The preliminary design of radial inflow turbines

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1、ThePreliminaryDesignofRadialInflowTurbinesA.WhitfieldAprocedureisdescribedthatdevelopsthenondimensionaldesignofaradialinflowSeniorLecturer,turbinerotor.Thedesignisdeveloped,foranyspecifiednondimensionalpowerUniversityofBath,ratio,withtheobjectiveofminimizingtheinletanddischargeMachnumberssothatBath

2、,UnitedKingdomthepassagelossesareminimized.Initiallystate-of-the-artefficienciesareassumed,butthesearelatermodifiedthroughthespecificationofempiricallosses.Theresul•tantnondimensionaldesigncanbetransformedtoabsolutedimensionsthroughthespecificationoftheinletstagnationconditionsandthemassflowrateoft

3、heworkingfluid.1IntroductionThedesignofradialinflowturbinesisdescribedbyRohlikminimumlossesirrespectiveofthelossmodel,andassociated(1968,1975),Glassman(1976),RodgersandGeiser(1987),uncertainties,used.Rodgers(1987),andWhitfieldandBaines(1989).Thesepro•ceduresaredevelopedthroughtheapplicationofthefun

4、•2InitialDesignSpecificationdamentalturbomachineryandgasdynamicequations,similaritytechniques(particularlyspecificspeed),andem•Inordertodevelopageneralprocedure,itwillbeassumedpiricallossmodels.TheproceduredevelopedbyRohlik(1968)initiallythatonlythedesiredpoweroutputisspecified.Theledtoaseriesofcor

5、relationswithspecificspeed,whichcouldpowerdevelopedbytheturbineisgivenbybeusedasdesigncharts.Theseresultsare,however,restrictedyRbythelimitationsbuiltintotheoriginalanalysisprocedure.W/m=hM-hm=-

6、rs.Thesemayandcanbedevelopedtothenondimensionalpowerratioincludethepoweroutput,massflowrate,inletstagnationcon•Wditions,rotationalspeed,andpossiblerestraintsontheoverall

7、weroutput,massflowrate,andinletstagna•parameterssothatthedesigncanproceed.Theobjectivesfortiontemperatureareknown,thenS„canbecalculateddirect•eachdesignmaydiffer;however,acommonaimwillgenerallyly.If,however