Gasturb软件培训材料 第十七节 推力管理.pdfVIP

Gas Turbine Design and Performance THRUST MANAGEMENT 1 50m - 42p Overview • Thrust Rating Principles • Rated Thrust Levels – Take Off – Max Continuous, Max Climb – Idle – De-Rating e k z r u K • Calculating Rating Schedules m i h c a o J © t h g i r y p o C April 2013 2 49m - 41p Civil Engine Thrust Ratings • When developing power from an engine it is necessary to observe certain restrictions in order to avoid exceeding the engine’s design limitations • The levels of thrust which meet the design limitations are referred to as thrust ratings • The ratings we will discuss are standard e k z r thrust ratings used by engines currently used u K m i in commercial service h c a o J © t h g i r y p o C April 2013 3 48m - 40p Thrust and Engine Deterioration • Engines deteriorate… – Blade tip and labyrinth seal wear – Erosion and fouling – Loss of component efficiencies • However, thrust should remain constant e • Keeping Engine Pressure Ratio EPR k z r u or corrected N1 constant yields K m i h const