核主泵动静叶栅内部瞬态流动特性研究
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摘要
采用分离涡模型(DES)和块结构化网格技术,针对CAP1400反应堆冷却剂泵原型和0.4缩比模型,通过计算流体力学(CFD)数值分析和外特性试验,验证了DES模型的适应性和计算精度。首先,在不同工况下研究模型泵动静叶栅表面载荷分布规律,发现叶片所受载荷极不均匀,靠叶片前盖板处的载荷约为靠后盖板处的2倍;导叶叶片所受的载荷随工况变化的差异性较为复杂,大流量下近入口段载荷相对较大,甚至改变方向。基于涡动力学阐明了动静叶栅内湍涡运动和演化过程,揭示了在噪声干扰条件下叶轮、导叶的瞬态流场结构及演化机制。
Based on DES vortex model and block structured grid technology,the adaptability and accuracy of DES model for the CAP1400 reactor coolant pump prototype and 0.4 scale model is verified through CFD numerical analysis and experimental investigation of exterior performances.Compared with the loading distribution on surface of the model pump rotor-stator cascade under different conditions,it is found that the blade load is very uneven,the blade load of impeller front cover is about 2 times than that of the rear; with the change of working condition,the difference of load guide blades is complex,and the load of the entrance section is relatively large under a large flow,even when changing the direction.Based on the turbulent vortex dynamics,the vortex motion and the evolution process of the rotor-stator cascade are clarified.The structure and evolution mechanism of the transient flow field of impeller and guide vane under the condition of noise disturbance are revealed.
Based on DES vortex model and block structured grid technology,the adaptability and accuracy of DES model for the CAP1400 reactor coolant pump prototype and 0.4 scale model is verified through CFD numerical analysis and experimental investigation of exterior performances.Compared with the loading distribution on surface of the model pump rotor-stator cascade under different conditions,it is found that the blade load is very uneven,the blade load of impeller front cover is about 2 times than that of the rear; with the change of working condition,the difference of load guide blades is complex,and the load of the entrance section is relatively large under a large flow,even when changing the direction.Based on the turbulent vortex dynamics,the vortex motion and the evolution process of the rotor-stator cascade are clarified.The structure and evolution mechanism of the transient flow field of impeller and guide vane under the condition of noise disturbance are revealed.
引文
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[2]Moczala M,Lavanetee V,Parvizinia M.Numerical investigation of losses due to unsteady effects in axial turbines[J].ASME Paper,2003,388(38):175-198.
[3]Zhongxin Gao,Wenruo Zhu,Li Lu,et al.Numerical and experimental study of unsteady flow in a large centrifugal pump with stay vanes[J].Journal of Fluids Engineering.2014.136(7):071101-10.
[4]Gonza‘lez J,Carlos Santolaria.Unsteady flow structure and global variables in a centrifugal pump[J].Journal of Fluids Engineering Transactions of the ASME.2006,128(5):937-946.
[5]Gonza‘lez J,J FernáNdez,et al.Numerical simulation of the dynamic effects due to impeller-volute interaction in a Centrifugal pump[J].Journal of Fluids Engineering,2002,124(2):348-355.
[6]Khalifa AE,Al-Qutub AM,Ben-Mansour R.Study of pressure fluctuations and induced vibration at blade-passing frequencies of a double volute pump[J].Arb J Sci Eng,2011,36:1333-1345.
[7]Spalart P R,Jou W H,Strelets M,et al.Comments on the feasibility of LES for wings,and on a hybrid RANS/LES approach[A].//Liu C,Liu Z.eds.Advances in DNS/LES,1st AFOST Int.Cong.On DNS/LES,Aug.4-8,1997,Ruston L A.Columbus,OH:Greyden Press,1997.
[8]Arroyo-Callejo G,Laroche E,Millan P,et al.Numerical investigation of compound angle effusion cooling using differential reynolds stress model and zonal detached eddy simulation approaches[J].Journal of Turbo machinery,2016,138(10):101001-101001-11.
[9]Breuer M.large eddy simulation of the subcritical flow past a circular cylinder:numerical and modeling aspects[J].Int J Numer Meth Fluids,1998,28:1281-1302.
[10]Dong Hun Y,Nicholas P Js.Characterization of flow oblique to a circular cylinder with low aspect ratio using3-D detached eddy simulation[J].Journal of Wind Engineering and Industrial Aerodynamics,2011,99(11):1117-1125.
[11]Nguyen V T,Nguyen H H.Detached eddy simulations of flow induced vibrations of circular cylinders at high Reynolds numbers[J].Journal of Fluids and Structures,2016,63:103-119.
[12]Bai W,Mingham C G,Causon D M,et al.Detached eddy simulation of turbulent flow around square and circular cylinders on Cartesian cut cells[J].Ocean Engineering,2016,117:1-14.
[13]Uzun A,Yousuff Hussaini M.An application of delayed detached eddy simulation to tandem cylinder flow field prediction[J].Computers&Fluids,Volume 60,15 May2012:71-85.
[14]黄剑峰,张立翔,王文全,等.混流式水轮机三维非定常流分离涡模型的精细模拟[J].中国电机工程学报,2011,26:83-89.
[15]Spalart P R,Allamas S R.A one-equation turbulence model for an aerodynamic flow[J].La Recherche Aérospatiale,1992,439(1):5-21.
[16]Masaru Kato,Osamu Sato.Extended molecular dynamics methods for vortex dynamics in nanostructured superconductors[J].Physics Procedia,2015,65:81-84.