导叶安装角对两级动叶可调轴流风机性能及静力结构的影响
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摘要
为研究导叶安装角对两级动叶可调轴流风机性能及静力结构的影响,采用Fluent软件对第一级导叶安装角改变前后两级动叶可调轴流风机进行了三维数值模拟,分析了导叶安装角对风机气动性能、内流特征和静力结构影响。结果表明:导叶安装角负向偏转时的全压优于原风机,且同一流量下,增大安装角可提高风机全压,安装角正向偏转与之相反;安装角负向偏转后的风机效率均略微低于原风机,而正向偏转后在小流量侧其效率高于原风机,在大流量侧其效率低于原风机,且随流量增加效率下降愈明显。导叶安装角负向偏转后动叶表面总压分布发生明显改变,做功能力显著增强,第二级动叶区和导叶区熵产率有所增加;其第二级动叶等效应力及总变形分布基本不变,但应力和总变形最大值有所增加,固有频率有所降低。
To investigate the effects of guide vane installation angle on the performance and static structure of two-stage variable-pitch axial fans, this paper applied Fluent to conduct three-dimensional numerical simulations of a two-stage variable-pitch axial fan. By comparing the simulations under positive deflection and negative deflection of the first-stage guide vane installation angle, this paper analyzed the effects on the subject fan from the perspectives of performance, internal dynamics, static structure. Results reveal that the total pressure rising with negative deflection of the guide vane installation angle is better than the original fan, and is improved with the increasing installation angle under the same flow rate, while it manifests the opposite variation under the condition of the positive deflection of guide vane installation angle. Compared with the efficiency of the original fan, the efficiency with negative deflection is slightly lower while the efficiency with positive deflection is higher at low flow rate but lower at high flow rate, and is reducing obviously as the flow rate keeps increasing. For the scheme of negative deflection, the total pressure distribution on the rotor blades is varied significantly. The blade work ability and the entropy generation rate in the second-stage rotor blade and guide vane is augmented. However, the distributions of the equivalent stress and total deformation of the second-stage rotor blade stay the same. Besides, the maximal values are raised, and the natural frequency of rotor blades is reduced slightly.
To investigate the effects of guide vane installation angle on the performance and static structure of two-stage variable-pitch axial fans, this paper applied Fluent to conduct three-dimensional numerical simulations of a two-stage variable-pitch axial fan. By comparing the simulations under positive deflection and negative deflection of the first-stage guide vane installation angle, this paper analyzed the effects on the subject fan from the perspectives of performance, internal dynamics, static structure. Results reveal that the total pressure rising with negative deflection of the guide vane installation angle is better than the original fan, and is improved with the increasing installation angle under the same flow rate, while it manifests the opposite variation under the condition of the positive deflection of guide vane installation angle. Compared with the efficiency of the original fan, the efficiency with negative deflection is slightly lower while the efficiency with positive deflection is higher at low flow rate but lower at high flow rate, and is reducing obviously as the flow rate keeps increasing. For the scheme of negative deflection, the total pressure distribution on the rotor blades is varied significantly. The blade work ability and the entropy generation rate in the second-stage rotor blade and guide vane is augmented. However, the distributions of the equivalent stress and total deformation of the second-stage rotor blade stay the same. Besides, the maximal values are raised, and the natural frequency of rotor blades is reduced slightly.
引文
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[9] 李春曦,林卿,叶学民.轴流风机动叶安装角异常时的能量特征提取研究[J].华北电力大学学报(自然科学版),2015,42(4):70-76.Li Chunxi,Lin Qin,Ye Xuemin.Energy Feature Extraction of an Axial Flow Fan with Abnormal Blade Angle [J].Journal of North China Electric Power University(Natural Science Edition),2015,42(4):70-76.
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[15] 丛星亮,余永生.锅炉尾部烟道的阻力特性及测试[J].电站辅机,2017,38(2):33-35.CONG Xingliang,YU Yongsheng.Flue Resistance Characteristic and Test of Boiler Back end[J].Power Station Auxiliary Equipment,2017,38(2):33-35.
[16] 袁斌.600MW锅炉烟道阻力增加的原因分析及处理[J].锅炉制造,2009,(5):20-23.YUAN Bin.Analysis and Treatment of Increased Flue Resistance in 600MW Boiler[J].Boiler Manufacturing,2009,(5):20-23.
[17] KHELLADI S,KOUIDRI S,BAKIR F,et al.Predicting tonal noise from a high rotational speed centrifugal fan[J].Journal of Sound & Vibration,2008,313(1-2):113-133.
[18] 叶学民,李新颖,李春曦.第一级叶轮单动叶安装角异常对动叶可调轴流风机性能的影响[J].中国电机工程学报,2014,34(14):2297-2306.YE Xuemin,LI Xinying,LI Chunxi.Effect of the First-stage Impeller With Single Abnormal Blade on the Performance of a Variable Pitch Axial Fan[J].Proceedings of the CSEE,2014,34(14):2297-2306.
[19] 张磊,郎进花,王松岭.电站轴流风机旋转失速工况下的叶轮静力特性研究[J].动力工程学报,2015,35(5):387-393.ZHANG Lei,LANG Jinhua,WANG Songling.Static Characteristics of the Impeller of an Axial Flow Fan Under Rotating Stall Conditions[J].Journal of Chinese Society of Power Engineering,2015,35(5):387-393.
[20] LEE Y J,JHAN Y T,CHUNG C H.Fluid-structure interaction of FRP wind turbine blades under aerodynamic effect[J].Composites Part B Engineering,2012,43(5):2180-2191.
[21] 叶学民,丁学亮,李春曦.轴流风机叶片切割后的性能及静力结构特性[J].动力工程学报,2015,35(9):752-759.YE Xuemin,DING Xueliang,LI Chunxi.Performance and Static Analysis of an Axial Fan After Blade Trimming[J].Journal of Chinese Society of Power Engineering,2015,35(9):752-759.
[22] 叶学民,李鹏敏,李春曦.双凹槽叶顶结构下的轴流风机性能及叶片振动特性研究[J].机械工程学报,2015,51(4):167-174.YE Xuemin,LI Pengmin,LI Chunxi.Investigation of Double Grooved Blade Tip Structure on Aerodynamic Performance and Vibration Characteristic of an Axial Flow Fan[J].Journal of Mechanical Engineering,2015,51(4):167-174.
[2] LIU R,LIU J,YU Y.Effects of axial inclined guide vanes on a turbo air classifier[J].Powder Technology,2015,280:1-9.
[3] 程效锐,贾程莉,杨从新,等.导叶周向布置位置对核主泵压力脉动的影响[J].机械工程学报,2016,52(16):197-204.CHENG Xiaorui,JIA Chengli,YANG Congxin,et al.Influence of Circumferential Position of Guide Vane on Unsteady Flow Characteristics in Reactor Coolant Pump[J].Journal of Mechanical Engineering,2016,52(16):197-204.
[4] 石亚君,葛爱香,付艳霞,等.基于CFD方法的离心风机叶轮和导叶的改型分析[J].风机技术,2017,59(6):27-31.SHI Yajun,GE Aixiang,FU Yangxia,et al.Retrofit Analysis of the Impeller and Guide Vanes of a Centrifugal Fan Based on CFD[J].Compressor,Blower & Fan Technology,2017,59(6):27-31.
[5] 叶学民,李新颖,李春曦.第一级导叶改进对两级动叶可调轴流风机性能的影响[J].动力工程学报,2014,34(3):228-235.YE Xuemin,LI Xinying,LI Chunxi.Effects of First-stage Guide Vane Improvement on Performance of Two-stage Variable Vane Axial Flow Fan[J].Power Engineering,2014,34(3):228-235.
[6] KASSENS I,RAUTENBERG M.Flow Measurements Behind the Inlet Guide Vane of a Centrifugal Compressor[C]// ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition,1998:V001T01A025.
[7] 周国义,苏高,杜飞.基于静叶不同安装角的增压锅炉烟气涡轮多叶片通道数值模拟[J].海军工程大学学报,2014,(2):54-57.ZHOU Guoyi,SU Gao,DU Fei.Numerical Simulation of Muti-blade Channel of Supercharged Boiler Exhausts Gas Turbine Based on Different Static Blade Angle[J].Journal of Naval University of Engineering,2014,(2):54-57.
[8] 王华强,王英锋,常炜,等.静叶调节对多级轴流压缩机性能影响的分析[J].风机技术,2017,59(3):8-13.WANG Huaqiang,WANG Yingfeng,CHANG Wei,et al.The Effect of Variable Static Blade Adjustable on Multistage Axial Compressor Performance[J].Compressor,Blower & Fan Technology,2017,59(3):8-13.
[9] 李春曦,林卿,叶学民.轴流风机动叶安装角异常时的能量特征提取研究[J].华北电力大学学报(自然科学版),2015,42(4):70-76.Li Chunxi,Lin Qin,Ye Xuemin.Energy Feature Extraction of an Axial Flow Fan with Abnormal Blade Angle [J].Journal of North China Electric Power University(Natural Science Edition),2015,42(4):70-76.
[10] FABIAN Kock,HEINZ Herwig.Entropy production calculation for turbulent shear flows and their implementation in cfd codes[J].International Journal of Heat and Fluid Flow,2005,26(4):672-680.
[11] HERWIG H,KOCK F.Direct and indirect methods of calculating entropy generation rates in turbulent convective heat transfer problems[J].Heat and mass transfer,2007,(3):207-215.
[12] HERWIG H,KOCK F.Local Entropy Production in Turbulent Shear Flows:A Tool for Evaluating Heat Transfer Performance[J].Journal of Thermal Science,2006,(2):159-167.
[13] 昌泽舟.轴流式通风机实用技术[M].北京:机械工业出版社,2005.
[14] 赵杰.多相泵复合式静叶CFD模拟及流场分析[D].兰州:兰州理工大学,2009.
[15] 丛星亮,余永生.锅炉尾部烟道的阻力特性及测试[J].电站辅机,2017,38(2):33-35.CONG Xingliang,YU Yongsheng.Flue Resistance Characteristic and Test of Boiler Back end[J].Power Station Auxiliary Equipment,2017,38(2):33-35.
[16] 袁斌.600MW锅炉烟道阻力增加的原因分析及处理[J].锅炉制造,2009,(5):20-23.YUAN Bin.Analysis and Treatment of Increased Flue Resistance in 600MW Boiler[J].Boiler Manufacturing,2009,(5):20-23.
[17] KHELLADI S,KOUIDRI S,BAKIR F,et al.Predicting tonal noise from a high rotational speed centrifugal fan[J].Journal of Sound & Vibration,2008,313(1-2):113-133.
[18] 叶学民,李新颖,李春曦.第一级叶轮单动叶安装角异常对动叶可调轴流风机性能的影响[J].中国电机工程学报,2014,34(14):2297-2306.YE Xuemin,LI Xinying,LI Chunxi.Effect of the First-stage Impeller With Single Abnormal Blade on the Performance of a Variable Pitch Axial Fan[J].Proceedings of the CSEE,2014,34(14):2297-2306.
[19] 张磊,郎进花,王松岭.电站轴流风机旋转失速工况下的叶轮静力特性研究[J].动力工程学报,2015,35(5):387-393.ZHANG Lei,LANG Jinhua,WANG Songling.Static Characteristics of the Impeller of an Axial Flow Fan Under Rotating Stall Conditions[J].Journal of Chinese Society of Power Engineering,2015,35(5):387-393.
[20] LEE Y J,JHAN Y T,CHUNG C H.Fluid-structure interaction of FRP wind turbine blades under aerodynamic effect[J].Composites Part B Engineering,2012,43(5):2180-2191.
[21] 叶学民,丁学亮,李春曦.轴流风机叶片切割后的性能及静力结构特性[J].动力工程学报,2015,35(9):752-759.YE Xuemin,DING Xueliang,LI Chunxi.Performance and Static Analysis of an Axial Fan After Blade Trimming[J].Journal of Chinese Society of Power Engineering,2015,35(9):752-759.
[22] 叶学民,李鹏敏,李春曦.双凹槽叶顶结构下的轴流风机性能及叶片振动特性研究[J].机械工程学报,2015,51(4):167-174.YE Xuemin,LI Pengmin,LI Chunxi.Investigation of Double Grooved Blade Tip Structure on Aerodynamic Performance and Vibration Characteristic of an Axial Flow Fan[J].Journal of Mechanical Engineering,2015,51(4):167-174.