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1、機(jī)械設(shè)計(jì)與制造第l2期166MachineryDesign&Manufacture2014年12月汽輪機(jī)側(cè)齒汽封與梳齒汽封流動(dòng)特性研究盛偉,李子超,肖增弘,孟召軍(1.沈陽(yáng)工程學(xué)院研究生部,遼寧沈陽(yáng)110136;2.沈陽(yáng)工程學(xué)院能源與動(dòng)力學(xué)院,遼寧沈陽(yáng)110136)摘要:對(duì)汽輪機(jī)上側(cè)齒汽封和梳齒汽封進(jìn)行建模,基于數(shù)值求解方法,用有限體積法對(duì)控制方程進(jìn)行離散,并求解湍流模型的封閉方程組,在不同的進(jìn)口壓力下,分析了側(cè)齒汽封和梳齒汽封的三維流動(dòng)特性。分析結(jié)果表明側(cè)齒汽封并不一定優(yōu)于梳齒汽封,對(duì)于高低齒形式的汽封,梳齒汽封的密封性能較好,泄漏量較少,對(duì)于平齒形式的汽封,側(cè)齒汽
2、封的密封性能較好,泄漏量較少,轉(zhuǎn)子的凸臺(tái)對(duì)汽封泄漏量的影響很大。為汽封齒的設(shè)計(jì)加工提供了理論依據(jù),為汽輪機(jī)的汽封改造提供了技術(shù)參考。關(guān)鍵詞:側(cè)齒汽封;梳齒汽封;流動(dòng)特性;泄漏量;數(shù)值模擬中圖分類(lèi)號(hào):TH16;TH136文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1001—3997(2014)12—0166—03TheStudyontheFlowCharacteristicsfortheLateralToothSteamSealandtheComb-TypeSteamSealintheSteamTurbineSHENGWei,LIZi-chao。,XIAOZeng-hong,MENGZha
3、o~un(1.GraduateSchool,ShenyangInstituteofEngineering,LiaoningShenyang110136,China;2.SchoolofEnergyandPowerEngineering,ShenyangInstituteofEngineering,LiaoningShenyang110136,China)Abstract:Thelateraltoothsteamse01modeZandthecomb-typesteamsemodeZinsteamturbinewerebuild.Thenumeric01methodWa
4、sused.ThenitevolumemethodWaSusedtOdiscretizecontrolequationandⅡclosed-,0rmequationsystemofturbulentModelsolvedThree--dimensionalflowcharacteristicsofthelater01toothsteamsealandthecomb-typesteamsealwereinvestigatedunderdifferentinletpressure.Theobtainedresultsdemonstratethatthelater01too
5、thsteamse01mriotbebetterthanthecomb-typesteamseaLThecomb-typesteamsealisbetterthanthelater01toothsteamsealinsteppedsealandtheleakageflowrateofthecomb-typesteamsealislower.Thelateraltoothsteamsealisbetterthanthelater01toothsteamsealinflatsealandtheleakageflowrateofthelater01toothsteamsea
6、lislower.Thebosshasangreatefectontheleakageflowrate.ThestudyCanbeabletosupplytheoreticalfoundationforthedesignofsteamsealandtechnicalsupportforsealtransformation.KeyWords:LateralToothSteamSeal;Comb-1rypeSteamSeal;FlowCharacteristics;LeakageRate;NumericalSimulation1引言隨斜齒傾斜角的變化規(guī)律。采用數(shù)值模擬的方
7、法,研究了高低形側(cè)齒汽封與高低形梳齒汽封的流動(dòng)特陛,同時(shí)研究了平齒形側(cè)齒汽封隨著能源短缺的日益嚴(yán)重,節(jié)能降耗已經(jīng)成為一項(xiàng)迫切任與平齒形梳齒汽封的流動(dòng)杼眭,得出側(cè)齒汽封不是在任何條件下務(wù),火力發(fā)電廠(chǎng)每年的耗煤量占全國(guó)每年耗煤量的60%以上,而都優(yōu)于梳齒汽封,而是需要滿(mǎn)足一定的條件,為汽封齒的設(shè)計(jì)加汽輪機(jī)的效率相對(duì)較低,因此,提高汽輪機(jī)的經(jīng)濟(jì)f生是節(jié)能降耗的工和電廠(chǎng)汽封改造提供了理論依據(jù)和技術(shù)支撐。有效途徑陽(yáng)。汽輪機(jī)是電廠(chǎng)中的大型旋轉(zhuǎn)機(jī)械,動(dòng)靜部件之間需要有密封裝置,密封性能的好壞直接關(guān)系到汽輪機(jī)的經(jīng)濟(jì)性。汽輪機(jī)2數(shù)值分析模型密封形式多種多樣。梳齒汽封因