稳定流和不稳定流中Wells透平的流动特性
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摘要
为了研究不稳定流对Wells透平内部流动的影响,本文通过实验、数值计算方法研究了NACA翼型和优化翼型Wells透平在稳定流、不稳定流中的流动特性。实验结果表明:不同流动中,优化翼型都提高了透平的最高转换效率,拓宽了正常运行流量系数范围;不稳定气流中,Wells透平的平均输出力矩高于同样进口速度条件下的准稳态分析结果,不稳流中的输出扭矩能够达到准稳态分析结果的1. 23～1. 26倍。不稳定流对优化翼型输出扭矩的提升效果低于NACA翼型。
To study the effect of unsteady flow on the internal flow of Wells turbine,the experimental method and numerical calculation method were used to investigate the flow characteristics of the NACA airfoil and the optimized airfoil of Wells turbine under steady and unsteady flows. The experimental results show that the optimized airfoil always increased the maximum conversion efficiency of the turbine and broadened the range of normal operating flow coefficients in different flows. The average output torque of the Wells turbine under unsteady flow was higher than that under quasi-steady state at the same inlet speed. According to the analysis,the average output torque in unsteady flow can be 1. 23 to 1. 26 times that in quasi-steady flow. The improvement effects of unsteady flow to the optimized airfoil is worse than that of the NACA airfoil.
To study the effect of unsteady flow on the internal flow of Wells turbine,the experimental method and numerical calculation method were used to investigate the flow characteristics of the NACA airfoil and the optimized airfoil of Wells turbine under steady and unsteady flows. The experimental results show that the optimized airfoil always increased the maximum conversion efficiency of the turbine and broadened the range of normal operating flow coefficients in different flows. The average output torque of the Wells turbine under unsteady flow was higher than that under quasi-steady state at the same inlet speed. According to the analysis,the average output torque in unsteady flow can be 1. 23 to 1. 26 times that in quasi-steady flow. The improvement effects of unsteady flow to the optimized airfoil is worse than that of the NACA airfoil.
引文
[1]WU Bijun,LI Meng,WU Rukang,et al.Experimental study on primary efficiency of a new pentagonal backward bent duct buoy and assessment of prototypes[J].Renewable energy,2017,113:774-783.
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[3]RAGHUNATHAN S,TAN C P,OMBAKA O O.Performance of the Wells self-rectifying air turbine[J].The aeronautical journal,1985,89(890):369-379.
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[6]OHNEDA H,IGARASHI S,SHINBO O,et al.Construction procedure of a wave power extracting caisson breakwater[C]//Proceedings of the 3rd Symposium on Ocean Energy Utilization.Tokyo,1991:171-179.
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[11]TAKAO M,SETOGUCHI T,NAGATA S,et al.A study on the effects of blade profile and non-uniform tip clearance of the wells turbine[C]//Proceedings of the ASME2008 27th International Conference on Offshore Mechanics and Arctic Engineering.Estoril,Portugal,2008:1-8.
[12]CUI Ying,HYUN B S.Numerical study on Wells turbine with penetrating blade tip treatments for wave energy conversion[J].International journal of naval architecture and ocean engineering,2016,8(5):456-465.
[13]黄忠洲,余志,蒋念东,等.规则往复流中Wells透平自起动过程的数值模拟和实验研究[J].太阳能学报,2006,27(3):284-288.HUANG Zhongzhou,YU Zhi,JIANG Niandong,et al.Self-starting performance of wells turbine in regular reciprocating airflow[J].Acta energiae solaris sinica,2006,27(3):284-288.
[14]STARZMANN R,CAROLUS T.Effect of blade skew strategies on the operating range and aeroacoustic performance of the Wells turbine[J].Journal of turbomachinery,2014,136(1):011003.
[15]STARZMANN R,CAROLUS T,TEASE K,et al.Wells turbine rotors:a comparison of the predicted and measured aerodynamic performance[C]//Proceedings of the 9th European Turbomachinery Conference.Istanbul,Turkey,2011:1085-1095.
[2]STARZMANN R,CAROLUS T H,TEASE K,et al.Effect of design parmeters on aero-acoustic and aerodynamic performance of Wells turbines[C]//Proceedings of the ASME2011 30th International Conference on Ocean,Offshore and Arctic Engineering.Rotterdam,Netherlands,2011:1-10.
[3]RAGHUNATHAN S,TAN C P,OMBAKA O O.Performance of the Wells self-rectifying air turbine[J].The aeronautical journal,1985,89(890):369-379.
[4]SETOGUCHI T,KANEKO K,MAEDA H,et al.Impulse turbine with self-pitch-controlled guide vanes for wave power conversion:performance of mono-vane type[J].International journal of offshore and polar engineering,1993,3(1):73-78.
[5]MCCORMICK M E,REHAK J G,WILLIAMS B D.An experimental study of a bidirectional radial turbine for pneumatic wave energy conversion[C]//Proceedings of Mastering the Oceans Through Technology.Newport,RI,USA,1992:866-870.
[6]OHNEDA H,IGARASHI S,SHINBO O,et al.Construction procedure of a wave power extracting caisson breakwater[C]//Proceedings of the 3rd Symposium on Ocean Energy Utilization.Tokyo,1991:171-179.
[7]WHITTAKER T J T,MCILWAINE S J,RAGHUNATHANS.A review of the Islay shoreline wave power plant[C]//Proceedings of the 1st European Wave Energy Symposium.Edinburgh,1993:283-286.
[8]FALCO A F D O.The shoreline OWC wave power plant at the Azores[C]//Proceedings of the 4th European Wave Energy Conference.Denmark,2000:42-47.
[9]HEATH T,WHITTAKER T J T,BOAKE C B.The design,construction and operation of the LIMPET wave energy converter[C]//Proceedings of the 4th European Wave Energy Conference.Aalborg,2000:49-55.
[10]SETOGUCHI T,SANTHAKUMAR S,TAKAO M,et al.A modified Wells turbine for wave energy conversion[J].Renewable energy,2003,28(1):79-91.
[11]TAKAO M,SETOGUCHI T,NAGATA S,et al.A study on the effects of blade profile and non-uniform tip clearance of the wells turbine[C]//Proceedings of the ASME2008 27th International Conference on Offshore Mechanics and Arctic Engineering.Estoril,Portugal,2008:1-8.
[12]CUI Ying,HYUN B S.Numerical study on Wells turbine with penetrating blade tip treatments for wave energy conversion[J].International journal of naval architecture and ocean engineering,2016,8(5):456-465.
[13]黄忠洲,余志,蒋念东,等.规则往复流中Wells透平自起动过程的数值模拟和实验研究[J].太阳能学报,2006,27(3):284-288.HUANG Zhongzhou,YU Zhi,JIANG Niandong,et al.Self-starting performance of wells turbine in regular reciprocating airflow[J].Acta energiae solaris sinica,2006,27(3):284-288.
[14]STARZMANN R,CAROLUS T.Effect of blade skew strategies on the operating range and aeroacoustic performance of the Wells turbine[J].Journal of turbomachinery,2014,136(1):011003.
[15]STARZMANN R,CAROLUS T,TEASE K,et al.Wells turbine rotors:a comparison of the predicted and measured aerodynamic performance[C]//Proceedings of the 9th European Turbomachinery Conference.Istanbul,Turkey,2011:1085-1095.