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1、第4O卷第4期蘭州理工大學(xué)學(xué)報(bào)Vo1．40No．42014年8月Journ~ofLanzhouUniversityofTechnologyAug．2014文章編號(hào)：1673-5196(2014)04-0051-O5單一雙蝸殼泵隔舌區(qū)壓力脈動(dòng)及徑向力特性分析劉宜，梁潤東，蔣躍，郭苗(蘭州理工大學(xué)能源與動(dòng)力工程學(xué)院，甘肅蘭州730050)摘要：為揭示單一雙蝸殼離心泵的不同水力特性，應(yīng)用商業(yè)軟件FLUENT，采用RNGk-e湍流模型和滑移網(wǎng)格技術(shù)，對(duì)單一雙蝸殼雙吸離心泵進(jìn)行不同工況下三維非定常湍流數(shù)值模擬，得到不同蝸殼隔舌區(qū)計(jì)算點(diǎn)的壓力脈動(dòng)情況，并對(duì)其進(jìn)行頻域
2、分析．結(jié)果表明：?jiǎn)挝仛るx心泵在設(shè)計(jì)工況及大流量工況下，壓力脈動(dòng)頻率以葉片通過頻率為主；在小流量工況下，壓力脈動(dòng)頻率以低于1倍葉片通過頻率為主，在0．6倍設(shè)計(jì)流量工況下，其壓力脈動(dòng)最大幅值約為設(shè)計(jì)工況下1．13倍．雙蝸殼離心泵在小流量、設(shè)計(jì)流量及大流量工況下，壓力脈動(dòng)頻率均以葉片通過頻率為主，在0．6、0．8和1．2倍設(shè)計(jì)工況下，其壓力脈動(dòng)最大幅值分別約為設(shè)計(jì)工況的6．59、3．12和4．55倍．相比較于單蝸殼泵，雙蝸殼泵能有效地平衡徑向力，在偏離設(shè)計(jì)工況下徑向力變化不大．關(guān)鍵詞：雙吸離心泵；單蝸殼；雙蝸殼；壓力脈動(dòng)；徑向力·中圖分類號(hào)：TH311文獻(xiàn)標(biāo)識(shí)
3、碼：APressurefluctuationnearvolutetongueandanalysisofradialforcecharacteristicsofsingleanddoublevolutepumpsLIUYi，IAANGRun-dong，JIANGYue，GUOMiao(CollegeofEnergyandPowerEn~gineefing，LanzhouUniv．ofTeeh．，Lanzhou730050，China)Abstract：Inordertorevealthedifferenceofhydrauliccharacteristic
4、sbetweensingleanddoublevolutecentrifugalpumps，theirthree-dimensionalnon-stationaryturbulentflowwasnumericallysimulatedwithcommercia1softwareFLUENT。RNGturbulencemodel，andslidingmeshtechnologyunderdifferentoperationalconditions．Thepressurefluctuationnearvolutetonguewasobtainedandth
5、efrequencyspectraatcorrespondingmonitoringpointfordifferentvoluteswereanalyzed．Theresultsshowedthatthebladepassingfrequencydominatedthepressurefluctuationsnearthevolutetongueunderdesignandlargeflowrateconditionforsinglevolutecentrifugalpump．Undersmallflowratecondition，thefrequenc
6、ylessthanthebladepassingfrequencybecamedominativeinthepressurefluctuations．Underconditionof60de—signflowrate，themaximumpressurefluctuationamplitudewasabout1．13timeslargertitantheampli—tudeatdesignflowrate．Forthedoublevolutepumpthebladepassingfrequencydominatedthepressurefluctuati
7、onsnearthevolutetongueunderconditionsofdesignandoff-designflowrate．Underconditionsof60，8Oand120designflowrate，thepressurefluctuationamplitudeswererespectively6．59，3．12and4．55timeslargerthantheamplitudeatdesignflowrate．Comparedwiththesinglevolutepump，thedoublevolutepumpexhibitedth
8、eabilitytobalanceeffectivelytheradialfor
