预旋喷嘴径向角度对预旋特性影响的数值研究
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摘要
为了降低低位进气预旋流路的气动损失,针对带有不同径向角度(0°～30°)预旋喷嘴的预旋系统进行了数值仿真,并对流动特性、温降特性和比熵增特性进行了分析。结果表明:随着预旋喷嘴径向角度的增大,预旋系统无量纲温降先增大后减小,流动阻力减小,预旋系统的流量随之增大。旋转雷诺数为2.3×107时,预旋喷嘴带径向角度的预旋系统无量纲温降比传统喷嘴最大可提高18.3%,存在某一角度使预旋温降特性达到最好。预旋系统内的耗散主要发生在预旋腔和共转盘腔内,径向角度为10°时其比熵增变化量分别占整个预旋系统总体比熵增的42.4%和30.2%;合理设计预旋喷嘴的径向角度,能改善预旋腔内气流的流动效果,并且可以减少整个预旋系统的不可逆损失。
To reduce the aerodynamic loss in a low position pre-swirl system,numerical simulations were carried out to study the flow characteristics,temperature drop and specific entropy increment for pre-swirl system with nozzles radial angles from 0°to 30°.The results showed that non-dimensional temperature drop increased firstly and then decreased,and flow resistance reduced with the increasing pre-swirl nozzle radial angle bringing about the increase of mass flow rate.The non-dimensional temperature drop of pre-swirl system nozzles with radial angle most increased 18.3% than traditional nozzles when rotational Reynolds number was 2.3×107,and there was a certain angle that could lead to the best characteristics of temperature drop.The dissipative loss of the pre-swirl system mainly occurred in the pre-swirl cavity and the rotating cavity,making up 42.4% and 30.2% of the total specific entropy increment respectively when nozzles radial angle was 10°.It could improve the flow effects in pre-swirl cavity and reduce the loss of pre-swirl system if the nozzles radial angle was designed properly.
To reduce the aerodynamic loss in a low position pre-swirl system,numerical simulations were carried out to study the flow characteristics,temperature drop and specific entropy increment for pre-swirl system with nozzles radial angles from 0°to 30°.The results showed that non-dimensional temperature drop increased firstly and then decreased,and flow resistance reduced with the increasing pre-swirl nozzle radial angle bringing about the increase of mass flow rate.The non-dimensional temperature drop of pre-swirl system nozzles with radial angle most increased 18.3% than traditional nozzles when rotational Reynolds number was 2.3×107,and there was a certain angle that could lead to the best characteristics of temperature drop.The dissipative loss of the pre-swirl system mainly occurred in the pre-swirl cavity and the rotating cavity,making up 42.4% and 30.2% of the total specific entropy increment respectively when nozzles radial angle was 10°.It could improve the flow effects in pre-swirl cavity and reduce the loss of pre-swirl system if the nozzles radial angle was designed properly.
引文
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[10]林立,谭勤学,吴康.低位预旋进气转静系盘腔流动特性研究[J].推进技术,2016,37(2):258-265.LIN Li,TAN Qinxue,WU Kang.Study of flow dynamics in rotor-stator cavity with low-radius preswirl inlet[J].Journal of Propulsion Technology,2016,37(2):258-265.(in Chinese)
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[12] ZHANG Feng,WANG Xinjun,LI Jun.Numerical investigation of flow and heat transfer characteristics in radial pre-swirl system with different pre-swirl nozzle angles[J].International Journal of Heat and Mass Transfer,2016,95(4):984-995.
[13] ZHANG Feng,WANG Xinjun,LI Jun.Numerical investigation on the flow and heat transfer characteristics in radial pre-swirl system with different fillet radius at the junction of inlet cavity and nozzle[J].Applied Thermal Engineering,2016,106(8):1165-1175.
[14]刘高文,张林,务卫涛,等.长径比对预旋孔流动特性影响的数值研究[J].推进技术,2013,34(5):644-650.LIU Gaowen,ZHANG Lin,WU Weitao,et al.Numerical simulations on the flow characteristics of the pre-swirl nozzle with different length-to-diameter ratios[J].Journal of Propulsion Technology,2013,34(5):644-650.(in Chinese)
[15]刘高文,李碧云,蒋兆午,等.预旋角度对预旋孔流动特性的影响[J].推进技术,2012,33(5):740-746.LIU Gaowen,LI Biyun,JIANG Zhaowu,et al.Effects of pre-swirl angle on flow characteristics of pre-swirl nozzle[J].Journal of Propulsion Technology,2012,33(5):740-746.(in Chinese)
[16]刘波,王永红.预旋喷嘴流动特性试验研究[J].燃气涡轮试验与研究,2009,22(3):45-46.LIU Bo,WANG Yonghong.Experimental investigation of flow characteristics in pre-swirl nozzles[J].Gas Turbine Experiment and Research,2009,22(3):45-46.(in Chinese)
[17]丁水汀,李烨,张弓.旋转盘腔预旋角度的敏感性分析[J].航空动力学报,2011,26(10):2251-2257.DING Shuiting,LI Ye,ZHANG Gong.Sensibility analysis of inlet pre-swirl angle in the rotating cavity[J].Journal of Aerospace Power,2011,26(10):2251-2257.(in Chinese)
[18]祝昭.转/静交界面处理方法研究及涡轮结构与气动分析[D].南京:南京航空航天大学,2008.
[19] YAN Youyou,GORD M F,LOCK G D,et al.Fluid dynamics of a pre-swirl rotor-stator system[J].Journal of Turbomachinery,2003,125(4):805-813.
[20] KOCK F,HERWIG H.Entropy generation calculation for turbulent shear flows and their implementation in CFD codes[J].International Journal of Heat and Fluid Flow,2005,26(4):672-680.
[2] LOCK G D,WILSON M,OWEN J M.Influence of fluid dynamics on heat transfer in a preswirl rotating-disk system[J].Journal of Engineering for Gas Turbines and Power,2005,127(4):791-797.
[3] KARNAHL J,Von WOLFERSDORF J,THAM K,et al.Computational fluid dynamics simulations of flow and heat transfer in a preswirl system:influence of rotating-stationary domain interface[J].Journal of Engineering for Gas Turbines and Power,2012,134(5):110-115.
[4] JAVIYA U,CHEW J W,HILLS N J,et al.CFD analysis of flow and heat transfer in a direct transfer preswirl system[J].Journal of Turbomachinery,2012,134(3):031017.1-031017.9.
[5] LOCK G D,YAN Y,NEWTON P J,et al.Heat transfer measurements using liquid crystals in a preswirl rotatingdisk system[J].Journal of Engineering for Gas Turbines and Power,2005,127(2):375-382.
[6] SCRICCA J A,MOORE K D.Effects of‘cooled’cooling air on pre-swirl nozzle design[R].Cleveland,US:Aircraft Propulsion and Power,2006-214329/vol1,2006.
[7] JAVIYA U,CHEW J,HILLS N,et al.A comparative study of cascade vanes and drilled nozzle designs for preswirl[R].ASME Paper 2011-GT-46006,2011.
[8]徐昊,王锁芳.预旋喷嘴对预旋系统温降特性的数值研究[J].重庆理工大学学报,2015,29(3):30-36.XU Hao,WANG Suofang.Numerical research on influences of pre-swirl nozzles on temperature reduction characteristic of pre-swirl system[J].Journal of Chongqing University of Technology,2015,29(3):30-36.(in Chinese)
[9]王锁芳,朱强华,张羽,等.预旋进气位置对转静盘腔换热影响的数值研究[J].航空动力学报,2007,22(8):1227-1232.WANG Suofang,ZHU Qianghua,ZHANG Yu,et al.Experimental study on heat transfer in rotor-stator cavity with high-positioned pre-swirl inflow[J].Journal of Aerospace Power,2007,22(8):1227-1232.(in Chinese)
[10]林立,谭勤学,吴康.低位预旋进气转静系盘腔流动特性研究[J].推进技术,2016,37(2):258-265.LIN Li,TAN Qinxue,WU Kang.Study of flow dynamics in rotor-stator cavity with low-radius preswirl inlet[J].Journal of Propulsion Technology,2016,37(2):258-265.(in Chinese)
[11] ZHANG Feng,WANG Xinjun,LIAO Gaoliang,et al.Computational fluid dynamics analysis for effect of length to diameter ratio of nozzles on performance of pre-swirl systems[J].Journal of Power and Energy,2015,229(4):381-392.
[12] ZHANG Feng,WANG Xinjun,LI Jun.Numerical investigation of flow and heat transfer characteristics in radial pre-swirl system with different pre-swirl nozzle angles[J].International Journal of Heat and Mass Transfer,2016,95(4):984-995.
[13] ZHANG Feng,WANG Xinjun,LI Jun.Numerical investigation on the flow and heat transfer characteristics in radial pre-swirl system with different fillet radius at the junction of inlet cavity and nozzle[J].Applied Thermal Engineering,2016,106(8):1165-1175.
[14]刘高文,张林,务卫涛,等.长径比对预旋孔流动特性影响的数值研究[J].推进技术,2013,34(5):644-650.LIU Gaowen,ZHANG Lin,WU Weitao,et al.Numerical simulations on the flow characteristics of the pre-swirl nozzle with different length-to-diameter ratios[J].Journal of Propulsion Technology,2013,34(5):644-650.(in Chinese)
[15]刘高文,李碧云,蒋兆午,等.预旋角度对预旋孔流动特性的影响[J].推进技术,2012,33(5):740-746.LIU Gaowen,LI Biyun,JIANG Zhaowu,et al.Effects of pre-swirl angle on flow characteristics of pre-swirl nozzle[J].Journal of Propulsion Technology,2012,33(5):740-746.(in Chinese)
[16]刘波,王永红.预旋喷嘴流动特性试验研究[J].燃气涡轮试验与研究,2009,22(3):45-46.LIU Bo,WANG Yonghong.Experimental investigation of flow characteristics in pre-swirl nozzles[J].Gas Turbine Experiment and Research,2009,22(3):45-46.(in Chinese)
[17]丁水汀,李烨,张弓.旋转盘腔预旋角度的敏感性分析[J].航空动力学报,2011,26(10):2251-2257.DING Shuiting,LI Ye,ZHANG Gong.Sensibility analysis of inlet pre-swirl angle in the rotating cavity[J].Journal of Aerospace Power,2011,26(10):2251-2257.(in Chinese)
[18]祝昭.转/静交界面处理方法研究及涡轮结构与气动分析[D].南京:南京航空航天大学,2008.
[19] YAN Youyou,GORD M F,LOCK G D,et al.Fluid dynamics of a pre-swirl rotor-stator system[J].Journal of Turbomachinery,2003,125(4):805-813.
[20] KOCK F,HERWIG H.Entropy generation calculation for turbulent shear flows and their implementation in CFD codes[J].International Journal of Heat and Fluid Flow,2005,26(4):672-680.