Mehdi Rahbar - Operation and Customer Services Department of MAPNA CO
Hiwa Khaledi - Deputy of Engineering Design of Turbo-Tech CO.,

Climatic and load changes will cause changes in operation condition of each component of gas turbine such as; compressor, combustion chamber and turbine. Therefore,recognition of gas turbine behaviour in the off-design performance is very essential. Changes in efficiency and fuel consumption and the other thermodynamic characteristics of aSiemens V94.2 gas turbine in off-design conditions (especially in partial loads) considering the changes of turbine controlmethod have been investigated. The results show that the IGV constant control system has the highest efficiency and the lowestfuel consumption in the simple gas cycle. The TIT constant control system in the combined cycle has the highest efficiency but the highest fuel consumption.

Gas turbine, off-design condition, turbine control system, operation, fuel consumption