简介:描述了SK—H混凝土高性能引气剂的研制。通过在松香进行皂化之前先对松香进行部分酯化反应,以改善松香的化学结构,提高了松香的分子量,使之有利于作为引气剂分子的骨架,保证气泡形成后的液膜具有足够的黏度和弹性,同时加入了优良的气泡稳定组分来提高气泡的稳定性。研制的SK-H高性能引气剂的混凝土性能指标满足国标一等品的要求,产品在气泡间距系数(133μm)、气泡平均半径(71μm)、气泡均匀性、稳定性等关键技术指标方面均优于目前国内水平。混凝土抗冻融300次时,动弹性模量为97%,混凝土具有优良的抗冻融耐久性。所提出的工艺参数可靠,目前已按确定的工艺条件和参数组织批量生产,并已用于工程。该产品在合成过程中只在酯化反应时生成少量的水,不排放废物,属环保型产品。
简介:ThenumericalsolutionofincompressibleviscousflowoveranaerofoilisobtainedbyH-typegridsandaspecialdifferencescheme.Themethodofmassfluxcorectionisintroducedwithsuccessinordertoaccelerateconvergenceiniterationofvelocityandpressurecalculation.
简介:TheaddedresistanceofKVLCC2inshortandregularheadwaveshasbeenstudiedtheoreticallyandexperimentally.Modeltestsareperformedtodeterminehowwelltheasymptoticformula(Faltinsenetal.1980)predictsthetypicallevelofaddedresistanceinshortwaves.Becausetheasymptoticformulaneglectstheeffectsofshipmotions,itiscombinedwiththeoreticalmethodstocalculatetheaddedresistanceinlongwavesusinganfunctiontopredicttheaddedresistanceintheintermediatewavelengthregionwherebothshipmotionsandwavereflectionareimportant.Auniquefeatureofthisexperimentisthattheshipmodelisdividedintothreesegmentstoexploretheaddedresistancedistributionwithrespecttohullsegment.Thispaperdiscussesthesensitivityofexperimentalresultstothequalityoftheincidentregularheadwaves.Moreover,anovelprocedureforanalyzingaddedresistanceisdescribed.Finally,theexperimentallydeterminedaddedresistanceofKVLCC2iscomparedwiththeoreticalresults.Itisshownthattheaddedresistancefromthecombinedtheoreticalmethodsagreeswellwithexperimentalresultsinboththeintermediateandshortwaveregions.Theuseofhullsegmentsshowsthataddedresistanceisconcentratedprimarilyatthebow.
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简介:Whenabodynavigateswithcavityinshallowwater,bothflexiblefreesurfaceandrigidbottomwallwillproducegreatinfluencesonthecavityshapeandhydrodynamicperformances,andfurtheraffectthemotionattitudeandstabilityofthebody.Inthepresentwork,characteristicsofthenaturalcavitatingflowarounda2-Dsymmetricalwedgeinshallowwaterwereinvestigatedandtheinfluencesoftwotypeboundariesontheflowpatternwereanalyzed.TheVolumeOfFluid(VOF)multiphaseflowmethodwhichissuitableforfreesurfaceproblemswasutilized,coupledwithanaturalcavitationmodeltodealwiththemass-transferprocessbetweenliquidandvaporphases.Withintherangeofthecavitationnumberforcomputation(0.07-1.81),thecavityconfigurationswouldbedividedintothreetypes,viz.,stabletype,transitiontypeandwake-vortextype.Inthisarticle,theshapesofthefreesurfaceandthecavitysurface,andthehydrodynamicperformanceofthewedgewerediscussedundertheconditionsofrelativelysmallcavitationnumber(<0.256).Thepresentnumericalcavitylengthsgenerallyaccordwithexperimentaldata.Whenthecavitationnumberwasdecreased,thecavitywasfoundtobecomelongerandthicker,andthescopeofthedeformationofthefreesurfacealsograduallyextends.Thefreesurfaceandtheuppercavitysurfacecorrespondfairlytotheirshapes.However,thelowersideofthecavitysurfacewasratherleveledduetotheinfluenceofwallboundary.Theliftanddragcoefficientsofthis2-Dwedgebasicallykeeplinearrelationswiththenaturalcavitationnumbersmallerthan0.157,whereasdirectproportionfordragandinverseproportionforlift.
简介:11月27日,随着ZDN2联匝道箱梁的顺利收仓,由公司第二分局郑州陇海路第十二项目经理部承建的11-2标段共11联箱梁施工全部完成,这也是继陇海路第一标段箱梁全线贯通之后,公司承建的四个标段中又一个实现箱梁全线贯通的标段。目前,由公司承建的陇海路工程最西段第1标段桥面铺装己全部完成,部分已完成交面,最东段第12、13标段通车范围内箱梁已全部贯通,第11-2标段如今已实现全部箱梁浇筑完成,正在进行紧张的防撞墙与桥面铺装施工,在后续冬季施工中,项目部将注意保湿保温,缩短养护时间,节约工期,向其他标段学习先进管理经验,组织好现场各项施工,全力推进施工进度,为实现年底通车目标而不懈努力。