海水卤水太阳池热性能研究和梯度层动力稳定性分析

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1、大连理工大学博士学位论文海水-卤水太阳池热性能研究和梯度层动力稳定性分析姓名：王华申请学位级别：博士专业：工程热物理指导教师：孙文策20080901海水．卤水太同I池热性能研究军

2、l梯度层动力稳定性分析盐梯度层的非线性稳定性问题不能够采用分析的方法求解，根据变步长四阶Runge．Kutta-Merson方法进行非线性稳定性分析，二维温度、盐度和速度场表明线性分析得到的临界稳定性瑞利数(舷‘)能够很好地界定了系统的渐进稳定性状态。根据Nusselt数确定的临界稳定性瑞利数R口N略大于线性稳定性分析得到的临界瑞利数砌c，当盐瑞利数

3、凡在10s和106数量级上，砌N与砌。的差距仅为1％左右。关键词：盐梯度太阳池；实验；数值模拟；非线性稳定性人连理：j：火学博七学位论文ThermalPerformanceStudyOHSeawater-bitternSolarPondandDynamicStabilityAnalysisonNCZAbstract，nIeneedforenergyisincreasingsharplyowingtotherapidincreaseintheworld’Spopulationanddevelopingtechnologies．S

4、olarenergyisoneofthemostimportantenergysources．Salt—GradientSolarPondiSasalt-waterpond，whichiScapabaleofbothabsorptionandstoragesolarenergy．Itisnotolnythecomplementaryofthetranditionalenergycurrently，butalsooneofthemainenergysourcccsinthefuture．nepaperfocusedontheth

5、ermalperformanceofsaltgradientsolarpondbothexperimentallyandnumerically．Themainworksandconclusionsaresummall。edasfollows：Asolarpondwithsurfaceareaof2．8x2．3mzanddepthof0．8mwasconstructed．Aseriesofsmall-scalelaboratoryandoutdoorexperimentswerecarriedout．Thefirstexperi

6、mentinthesolarpondwasstartedinAugust2006．nemaximumtemperatueis45．7℃onthe17thday．Comparetotheanalogicalexperiment，thisexperimentalsolarpondhasfavorablethermalperformance．Inthispaper，thesolarpondwasfilledwithbitternandseawater,inordertoinvestigatetheturbidityevolution

7、inthebitternfilledsolarpond,twolaborlatoryexperimentswerecarriedout，oneisfortheregrowthoftheaegalinthetreatedbittern，andanotheriSfortheturbidityvariationinbitternandsaltwaterafterrainfall．Theresultsshowsthatitcontrolsthegrowingofthebittern’Salgaetosomeextendbyusingf

8、locculantstoreducetheturbidityofthebitten，butaftersometime，itispossiblethatthealgaemaygreatlypropagate，andtheturbidityofthesolarpondgreatlyincreases；thedustcansubsidequicklywhenitfallsinthepuresaltpond，butitsubsidesslowerinbitternpond，SOthewaterofbitterncan’tbeclari

9、fiedeasily．InordertocnhanceLCZtemperature，accordingtoaseriesofsmall．scaleexperiments,anovelandfeasiblemethodtoincreaseLCZtemperatureofsola