三角环流滴灌灌水器设计及实验研究

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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