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时间:2020-03-28
《大型可倾瓦轴承瓦块数目对轴承静动特性的影响分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第58卷第4期汽轮机技术Vol.58No.42016年8月TURBINETECHNOLOGYAug.2016大型可倾瓦轴承瓦块数目对轴承静动特性的影响分析1213席文奎,冯永志,魏航信,武通海(1西安石油大学机械工程学院,西安710065;2哈尔滨汽轮机厂有限责任公司,哈尔滨150046;3西安交通大学现代设计与转子轴承系统教育部重点实验室,西安710049)摘要:借鉴国内外大型可倾瓦轴承设计技术特点,围绕实际大型可倾瓦轴承设计过程中急需解决的轴承温升、承载力与稳定性的设计难点与耦合问题,采用流固热耦合模型和多场分析技术,对不同瓦块数目变化下可倾瓦轴承的温度场、压力场、最小油膜厚度
2、以及刚度、阻尼等静动特性进行计算分析,结果表明:块数目增加,可倾瓦轴承最大油膜压力和最高温度略有增加,最小有油膜厚度明显减小,导致轴承承载能力明显下降,但轴承刚度、阻尼明显增大,这对提高稳定性有利,实际中可倾瓦轴承瓦块数目的确定应根据设计要求和工况条件进行具体分析。关键词:可倾瓦轴承;瓦块数目;温度;压力;油膜厚度;刚度;阻尼+分类号:TK263.64文献标识码:A文章编号:1001-5884(2016)04-0241-04TheInfluenceofTilting-PadNumberonStaticandDynamicCharactersofLargeScaleTilting-P
3、adBearing1213XIWen-kui,FENGYong-zhi,WEIHang-xin,WUTong-hai(1SchooloFMechanicalEngineering,Xi’anShiyouUniversity,Xi’an710065,China;2HarbinTurbineCompanyLimited,Harbin150046,China;3KeyLaboratoryofEducationMinistryforModernDesignandRotor-BearingSystem,Xi’anJiaotongUniversity,Xi’an710049,China)Abs
4、tract:Thetiltingpadbearingsarewidelyusedinmultiplefieldofhighparameterrotorsystemduetoitshighstability,adaptiveabilityforrotormisalignmentandloadchange.Owingtothedifferentapplicationfieldsandworkingconditions,themajorcompanieshaveformedrespectivetechnicalfeaturesinthecourseofthetiltingpadbeari
5、ngdesignandmanufacturingofhighpowerunits,whichmadethedifferencesofpad(Tilting-pad)numberandnounifiedqualitativeandquantitativeunderstandingofthelawinthisindustry.Inthispaper,theanalysisandcalculationofthetemperaturedistribution,thepressurefield,theminimumoilfilmthicknessandthestiffnessanddampi
6、ngofoilfilmoftiltingpadbearing,usingtheflowsolidheatcouplingmodelandmultifieldanalysistechniques,wascarriedoutunderthechangeinthenumberoftiles.Theresultsshowthatwiththeincreaseofthenumberoftiles,themaximumoilfilmpressureandthemaximumtemperatureoftiltingpadbearingincreasedslightly.Onthecontrary
7、,theminimumoilfilmthicknessdecreasessignificantly,whichresultsinthesignificantdecreaseofthebearingcapacityandthelargeincreaseofthebearingstiffnessanddampingofthebearing.Thatisfavorablefortheimprovementofthebearingstability.Itcanbealsoco
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