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1、網(wǎng)絡(luò)出版時間：2017-06-1512:07:28網(wǎng)絡(luò)出版地址：http://kns.cnki.net/kcms/detail/11.1964.s.20170615.1207.002.html農(nóng)業(yè)機械學報網(wǎng)式過濾器濾網(wǎng)堵塞成因分析與壓降計算?宗全利楊洪飛劉貞姬葛宇川（石河子大學水利建筑工程學院，石河子832000）摘要：為分析網(wǎng)式過濾器濾網(wǎng)堵塞的過程和成因，并獲得濾網(wǎng)堵塞后壓降計算的相關(guān)參數(shù)，對網(wǎng)式過濾器進行堵塞試驗。試驗結(jié)果表明：濾網(wǎng)堵塞經(jīng)歷了介質(zhì)堵塞和濾餅堵塞2個過程，形成的濾餅內(nèi)層泥沙顆粒粒徑
2、較大，外層顆粒粒徑分布較均勻；濾網(wǎng)孔徑和含沙量是影響堵塞的重要因素，濾網(wǎng)孔徑越高，濾網(wǎng)堵塞所用時間越短；相同孔徑下，含沙量越大，堵塞所用時間越短，濾網(wǎng)越容易堵塞。根據(jù)試驗結(jié)果建立了濾網(wǎng)內(nèi)外壓降與濾網(wǎng)孔徑、濾網(wǎng)厚度、孔隙率、形成濾餅層厚度、濾餅孔隙率等的定量關(guān)系式，并分別計算了孔徑為430、280、200?m的濾網(wǎng)內(nèi)外壓降，并與實測壓降進行了對比分析。結(jié)果表明，計算得到的濾網(wǎng)內(nèi)外壓降與實測值基本一致，可以反映濾網(wǎng)堵塞的規(guī)律；濾網(wǎng)內(nèi)外壓降隨水流流量、濾網(wǎng)厚度、形成濾餅層厚度增大而增大，濾網(wǎng)的孔徑越小，濾
3、餅孔隙率越小，濾網(wǎng)兩側(cè)壓降越大。關(guān)鍵詞：網(wǎng)式過濾器；濾網(wǎng)；堵塞成因；濾餅；壓降中圖分類號：TV131.4；S277.9+5文獻標識碼：A文章編號：CloggingReasonAnalysisandPressureDropCalculationofScreenFilterZONGQuanliYANGHongfeiLIUZhenjiGEYuchuan(CollegeofWaterConservancyandArchitecturalEngineering,ShiheziUnivercity,Shihez
4、i832000,China)Abstract：Filtrationisessentialtotheefficientoperationofdripirrigationsystemsandscreenfilteristhemostcommontypesoffilterusedindripirrigationsystems.Thescreenoffiltercouldbecloggedbysandparticleswhichcan’tpassthroughthefiltermeshporeinthepr
5、ocessoffiltering.Thecloggingexperimentwascarriedouttoanalyzetheprocessandreasonofscreenclogging,andobtainsomeparametersofcalculatingthepressuredropofscreenfilterafterbeingclogged.Accordingtoexperimentalresults,thecloggingreasonwasanalyzedbythemediumclo
6、ggingandfiltrationcakeclogging,respectively.Thesizesofsandparticlesininnerlayeroffiltrationcakearelargeandthesizesintheouterlayeraresmallanduniform.Withthelargesizeofmeshpore,thetimeofscreencloggingisshortandthescreenwaseasytobeclogged.Underthesamesize
7、ofmeshpore,thetimeofscreencloggingwillbeshortenwithlargesandconcentration.BasedonDarcy’sLawandactualparametersofscreen,therelationshipbetweenpressuredropofscreenandthemeshpore,meshthickness,meshporosity,filtrationcakethickness,filtrationcakeporositywas
8、developedtheoretically.Accordingtotheactualdataofthefiltrationmeshandcake,thepressuredropsbetweentheinternalandexternalsurfaceofscreenwerecalculatedwiththemesh?收稿日期：2017-01-02修回日期：2017-02-23基金項目：國家自然科學基金項目（11662018）作者簡介：宗全利（1979-），男，教授，
