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Figure 83 and Figure 84 show the compressor and turbine sets’ power distributions, respectively. As shown in the figures, power values for these components fluctuate with an approximately 7-10% amplitude which is close to the fuel flow fluctuation amplitude. It should also be noted that Turbine 4 which consists of three turbine stages produces a much higher amount of power compared to the other turbine sets with one stage each. Figure 85 shows the total power distributions for turbine, compressor, and generator. The generator power (net power) is calculated by subtracting compressor power from turbine power and reducing mechanical and winding losses. As seen in this figure, the fluctuation amplitudes for turbine, compressor, and generator total powers are approximately 7%, 8%, and 10%, respectively. Figure 86 shows the engine thermal efficiency which is calculated by dividing the generator power by the total fuel energy. As shown in this figure, the efficiency fluctuates between 44% and 46%. That means the range of fluctuations in efficiency is relatively lower than the other parameters. In other words, the system’s efficiency does not drop noticeably, and it performs near the design point efficiency (45%) throughout the entire cycle. Figure 87 shows the non-dimensional shaft rotational speed. The amplitude is 3.9% which is relatively low compared to the fuel schedule. The total moment of inertia about the axis of rotation for all rotating components including shaft, rotor blades, generator, etc. is shown in the figure. The moment of inertia determines the shaft response and the intensity of the fluctuations in rotational speed. 131PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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