gn.
3.conventionally,theimpellersandtheotheraerodynamicpartsofc

entrifugalcompreorsareinsinglepointdesign,i.e.,aredesignedaccordingtoagivenoperationpoint.theelementssodesignedcanratherwellworkundertheoperationconditionearthedesignpoint.butwhiletheoperatingconditioarefaroffthedesignpointtheymayworkbadly.thediertationfirstintroducestheideasof“multi-pointdesig”formaeronauticalairfoildesignintotheaerodynamicdesigofthecascadesofcentrifugalcompreors.inotherwords,throughtakingtwoormoreoperatingpointsasthedesignpoints,itisexpectedthatanoptimalcascadedesigncanbeobtainedthatmakesagood“tradeoff”betweenthedesignpoints.themathematicalformulatioofthemultipointdesignproblemforanaerodynamiccascadearefirststated.threeparetogeneticalgorithmstrategies,i.e.,globalfitnetournament,two-branchtournament,andparetodominatetournament,arethenproposedforeffectivelyobtaintheparetosetofthemultipointdesignproblemsofcascades.thegenetic-algorithm-basedmultipointdesignmethodsproposedaresuccefullyexaminedwithanexperimentofapracticaldiffusercascadedesign(seefan,xi,wang,journalofpowerandenergy,proc.itn.mech.engrs,2000,fan,xi,wang,chinesejournalofmechanicalengineering,2000).
4.thesuccefulusesofgeneticalgorithmsinthecascadeshapeoptimizatiomotivatetheauthortoattemptanalicationofgeneticalgorithmstotheflowfeildanalysisofcascades.inthediertation,someanaloguesbetweenevolutionoflivingorganismsystemsinnatureandinanimatephysicalsystemsgovernedbylawsofcoervationarestudiedandprobed.fromtheseanaloguesanewcfdme

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