燃气轮机计算.pps

ME423Chapter8(Rc)whichwillgivethebestoverallefficiencyforagivenTmax. MASSFLOWRATEtogivethemostsuitabledesiredpoweroutput.  Aftersuchpreliminarycalculations,,*,massflowratem*andpressureratioR*.hentheoff-¢(OP)ponent¢whentheengineisrunningatasteadyspeed(EQUILIBRIUM). TheplotoftheseOP'sformtheEQUILIBRIUMRUNNINGLINE(ERL).PredictionofTerformanceofSimpleGasTurbineForthewholerangeofoperatingspeeds,;thepoweroutput,(SL).ThismarginindicatesaMarginofstability;,,, &: Europe:colddaysinwinter, America:hotdaysinSummer forairplanes:Runwaylength(safety)and payload(economics)-DesignPerformanceofSimpleGTHerewewilltrytoanalysea: a)Singleshaftunitdeliveringshaftpower. b)Freeturbineengine-powerturbinedrivestheload.c)Simplejetengine,wheretheusefuloutputisfromthe -twospoolengines,Turbofan&transientperformanceChapter9Flowcharacteristicsofafreeturbineandpropellin