DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT

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DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT ( development-an-ultra-high-efficiency-gas-turbine-engine-uheg )

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in the plot as well. Figure 79 and Figure 80 show the compressor and turbine mass flow rates. As shown in these figures, the compressor and turbine mass flow rates fluctuate with the similar pattern as the fuel schedule. However, there are a few important parameters that need to be discussed. The first thing to notice is that at the beginning (the first fluctuation cycle), the response is not quite similar to the second and third fluctuation cycles. That is because of the Transient response that exists in the system as it starts on the new fuel schedule. This transient response is usually damped away quickly and what remains is the steady fluctuations due to the driving profile (fuel schedule). The next important parameter is the time lag between the mass flow rate responses and the fuel schedule. These delays represent the reaction time of the engine and the control system. In other words, they describe how long it takes each component to adjust itself to the changes in fuel schedule. The next factor to notice is the amplitude values for different profiles. As shown in Figure 79 and Figure 80, the amplitudes of the compressor and turbine mass flow rates are about 3%. These values are less than half of the fuel schedule amplitude (10%) which shows that the turbine and compressor flow rates do not oscillate as intensely as the fuel. Figure 81 and Figure 82 show the inlet and exit temperature distributions for each turbine set. As shown in these figures, the temperature profiles fluctuate with amplitudes of about 5-6%. The fluctuation amplitudes are slightly increased in the later turbine stages which is due to the fuel injection in the second and third injector rows. 128

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