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ID:32351763
大小:3.00 MB
页数:69页
时间:2019-02-03
《三角环流滴灌灌水器设计及实验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、江苏大学硕士学位论文ABSTRACThthedevelopmentofdripirrigationemittersarethekeypartswhichaccountforthecostof25—35%ofthedripirrigationsystem.It'sperformanceandqualitydirectlydeterminesthehydraulicperformanceofdripirrigationsystem.Atpresent,widelyusedformofemittersflowstructureshowsas
2、inglemodelofthelabyrinthcha衄e1.Studynewemitterswithindependentintellectualpropertyfights,hydraulicperformanceandbetteranti-doggingperformanceisofgreatsignificance.Basedonthehydrauliccharacteristicsoftrianglecirculation,sudden—expansionpipeandsuddencontractionpipe,design
3、edanumberoftrianglecirculationemitterswithdifferentstructuralforms,applicationofCFDnumericalsimulationsoftware,orthogonalexperiment,parametricdesign,structureoptimization,prototyping,andlaboratorytesting,analyzetheinfluenceofflowstructurecharacteristicsandsizeonhydrauli
4、cperformanceandanti—cloggingabilityofemitters,anti-clogging,theresultsareasfollows.(1)TheresultsofCFDnumericalsimulationshowsthatthevalueofflowindexoftrianglecirculationemittersisabout0.5withgoodhydraulicperformance.Byorthogonalexperimentandparametricget,increasingthech
5、annelwidth6,unitschamferingradianr/,sharpcoiner仅,theflowindexincreases,butwithdifferentextend,andthechannelwidthbactsthemostsignificantinfluence.FlowdepthD,widthb,inletaandunitheighthallaffectthedischargeofemitterswithdiminishingimpact.Thedischargeincreasesassharpcorner
6、a,flowdepthDandflowwidthbincreasing.Increaseingtheunitsharpcornera,chamferradianr/,reducingthechannelwidthb,canimproveanti—doggingperformanceofemitters.Establishtheregressionmodelbetweendischarge,flowindexandstructureparametersthroughmultiplelinearregressionanalysis,pro
7、videtheoreticalbasisforstructuredesignandquantitativeanalysisoftrianglecircularemitters.Optimizetheunitsstructureaccordingtothefigureofvelocityvector,designeddoublecha彻elandsinglecha如elemitterswithcertaindischargesthroughfouroptimizingschemes.V三角环流滴灌灌水器设计及实验研究(2)Byrotat
8、eingthesmalltriangleintheflowunitsoftrianglecirculationemitters,evolveanewtypeoftrianglebypassemitterflow.Anal
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