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In the last part of this research, a dynamic simulation is performed on the entire engine using the nonlinear generic code GETRAN developed by Schobeiri [1], [30]. The simulations are in 2D (space-time) and include majority of the engine components, i.e. compressor, turbine, injectors, diffuser, control system, pipes, etc. The time-dependent simulations are performed in variable design and off-design conditions that engine goes through during its performance. Three main conditions are simulated via fuel schedules applied through fuel valves which include sinusoidal, Gaussian, and step function. The results show that fluctuations in the fuel flow rate lead to fluctuations with similar patterns in the majority of the system parameters such as compressor and turbine mass flow rates, temperatures, pressures, power, shaft speed, etc. However, the fluctuation profiles in different parameters are different in amplitude and typically have a time lag compared to the fuel schedules. The time lag represents the reaction time of the engine and the control system to adjust itself to the changes in fuel flow. Regarding the intensity of the fluctuations, usually mass flow rates of turbine and compressor and shaft rotational speed fluctuate with lower amplitudes compared to the fuel schedule. The intensity of fluctuation in those parameters are directly affected by the rotating shaft moment of inertia. On the other hand, the fluctuation amplitudes in temperatures, and compressor and turbine powers usually tend to be higher. It is also seen that generator (or net) power has a very similar fluctuation pattern to the fuel schedule, both in shape of the profile and intensity of the fluctuation. Regarding the thermal efficiency, it is seen that the range of the changes is relatively lower than the other parameters. That means the system performs near the design point efficiency throughout the entire cycle. However, an increase in the total average fuel in the system 157PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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