The Torsional Vibration of Turbo Axis Induced by Unsteady Aerodynamic Force on Rotor blade

INTRoDUCTIONThestructuralfailureofturbotalsbytorsionalvibrationisoneofthemostimPortantproblemsthect-ingthesafetyoftheturbomachineryoperation-Inthepasttime,researchesonthecauseofthetorsionalvibrationofturboaxishavebeenfocusedonelectricalandmechanicalfields(D.Lambrecht,1982.H.DikenandI.G.Tadjbakhsh,1989.IEEEWorkingGroupInterimReport,l982).Butasafluidmachinerystea-mturbinemayexperienceintensetorsionalvibrationin-ducedbyfluid.Thisphenomenonissimilartotheflutterinsofarasbothoftheminvolve…     

Average Droplet Diameter Measurement and Results for Fuel Aerosol Injected by Certain Types of the Turbojet Burners

INTRODUCTIONMeasurementofthedropletdiameteroffuelaerosolisverydifficult,becauseofthefastchangeofitssize,whichiscausedbyevaporationandassociation.Itisalsoverydifficulttogetaknowledgeofaerosolstreamsinthecourseofconstructionofnewtypeoffuelburn-ersanddiagnosticprocessaswell.Diffractionmethodisoneofthemostusefulmea-suringproceduresinthiscase.Thedropletsizeofmonodispersivemediumiseasytorecognise.Analy-sisofadiffeactionpatternofpolydispersivemediumisconsiderablymoredifficult.Thisworkpresentsam…     

Determination of Effective Thermal Conductivity ForReal Porous Media Using Fractal Theory

INTRODUCTIONPorousmediaisacompositemediathatincludessolidframeandfluidandexistedwidelyintheeajrthbiosphere.Heatandmasstransferinporousmediaisbothanaturalphenomenoninearthbiosphereandaphysicalchemistryprocessinindustries,agricultureandhumanlife.Thusthestudyonheatandmasstransferinporousmediahasbecomeanimportanttasktoscielltistsandengineers.Heatandmasstransferinporousmediaisaverycomplexobject.Therearestillmanydifficultiestodescribethecoupledheatandmasstransferphenomena.Amongthesedifficultie…     

Analysis of Evaporation Heat Transfer of Thin Liquid Film in a Capillary of Equilateral Triangular Cross—Section

IntroductionThe study on evaPoration heat transfer in caPillmpbodies is imPOrtant for design and development of higIilyefficient heat transfer equipment, such as heat pipe. P.C.W and Y.K. Kao[i] stUdied the interline heattransfer coefficients of an evaPorating wetting film.L.SoloVyev and S.A. KovalevI2l discussed the mechAnsmabout evaPoration of a liquld film from a porous sdse.A. Schonberg and P.C. Wayner['l developed Shae's(l953)['l evaPoration heat transfer model that based ontem…     

几种参考文献的书写格式

(其中空格、标点符号、字母照写)连续出版物:[标引序号]作者.文题[J].刊名,年,卷(期):起始页码-终止页码.专著:[标引序号]作者.书名[M].出版地:出版者,出版年.译著:[标引序号]作者.书名[M].译者.出版地:出版者,出版年.论文集:[标引序号]作者.文题[A].编者.文集[C].出版地:出版者,出版年.起始-终止页码.     

参考文献格式要求

正1.参考文献按正文部分标注的序号依次列出,并在序号中加[]。2.对于常见的各类参考文献标注方法如下:1)著作:作者姓名,题名[M].出版地:出版者,出版年.2)期刊论文:作者姓名.题名[J].期刊名称,年,卷(期):页码.3)会议论文集:作者姓名.题名[C]//论文集名称,会议地点,会议日期.4)学位论文:作者姓名.题名[D].出版地:出版者,出版年.5)专利文献:专利申请者或所有者姓名.专利题名.专利国别.专利号[P].公告日期或公开日期.获取路径.6)电子文献:作者姓名.题名[文献类型标志(含文献载体标志)见其它].出版地:出版者,出版年(更新或修改日期),获取路径.7)报告:作者姓名.题名[R].出版地:出版者,出版年.     

近期地热文摘

D84710 扩充地热规划（ Geothermal ProjectOutreach, Laurie Maclenahan and Curtis Williams, GRC Bulletin, Vol. 34. No. 1. Jan./Feb.2005,23-26 ）；D84711 50年地热生涯谈勘探（A Strange Brecd of Cat, Carl F. Austin, GRC Bulletin, Vol.34 ,No. 1 ,Jan./Feb. 2005,27-29 ）；D84712 示踪剂试验分析的系统方法（A Systematic Method An Alternative Tracer Test Analysis Using Beowawe Data, G. Michael Shook,GRC Bulletion, Vol. 34. No. 1. Jan./Feb. 2005,31-35 ）；D84713可再生能源能帮助重建天然气市场平衡吗？（ Can Renewable Energy Help？ Restoring Equilibrium to Natural Gas Markets, Ryan Wiser and Mark Bolinger, GRC Bulletin, Vol. 34.No. 1 Jan./Feb. 2005,37-39 ）；D84714 注入低温流体诱发的热弹性提高与破碎渗透性的效果及其实验室验证（Thermoelastically-induced Fracture Permeability Enhance-ment Associated With Cold Fluid Injection andits Laboratory Verification, 伊藤高敏、渡边恒、Daniel Swenson、林一夫，日本地热学会蒜。Vol．27．No．2（2005），101—113）；……     

提升反应温度对微尺度火焰稳定性的改善

本实验对微尺度燃烧器内部使用电热丝向反应物加热,提高其温度,减少散热影响,从而实现微尺度火焰稳燃.燃烧器为石英直圆管,长82.mm,通流面积3.33.mm2.氢气/空气混合气体流量为0.12.L/min、0.2.L/min、0.4.L/min,电热功率分别为0.W、1.05.W4、.70.W.实验结果显示,提高电热功率抑制熄火;提升燃料混合气体总流量也有助于抑制熄火;但高流量同时带来吹脱问题.测量燃烧器壁面温度,结合数值模拟研究内部燃烧过程.结果显示,随电热功率上升,反应温度和OH质量分数上升,证明电加热强化反应,抑制了热熄火.比较壁面散热,电热功率0.W,流量由0.12.L/min上升到0.2.L/min时,壁面散热占总能量份额由84.8%降低至81.1%.因此,在一定范围内提升燃料流量亦可抑制热熄火.     

铝活塞耐磨镶圈(续篇Ⅱ)

2　耐磨镶圈的设计2 1　单环槽耐磨镶圈的设计(如表1)表1活塞直径(mm)活塞环高度(mm)<2 .5 >2 .5～4.0 >4.0～5 .0 >5 .0～6.5<12 5<12 5 ,<15 02 .02 .5 52 .5 53 .23 .24.04.05 .1C .环槽最大深度K .环槽最大宽度(梯形环槽时取最大值)B .环槽后面厚度,一般取0 .5C ,但最小不得小于2 1mmT .环岸宽度,根据活塞直径及环槽宽度决定A .活塞环岸直径加7.5mmE .台阶直径,A -4 .5 7mmF .耐磨镶圈内径D -2B -2Cα.斜面角度,3°3 0′或7°3 0′G .计算得出H .定位台阶宽度1/ 2 (K +T +T) ,最小2mmR .圆弧角半径,根据环槽后面厚度决定,从2 …     

Experimental Study and Modelling of Char Combustion under Fluidized Bed Conditions

INTRODUCTIONMailyexperimentshavebeendonetostudytheconversionbehaviorofdifferentcoalsundervariousreactorsandconditions.Someauthorshaveproposeddetailedmodelsfromobservedresults,orfromthealreticalaspects.Twotypemodelsaredevelopedtopredicttheconcelltrationprofilesforthegaseousspeciesaroundaburningcharparticled].In'single--film'models,thecarbonreactdirectlywithoxygentoformCOorCOb.In'double--film'modelsitisassumedthattheoxygendiffusingtowardsthepaxticleisconsumedbeforeitreachesthesuxface.Thep…