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1、上海交通大學(xué)碩士學(xué)位論文噴注噪聲抑制技術(shù)研究姓名：黃磊申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：機(jī)械設(shè)計(jì)及理論指導(dǎo)教師：蔣偉康20090201上海交通大學(xué)碩士論文摘要噴氣器的計(jì)算模型，通過(guò)改變噴孔參數(shù)來(lái)計(jì)算分析壓力場(chǎng)和速度場(chǎng)，并最終以實(shí)驗(yàn)來(lái)驗(yàn)證改進(jìn)噴嘴的降噪性能。最后，對(duì)新型噴嘴在鋼鐵工業(yè)中的應(yīng)用進(jìn)行說(shuō)明。針對(duì)生產(chǎn)工況下?；撛鼤r(shí)發(fā)出的強(qiáng)噪聲進(jìn)行分析研究，找出噪聲源，并確定治理方案，通過(guò)現(xiàn)場(chǎng)測(cè)試對(duì)比新舊噴嘴在不同工況下噪聲級(jí)的差別，驗(yàn)證新型噴嘴的降噪性能。關(guān)鍵詞：噴注噪聲；噴嘴參數(shù)；湍流聲輻射；流場(chǎng)分析；IV上海交通大學(xué)碩士論文ABSTRACTResearchonJetNoiseReducti
2、onABSTRACTJetnoiseisverycommon,anditisthemostimportantsourceofenvironmentalpollution.Withthedevelopmentofmodernindustry,aerodynamicalnoiseisusuallyhigherthanthemechanicalnoisewithwiderangeandheavydamage.Mostexhaustingequipmentinindustrysuchashigh-pressurenozzleusedinprocessingthesteelslagwi
3、llproducethestrongnoiseof120dBorabove.Thiswillseriouslypollutetheworkingenvironmentofworkshopandmakenegativeeffectonthehealthandworkefficiencyofworkers.Therefore,toresearchthemechanismandcharacterofthejetnoiseandtograspthedisciplineisverymeaningfultoinhibittheinterferenceandhazardofthenoise
4、.CombinedwiththeprojectofnoisereductioninMasteel,thisthesisisbaseonthetheoreticalanalysisandtheformerexperience.Besidesthat,thethesisisfocusedontheresearchoftechnologyininhibitingthejetnoiseandimprovementofthenozzle,bythemeansofcomputationsimulationandexperimentalanalysis.Thisthesisiscompos
5、edof4mainparts:V上海交通大學(xué)碩士論文ABSTRACTFirstly,predictingthejetnoisebyconcludingthecharacter,mechanismandaseriesofexperiencedformula.Secondly,analyzingtheturbulentnoisecausedbytheflowturbulencefromtheturbulentsonicradiationtheory;calculatingthebestmodelofjetflowbycomparingdifferentturbulentmodel
6、sbythemeanshydrodynamics.Thirdly,establishingthecomputationmodelofjetnoisebasedonthejetflowanalysisandhydrodynamics;improvingthenozzlebychangingtheparametersofnozzlewhichresultsinthechangeofpressureandvelocityflow;verifyingtheresultbyexperiment.Atlast,elaboratingtheapplicationofthenewnozzle
7、inindustry;identifyingthesourceofnoiseandmakingouttheproject;comparingtheimprovednozzlewiththeoldnozzletotestifythefunctioninnoisereduction.Keywords:Jetnoise;Parametersofnozzle;Analysisofflowfield;TurbulencesonicradiationVI上海交通大學(xué)碩士論文主要符號(hào)說(shuō)明主要符號(hào)說(shuō)明c聲速ms/3ρ密
