الفهرس 
INTRODUCITONOnly 14 pages are availabe for public view
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Abstract
Gas turbines are widely used in many applications like power generation and driving different rotating machines in oil and gas industries. As time goes on, faults such as fouling, erosion, corrosion, blade tip clearance, object damage and thermal distortion can cause performance degradation which has a huge impact on energy consumption and leads to high operation and maintenance costs. In this report we will go through the systems of the aeroderivative gas turbine model GE PGT25+ and study its performance by carrying out thermodynamic analysis. A thermal model was developed using Engineering Equation Solver (EES) program. To be used to simulate the gas turbine at several loads to check its performance and efficiency and the effect of deterioration on the performance, we used actual output data from the unit control system to study the performance and check how it varies from the design condition. The effects of some parameters, such as compressor inlet temperature (𝑇1), pressure ratio (𝑟𝑝) and the low-pressure turbine inlet temperature (𝑇4), on the performance parameters of open cycle gas turbine were discussed. The turbine net power output (𝑊𝐻𝑆𝑃𝑇), the thermal efficiency (𝜂𝑡ℎ), compressor work (𝑊𝑐), the high-pressure turbine inlet temperature (𝑇3), isentropic efficiencies of compressor and turbine (𝜂𝑠) and the fuel consumption of the gas generator (𝑚̇𝑓) were taken as the performance parameters. The values of these parameters were calculated using basic cycle equations and variables values of thermodynamic properties. Other variables such as lower heating value, and combustion efficiency were assumed to be constant. Also, in this report we will discuss the performance monitoring technique on gas turbines and how to use to predict deterioration and early failures in gas turbines. Monitoring the performance of gas turbines became urgent and vital, as it helps to obtain and detect early performance deterioration and to be used in fault diagnostics and save maintenance cost.