旋流型熱聲不穩(wěn)定特性及其控制的試驗(yàn)研究.pdf

1、浙江大學(xué)機(jī)械與能源工程學(xué)院碩士學(xué)位論文旋流型熱聲不穩(wěn)定特性及其控制的試驗(yàn)研究姓名：李時(shí)宇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：熱能工程指導(dǎo)教師：周昊20080501浙江大學(xué)碩士學(xué)位論文摘要AbstractWiththeimprovementofenvironmentalrequirements1eanpremixedcombustiongasturbineshasbeenwidelyusedinindustryMeanwhilethermoacous

2、ticinstabilityfrequentlyOCCUrsinthegasturbinesLarge—amplitudethermoacousticinstabilitynotonlyreducetheperformanceofgasturbines，butalsoincreasetheNOxemissionsEvenlythermoacousticinstabilitycouldcausestructuredamagetogastu

3、rbinesAexperimentalstudyofthermoacousticinstabilityandpassivecontrolofthermoacousticinstabilityinaswirlcombustorWasdescribedinthisthesisFirstweclarifiedthethermoacousticphenomenonandthermoacoustictheory，meanwhilewereview

4、thestudyoncontrolofthermoacousticoscillationThenintroducethemechanismofcontrolofthermoacousticoscillationThroughasimplemodewedescribethemethodsofcontrolofthermaxousticoscillationAfterwesummarizedthestudyonswirlcombustion

5、，wedesignedandbuiltaswirlcombustionthermacousticinstabilityexperimentalsetup，includingtheswirlcombustor，fuelcontrolsystem，temperaturemeasurementsystemandpressuremeasurementsystemThecharacteristicsofthermoacousticinstabil

6、ityinswirlcombustionWasstudiedonthesetupWemeasuredthetemperatureandpressureofthermacousticoscillationatdifferentchemicalratesandswirlintensityAndstudiedvarietyoftemperature，pressureandfrequencyofthermoacousticoscillation

7、asthechangeofchemicalratesorswirlintensityWefoundthatchemicalratesandswirlintensitygreatlyaffectsthetemperatureinswirlcombustorandtheamplitudeofthermoacousticoscillation，alsoinfluencesthefirstmodefrequencyofthemaocoustic

8、oscillationWhilethesecondandthethirdmodefrequencychangedalittleWeprogressedapassivecontrolofthermoacousticinstabilityinswirlcombustorwithacentraljetWefoundthatcentraljethasgreatimpactsonthedynamicsofcentralrecirculationz