The variation of specific fuel consumption with ambient temperature and compression ratio is also shown inFigure 4 . Where . The variation of operating conditions (compression ratio, turbine inlet and exhaust temperature, air to fuel ratio, isentropic compressor and turbine efficiency, and ambient temperature) on the performance of gas turbine (thermal efficiency, compressor work, … The gas or. Thermal efficiency and coefficient of performance are great for comparing the performance of thermodynamic cycles, but they don’t work well for individual processes. •Isentropic efficiency of the turbine is defined in a manner similar to that of the compressor. Fig. Isentropic Efficiency Turbines For a turbin e the desired output is the work produced, and the isentropic efficiency is defined as "the ratio of the actual work output of the turbine to the work output that would be achieved if the process between the inlet and the exit pressure were isentropic". Their simulation results showed that the increase in pressure ratio and isentropic efficiency of air compressor and gas turbine efficiency improves thermodynamic performance of the system. Thamir Ibrahim. Create a free account to download. The isentropic efficiency of a compressor is 85% in a gas turbine plant having pressure ratio of 4. Variation of stage efficiency of an IFR turbine with blade-to-isentropic gas speed ratio. Calculate the corresponding polytropic efficiency of the compressor. The isentropic efficiency of the gas turbine is among the important parameters of the design and is indicative of how far the gas turbine performance is from a reversible process. The gas turbine is examined for operating conditions shown in table 1 with the fluid properties shown in table 2. Typical Isentropic efficiencies range from 70-90%. Process 3 – 4: isentropic expansion in the turbine ... From the above equation, it is seen that the efficiency of the air standard gas turbine cycle increases with increase in pressure ratio (R) and the type of working fluid. The air is drawn into the compressor at 1 bar 15oC and is compressed with an isentropic efficiency of 94% to a pressure of 9 bar. Also, the most exergy destruction rate takes place in the is the isentropic efficiency of the turbine, is the specific heat ratio of gas and is the pressure ratio of the compressor. The turbine’s desired output is the isentropic work output. Previous question Next question Transcribed Image Text from this Question. The stagnation pressure, static pressure and temperature at inlet of a compressor in a gas turbine plant are 1 bar, 0.93 bar and 10°C, respectively. As shown inFigure 3 adding regeneration to the gas turbine cycle results in increase of the thermal efficiency of the gas turbine cycle. In the axial turbine, cascades of small airfoils are mounted on a shaft that turns at a high rate of speed. The isentropic efficiency of the turbine is also 94%. In outward flow radial turbine stages, the flow of the gas or steam occurs from smaller to larger diameters. Download with Google Download with Facebook. The isentropic work is the maximum possible work output that the adiabatic turbine can produce; therefore, the actual work is less than the isentropic work. plant. Figure 3 shows the variation of compression ratio, isentropic compressor and turbine efficiencies on overall thermal efficiency for CCGTPP. 2011. For compressors, the isentropic efficiency is the ratio of minimum theoretical work going into the compressor to the actual work per mass flow. In his 1945 textbook, The Modern Gas Turbine , Sawyer reviewed the test program carried out at the BB works in Baden. 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