汽轮机组微波谐振腔湿度测量方法实验研究

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1、华北电力大学（保定）博士学位论文汽轮机组微波谐振腔湿度测量方法实验研究姓名：田松峰申请学位级别：博士专业：热能工程指导教师：杨昆20090101华北电力大学博士学位论文摘要。AbstractInlargepowerplant，wetsteaminturbineandwaterinturbineoilandwethydrogennhydrogen-cooledgeneratorwilldecreasesafetyandeconomicofturbinegeneratingunit．Thelastseveralstageofcondensingsteamtu

2、rbine，thepresenceofwetsteamleadstoproblemsofbladeerosionandlossesinturbineefficiency．Hi曲levelwaterratiointurbineoilwouldintroducetheoildemulsibilityreduced，andthenthelubricationperformanceandstablethickoilfilmCan’tbeformed．Theabnormalwearofjournalandbear,burningtileand抱瓦wouldoccu

3、r．Highwetnessinhydrogenofhydrogen—cooledgeneratorwouldintroducecorrosionofgeneratorstatorinsulationandmetalstructures．Evencausemajoraccidentsuchasgroundingandinterphaseshortcircuit．Sotheaccuratemeasurementofsteamwetnessandwaterratioandwetnessinhydrogenisaimportantresearchdirectio

4、nwhichcanprovideguidingforsafeandeconomicoperationofunit．Wetnessmeasurementbythemethodofmicrowaveresonantcavityperturbationisstudiedinthepaper．Researchisfocusedondetectiontechniqueandexperimentalstudyforturbineexhaustwetnessandwaterrationinturbineoilandwetnessinhydrogenofhydrogen

5、-cooledgenerator．ThedielectriccharacteristicsofturbineexhaustandturbineoilwithwaterandwethydrogenisstudiedTheexpressionofrelationshipbetweenaquifermediumeffectivepermittivityandmediumwetnessiSderived．Ametllodofwetnessmeasurementbasedonmicrowaveresonatorperturbationispresented．The

6、measurementmethodprincipleisdescribed，andthecoincidedresonatortypeandworkingmodefordifferentwetnessisdetermined，andtherelationshipbetweenfrequencyoffsetinresonatorwithchosenworkingmodeandmediumwetnessisderived．Keyproblemsofthismeasurementtechnologyinthemicrowaveresonantcavitypert

7、urbationmethodimplementationandmeasurementdevicedevelopmentarestudied．Whendesigningthemicrowaveresonatorperturbation，theworkingfrequencyisdeterminedbasedontherelationshipbetweendifferentwavelengthandwaterdielectricconstantandtheresonatorpropersizeaccordingtotheworkingwavelength．A

8、sthesensorofmeasurementdevice，theresonat