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Another parameter which can be introduced to compare different setups influence on turbine is the “isentropic volume flow ratio”. This is the ratio between isentropic outgoing and incoming volumetric flows with unit of m3/s. This is shown by isentropic flow ratio here or simply (Isentropic.flow). Since this parameter shows the change in the volume of fluid, it indicates the amount of compressibility of the fluid in the Turbine. In Table 10 shows that more pinch point temperature and degree of supper heat means more isentropic flow ratio and consequently more compressibility effect from turbine is sensed. Isentropic flow ratio is an important factor since it is related to turbine efficiency. Isentropic flow ratios of above 0.5 are not interested because in this case the Turbine efficiency will be less than 80%. This is mainly true for axial single stage turbines; according to G. Angelino, C. Invernizzi, E. Macchi, (1991).49 Table 10: Isentropic flow ratio change with pinch point and degree of superheat modifications 49G. Angelino, C. Invernizzi, E. Macchi, Organic working fluid optimization for space power cycles, in: G. Angelino, L. De Luca, W.A. Sirignano (Eds.), Modern Research Topics in Aerospace Propulsion, Springer‐Verlag, New York, 1991. 59PDF Image | Exergy
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