全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

汽轮机叶片表面粗糙度对自发凝结级性能影响的数值研究

DOI: 10.13334/j.0258-8013.pcsee.2015.21.017, PP. 5533-5541

Keywords: 汽轮机,叶片,自发凝结级,粗糙度,级效率,气动损失

Full-Text   Cite this paper   Add to My Lib

Abstract:

基于ANSYSCFX软件,分别采用单级和多级模型,研究了某1000MW火电汽轮机叶片表面粗糙度对自发凝结级级性能和叶栅通道内蒸汽自发凝结过程的影响。在所有计算中,忽略水滴沉积在叶片表面形成水膜的影响。计算结果表明:设计工况下,叶片表面的粗糙度将使级效率降低,且粗糙度越大,级效率下降数值也越大;静叶表面粗糙度对级效率的影响大于动叶表面粗糙度对级效率的影响;无论是静叶还是动叶,吸力面上粗糙度使级效率下降的数值都大约是压力面上粗糙度使级效率下降数值的4~5倍;粗糙度只影响其所在叶栅内的气动损失,而对上游和下游叶栅内气动损失影响很小;此外,叶片表面的粗糙度还将降低蒸汽在叶栅内的自发成核凝结程度,从而降低因自发凝结形成的水分。

References

[1]  Singh H,Rai L,Kale S R.A numerical study of the effect of roughness on the turbine blade cascade performance[J].Progress in Computational Fluid Dynamics,2008,8(7):439-446.
[2]  Bellucci J,Rubechini F,Maroncini M,et al.The Influence of roughness on a high-pressure steam turbine stage:an experimental and numerical study[C]//Proceedings of the ASME Turbo Expo 2014:Turbine Technical Conference and Exposition,GT2014-25540.Düsseldorf,Germany:ASME,2014.
[3]  Dai L P,Yu M Z,Dai Y P.Nozzle passage aerodynamic design to reduce solid particle erosion of a supercritical steam turbine control stage[J].Wear,2007,262(1-2):104-111.
[4]  Ahmad M,Casey M,Sürken N.Experimental assessment of droplet impact erosion resistance of steam turbine blade materials[J].Wear,2009,267(9-10):1605-1618.
[5]  Bons J P,Taylor R P,McClain S T,et al.The many faces of turbine suface roughness[J].Journal of Turbomachinery,2001,123(4):739-748.
[6]  Kind R J,Serjak P J,Abbott M W P.Measurements and prediction of the effects of surface roughness on profile losses and deviation in a turbine cascade[J].Journal of Turbomachinery,1998,120(1):20-27.
[7]  Yun Y II,Park Y II,Song S J.Performance degradation due to blade surface roughness in a single-stage axial turbine[J].Journal of Turbomachinery,2005,127(1):137-143.
[8]  张龙新,陈绍文,孙士珺,等.污垢沉积对某轴流压气机中间两级性能影响的数值研究[J].中国电机工程学报,2012,32(35):130-136 Zhang Longxin,Chen Shaowen,Sun Shijun,et al.Numerical study of on the impact of fouling on an axial compressor middle stages[J].Proceedings of the CSEE,2012,32(35):130-136(in Chinese).
[9]  张骏,袁奇,吴聪,等.大型风力机叶片表面粗糙度效应数值研究[J].中国电机工程学报,2014,34(20):3384-3391. Zhang Jun,Yuan Qi,Wu Cong,et al.Numerical simulation on the effect of surface roughness for large wind turbine blades[J].Proceedings of the CSEE,2014,34(20):3384-3391(in Chinese).
[10]  Samsher.Effects of localized roughness over reaction and impulse blades on loss coefficient[J].Proceedings of the Institution of Mechanical Engineers,Part A:Journal of Power and Energy,2007,221(1):21-32.
[11]  Leyzerovich A S.Wet-steam turbine for nuclear power plants[M].Tulsa:PennWell Corporation,2005:190-206.
[12]  Kreimeier F,Greim R,Congiu F,et al.Experimental and numerical analyses of relaxation processes in LP steam turbines[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2005,219(12):1411-1436.
[13]  Gerber A G,Kermani M J.A pressure based Eulerian-Eulerian multi-phase model for nonequilibrium condensation in transonic steam flow[J].International Journal of Heat and Mass Transfer,2004,47(10-11):2217-2231.
[14]  Yu X G,Xie D M,Wang C,et al.Numerical investigation of condensing flow in the last stage of low-pressure nuclear steam turbine[J].Nuclear Engineering and Design,2014,275:197-204.
[15]  Wang C,Xie D M,Xiong Y H,et al.Research of temperature characteristics of non-equilibrium condensation in transonic steam flow[C]//Proceedings of the ASME Turbo Expo 2014:Turbine Technical Conference and Exposition,GT2014-26455.Düsseldorf,Germany:ASME,2014.
[16]  Gerber A G,Sigg R,Völker L,et al.Predictions of non-equilibrium phase transition in a model low-pressure steam turbine[J].Proceedings of the Institution of Mechanical Engineers,Part A:Journal of Power and Energy,2007,221(6):825-835.
[17]  韩中合,陈柏旺,刘刚,等.湿蒸汽亮相凝结流动中水滴生长模型研究[J].中国电机工程学报,2011,31(29):79-84. Han Zhonghe,Chen Baiwang,Liu Gang,et al.Droplets growth model in wet steam two-phase condensation flow[J].Proceedings of the CSEE,2011,31(29):79-84(in Chinese).
[18]  Bammert K,Sandstede H.Measurements concerning the influence of surface roughness and profile changes on the performance of gas turbines[J].Journal of Engineering for Gas Turbines and Power,1972,94(3):207-213.
[19]  Dykas S,Wróblewski W,Łukowicz H.Prediction of losses in the flow through the last stage of low-pressure steam turbine[J].International Journal for Numerical Methods in Fluids,2007,53(6):933-945.
[20]  Starzmann J,Casey M,Sieverding F.Non-equilibrium condensation effects on the flow field and the performance of a low pressure steam turbine[C]//ASME Turbo Expo 2010:Power for Land,Sea,and Air,GT2010-22467.Glasgow,UK:ASME,2010.
[21]  Grüebel M,Starzmann J,Schatz M,et al.Two-phase flow modeling and measurements in low-pressure turbines-part 1:numerical validation of wet steam models and turbine modeling[C]//Proceedings of the ASME Turbo Expo 2014:Turbine Technical Conference and Exposition,GT2014-25244.Düsseldorf,Germany:ASME,2014.
[22]  Starzmann J,Casey M M,Mayer J F,et al.Wetness loss prediction for a lowpressure steam turbine using computational fluid dynamics[J].Proceedings of the Institution of Mechanical Engineers,Part A:Journal of Power and Energy,2013,228(2):216-231.
[23]  Nikkhahi B,Shams M,Ziabasharhagh M.A numerical investigation of two-phase steam flow around a 2-D turbine’s rotor tip[J].International Communications in Heat and Mass Transfer,2009,36(6):632-639.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133