湍流混合層中粒子擴(kuò)散的實(shí)驗(yàn)研究.pdf

1、浙江大學(xué)碩士學(xué)位論文湍流混合層中粒子擴(kuò)散的實(shí)驗(yàn)研究姓名：劉志華申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：流體機(jī)械及工程指導(dǎo)教師：林建忠李玉麟2001.3.1塑婆查蘭堡主堂堡堡塞————一ABSTRACTResearchresultsconcerningthedispersionofparticlesintwo—phaseflowarereviewedThedispersionofsolidparticlesinaturbulentshearlayerha

2、sbeeninvestigatedexperimentallytOclarifythedominantfactorswhichgoverntheparticlemotioninturbulentwaterflowSphericalparticleswereloadedattheoriginofatwodimensionalmixinglayerFlowmeasurementswerecarriedoutbyaLaserDoppleran

3、emometer(LDA)whichenabledthemeasurement0fbothparticleandwaterphasevelocities，atthesametimetwo—phaseflowfieldweremeasuredbyParticleImageVelocimetry(PlV)Rawdataandflowmap0ftwo—phasewereobtainedS0turbulencenumberanduV—corre

4、lationwerecalculatedandcomparedAfteranalysistheconclusionsareasfollows：Theparticledispersionstronglydependedontheparticles’sizeandtheresponsetimetotheflowfieldaround，theStokesnumberistherealcontrolparameterinmixinglayerT

5、heparticleswithsmallerStokesnumbermovealongthestreamlineofeddystructureTherangeoIStvaluescoveredinthepresentstudy，thedegree0ftheparticledispersionincreasesalongwiththeenlargementofStvalueCoherentstructuredeterminethedisp