简介:Thispaperpresentsanexperimentalstudyresultofflowfieldofadual-channelburner.Inordertosolvetheubiquitousproblemofbadrigidityofjetsindual-channelburners,wedgeswithdifferentarrangementsandstructuralparameterswereaddedtodifferentpositionsattheoutletoftheburners.LaserParticleImageVelocimetry(PIV)wasusedinthisstudytomeasuretheflowfieldtoinvestigateinfluenceofthewedgesonflowfieldofthedual-channelburner.Experimentalstudyshowsthatfixingwedgesatbothrightandleftsidesoftheburner'soutletcanincreasetheintensityofrecirculationwithoutchangingthesizeoftherecirculationzoneandenhancetherigidityofjetsviaincreasingspeedofthetwoprimaryairjetsattheoutlet.
简介:AkindofZrO2ceramicmaterialforporousmediaburnerwaspreparedbypolymericspongeprocesswithstartingmaterialsofzircon,zirconiapowder,microsilica,andballclay,andbinderofsilicasolthroughreaction-sintering.Theeffectsofmicrosilicaadditiononcoldcrushingstrengthandzirconia/zirconaddingratioonthermalshockresistancewerestudied.Theresultsshowthattheporousmediamaterialhasproperporosity,highstrength,andexcellentthermalshockresistancewhenzirconiaadditionis85%andzirconadditionis5%.Theperformanceindexesare:porosity82%,coldcrushingstrength3.1MPa,thermalshockresistancemorethan10cycles,andgoodthermalshockresistanceto1500℃flame.
简介:Inordertoinvestigatethefiresuppressioneffectivenessofwatermistwithmetalchlorideadditives,ultrafinewatermistsofthesesaltswithdiametersabout10μmwereintroducedintoCH4/airnon-premixedflameinthecupburner.Resultsshowedthatthesedropletshardtomakeitselftotheflamefrontunderthecupburnerflowconditionsfunctionedasacarrierofthevaporizedsolidparticlesoritsdecomposedmaterials.Themetalchlorideimprovedfiresuppressionefficacyofwatermistwhichwereaffectedbythetypeandconcentrationofmetalchloride.Onamassbasis,thereisafiresuppressioneffectivenessrelationshipofMgCl2