Gasturb软件培训材料 第六节 非设计点（下）.pdfVIP

Gas Turbine Design and performance OFF-DESIGN BEHAVIOR 2 e k z r u K m i h c a o J © t h g i r y p o C April 2013 1 50m - 35p Overview • Various Conclusions • Turbojet as Gas Generator • Power Generation – With Power Turbine e – Single Spool Gas Turbines k z r u K m i h c a o J © t h g i r y p o C April 2013 2 49m - 34p Variable Compressor Geometry • Is it possible to shift the operating line of the compressor by resetting the variable guide vanes ? • Resetting the variable guide vanes changes mainly the correlation between corrected spool speed and corrected mass flow. • Correlations that define the position of the operating line in e k the compressor map do not employ the spool speed. z r u K m • Therefore resetting the variable geometry has basically no i h c a effect on the position of the compressor operating line of a o J © t turbojet. h g i r y p o C April 2013 3 47m - 33p Variable Compressor Geometry Secondary Effects • Closing the variable guide vanes decreases efficiency significantly at high corrected flow • decreasing efficiency raises the operating