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1、噴嘴結構對高壓水射流影響及結構參數優(yōu)化設計1韓啟龍,馬洋(第二炮兵工程大學動力工程系,陜西西安710025)摘要:噴嘴是產生高壓水射流的關鍵部件,其結構形式對射流動力學性能有很大影響。以圓柱形噴嘴為對象,進行噴嘴結構對高壓水射流的影響分析及結構參數優(yōu)化設計。采用兩相流計算流體力學模型進行噴嘴內外的射流流場分析。為節(jié)省計算資源,在優(yōu)化設計時引入Kriging代理模型替代計算流體力學模型。分別采用改進的卄?劣分類遺傳算法(NondominatedSortingGeneticAlgorithm,NSGA-II)和基于分解的多目標進化算法(MultiObje
2、ctiveEvolutionaryAlgorithmsbasedonDecomposition,MOEA/D)進行單目標和多目標優(yōu)化設計。研究結果農明:直線型噴嘴總體性能較優(yōu),【叫塑噴嘴次之,凸型噴嘴性能最差。以直線塑噴嘴為設計對象,以射流初始段長度和流量為H標,得到了單目標和多H標優(yōu)化設計結果,單目標優(yōu)化時,兩個指標較基準外形分別提高14.71%和27.56%。多目標優(yōu)化時,優(yōu)化得到的半錐角處于[15.4,89.8]區(qū)間上?;诖砟P秃瓦M化算法的全局優(yōu)化方法在進行噴嘴的優(yōu)化設計時是冇效的。關鍵詞:高壓水射流;噴嘴;全局優(yōu)化;兩相流;代理模型;MO
3、EA/D中圖分類號:V411文獻標志碼:A文章編號:InfluenceofnozzlestructureonhighpressurewaterjetandoptimizationdesignofnozzlestructureparameterHANQilong,MAYang(SecondArtilleryEngineeringUniversity,Xi'an710025,China)Abstract:Nozzleisthecrucialcomponentusedtogeneratehighpressurewaterjet,anditsstructur
4、eformhaslargeinfluenceondynamicperformanceofhighpressurewaterjet,sotheinfluenceofnozzlestructureonhighpressurewaterjetisanalyzed,andtheoptimizationdesignofnozzlestructureparameterisimplementedinthispaper.Twophaseflowcomputationalfluiddynamicsmodelisemployedtoanalyzeflowfield.Th
5、eKrigingsurrogatemodelisusedtoreplacethecomputationalfluiddynamicsmodelintheprocessofoptimizationdesignforreducingthecomputationalresources.TheNondominatedSortingGeneticAlgorithm(NSGA-II)andMultiObjectiveEvolutionaryAlgorithmsbasedonDecomposition(MOEA/D)arerespectivelyemployedt
6、ocarryoutsingleandmultiobjectiveoptimizationdesign?Theresearchresultsweresummarizedasfollows.First,thegeneralcapabilityofline-formnozzlewasthebest,thentheconcavity-formnozzle,andtheprotruding?fbnTinozzlehastheworstcapability.Second,thesingleandmultiobjectiveoptimizationdcsignof
7、line-formnozzlewasimplemented,inwhichcorezonelengthandmassfluxofwaterjetweretakenasoptimizationobjectives.Comparedtothebaseline,thetwoindexesincreasedby14.71%and27.56%respectivelyafterthesingleobjectiveoptimization.Theoptimalsemi-coneangleaftermultiobjectiveoptimizationlocatedo
8、n[15.4,89.8].Third,theglobaloptimizationalgorithmbased