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1、振動與沖擊第33卷第11期JOURNALOFVIBRATIONANDSHOCKV01．33No．112014離心泵蝸殼內(nèi)非定常流動特性王松林，譚磊，zZ)~l(1．華北水利水電大學(xué)水利學(xué)院，鄭州450011；2．清華大學(xué)水沙科學(xué)與水利水電工程國家重點實驗室，北京100084)摘要：基于修正的RNGk—湍流模型和輸運方程空化模型，對離心泵內(nèi)部非空化和空化的非定常流動進行了數(shù)值模擬，計算結(jié)果與試驗結(jié)果吻合較好，驗證了數(shù)值模型和計算方法的準(zhǔn)確性。在離心泵蝸殼內(nèi)布置了5個監(jiān)測點，分析了蝸殼內(nèi)非空化和空化工況時流動特性。結(jié)果表明：離心泵非空化和臨界空
2、化工況下，蝸殼內(nèi)壓力脈動的主頻為葉片通過頻率145Hz或290Hz，而在充分發(fā)展空化工況下，壓力脈動的主頻非常低，可能原因是空泡劇烈的脫落及潰滅引起的。三種工況下，離心泵蝸殼第2斷面附近的壓力脈動最大幅值均遠大于其它監(jiān)測點，原因是此處存在較強的二次流，出現(xiàn)了兩個非對稱反向旋渦，兩個旋渦的渦心位置、形狀、強度隨時問不斷變化，對流動產(chǎn)生較強擾動，誘發(fā)強烈的壓力脈動。關(guān)鍵詞：離心泵；蝸殼；非定常；流動特性中圖分類號：TH311文獻標(biāo)志碼：ADOI：tO．13465／j．cnki．jVS．2014．11．008Characteristicsofun
3、steadyflowinacentrifugalpumpvoluteWANGSong—lin，TANLei，WANGYu—chuan(1．SchoolofWaterConservancy，NorthChinaUniversityofWaterResourceandElectricPower，Zhengzhou450011，China；2．StateKeyLaboratoryofHydroscienceandEngineering，TsinghuaUniversity，Beijing100084，China)Abstract：Theunste
4、adyflowinacentrifugalpumpwasnumericallysimulatedbyusingcombinationofthemodifiedRNG一turbulencemodelandthetransportequationcavitationmode1．Theagreementbetweentheexperimentalresultsandthesimulationoneswassatisfactory，itdemonstratedthatthenumericalmodelandthecalculationmethods
5、canbeusedtoaccuratelypredictthecavitationflowinacentrifugalpump．Theflowcharacteristicsinacentrifugalpumpvolutewithoutandwithcavitationwereanalyzedbysetting5monitoringpointsinthevolute．Itwasshownthatthedominantfrequenciesofpressurefluctuationinthevoluteatoperatingconditions
6、ofnon—cavitationandcriticalcavitationarethebladepassfrequencyof145Hzor290Hz；however，thedominantfrequencyofpressurefluctuationatthedevelopedcavitationconditionisverylowduetotheviolentsheddingandcollapseofbubblesinthepump；forthreeoperatingconditions，themaximumamplitudeofpres
7、surefluctuationatthesecondsectionofthevoluteismuchlargerthanthoseatothersections，thepossiblereasonisthatthereisastrongsecondflownearthissectioninducedbyapairofcounter-rotatingvortex；thelocation，shapeandstrengthofthevortexarechangingwithtime，thischangingvortexdisturbstheflo
8、winthesecondsectionandleadstostrongpressurefluctuations．Keywords：centrifugalpump；volute；u
