency has a peak value at a particular pressure ratio (rp). The fall in efficiency at higher pressure ratios is due to the reduction in fuel supply to give a fixed turbine inlet temperature (T3) resulting from the higher compressor delivery temperature (T2) being outweighed by the increased work necessary to drive the compressor. Cooling the air at compressor intake helps increasing the density of air flowing into the plant Ambient air enters the cooling coil cooler at Ta and /a. Air passing over the outer surface of the coil experiences a drop in temperature and possibly a decrease in specific humidity (x). The coil temperature can be adjusted to allow air to reach certain desired temperature. About 39.6% of the work produced by the turbine is consumed by the compressor to compress the ambient air to 5 bar pressure About 39.6% of the work produced by the turbine is consumed by the compressor to compress the ambient air to 5 bar pressure * brief introduction A gas turbine engine is an air-dependent,thermal jet propulsion device that uses gas-driven turbine wheels to drive a compressor, making continuous operation of the engine possible. principle Gas turbine engines depend on the principle of the air cycle, where, ambient air is first compressed to a maximum pressure level, at which point fuel heat energy is added to raise its temperature, also to a maximum level. The air is then expanded from high to low pressure