喷注噪声抑制技术研究

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1、上海交通大学硕士学位论文喷注噪声抑制技术研究姓名：黄磊申请学位级别：硕士专业：机械设计及理论指导教师：蒋伟康20090201上海交通大学硕士论文摘要喷气器的计算模型，通过改变喷孔参数来计算分析压力场和速度场，并最终以实验来验证改进喷嘴的降噪性能。最后，对新型喷嘴在钢铁工业中的应用进行说明。针对生产工况下粒化钢渣时发出的强噪声进行分析研究，找出噪声源，并确定治理方案，通过现场测试对比新旧喷嘴在不同工况下噪声级的差别，验证新型喷嘴的降噪性能。关键词：喷注噪声；喷嘴参数；湍流声辐射；流场分析；IV上海交通大学硕士论文ABSTRACTResearchonJetNoiseReducti

2、onABSTRACTJetnoiseisverycommon,anditisthemostimportantsourceofenvironmentalpollution.Withthedevelopmentofmodernindustry,aerodynamicalnoiseisusuallyhigherthanthemechanicalnoisewithwiderangeandheavydamage.Mostexhaustingequipmentinindustrysuchashigh-pressurenozzleusedinprocessingthesteelslagwi

3、llproducethestrongnoiseof120dBorabove.Thiswillseriouslypollutetheworkingenvironmentofworkshopandmakenegativeeffectonthehealthandworkefficiencyofworkers.Therefore,toresearchthemechanismandcharacterofthejetnoiseandtograspthedisciplineisverymeaningfultoinhibittheinterferenceandhazardofthenoise

4、.CombinedwiththeprojectofnoisereductioninMasteel,thisthesisisbaseonthetheoreticalanalysisandtheformerexperience.Besidesthat,thethesisisfocusedontheresearchoftechnologyininhibitingthejetnoiseandimprovementofthenozzle,bythemeansofcomputationsimulationandexperimentalanalysis.Thisthesisiscompos

5、edof4mainparts:V上海交通大学硕士论文ABSTRACTFirstly,predictingthejetnoisebyconcludingthecharacter,mechanismandaseriesofexperiencedformula.Secondly,analyzingtheturbulentnoisecausedbytheflowturbulencefromtheturbulentsonicradiationtheory;calculatingthebestmodelofjetflowbycomparingdifferentturbulentmodel

6、sbythemeanshydrodynamics.Thirdly,establishingthecomputationmodelofjetnoisebasedonthejetflowanalysisandhydrodynamics;improvingthenozzlebychangingtheparametersofnozzlewhichresultsinthechangeofpressureandvelocityflow;verifyingtheresultbyexperiment.Atlast,elaboratingtheapplicationofthenewnozzle

7、inindustry;identifyingthesourceofnoiseandmakingouttheproject;comparingtheimprovednozzlewiththeoldnozzletotestifythefunctioninnoisereduction.Keywords:Jetnoise;Parametersofnozzle;Analysisofflowfield;TurbulencesonicradiationVI上海交通大学硕士论文主要符号说明主要符号说明c声速ms/3ρ密