基于大涡模拟的波形板汽水分离器数值研究
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摘要
采用Lagrange-Euler方法对波形板汽水分离器内离散气-液两相流动进行了数值模拟研究。对于连续相,使用大涡模拟(LES)湍流模型替代常见的雷诺平均模型(RANS)进行数值模拟。大涡模拟方法将湍流分为大、小两种尺度,大尺度涡采用直接数值求解,只对小尺度湍流脉动建立模型。此方法不仅可给出更准确的分离效率等整体性能,同时可得到流动的瞬态细节和湍流脉动对液滴的影响,进而获得更为准确可信的液滴轨迹。计算结果表明,大涡模拟得到的结果同实验结果符合良好;与雷诺平均模型相比,大涡模拟可为汽水分离器的机理研究和优化设计提供更基础的模型。
Lagrange-Euler method was used to simulate the droplet-laden flow in corrugated plate separators. In order to calculate the turbulence of continuous phase,large-eddy simulation( LES) turbulence model was chosen to replace the Reynolds-averaged Navier-Stockes equations( RANS). The turbulence was divided into large scale and small scale in large-eddy simulation. The large scale vortexes were calculated directly,while small scale vortexes were modeled. This method not only can give more accurate overall performances,such like the separation efficiency,but also can show the details of transient turbulence flows. Therefore,more accurate and reliable trajectories of droplets can be obtained. The results obtained by large-eddy simulation are in good agreement with experiment results. Compared with results obtained by the RANS,large-eddy simulation can provide more informations on the mechanism of the corrugated plate separator which are important for optimal design of corrugated plate separators.
Lagrange-Euler method was used to simulate the droplet-laden flow in corrugated plate separators. In order to calculate the turbulence of continuous phase,large-eddy simulation( LES) turbulence model was chosen to replace the Reynolds-averaged Navier-Stockes equations( RANS). The turbulence was divided into large scale and small scale in large-eddy simulation. The large scale vortexes were calculated directly,while small scale vortexes were modeled. This method not only can give more accurate overall performances,such like the separation efficiency,but also can show the details of transient turbulence flows. Therefore,more accurate and reliable trajectories of droplets can be obtained. The results obtained by large-eddy simulation are in good agreement with experiment results. Compared with results obtained by the RANS,large-eddy simulation can provide more informations on the mechanism of the corrugated plate separator which are important for optimal design of corrugated plate separators.
引文
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[3]陈韶华,黄素逸,赵绪新.波形板汽水分离器汽水两相分离机理研究[J].华中科技大学学报:自然科学版,1998,26(增刊Ⅰ):5-7.CHEN Shaohua,HUANG Suyi,ZHAO Xuxin.On separation mechanism of steam water two phase flows in a steam water separator with corrugated baffle[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,1998,26(Suppl.Ⅰ):5-7(in Chinese).
[4]田瑞峰,张志俭,陈军亮,等.波形板汽水分离器性能数值研究[J].核动力工程,2005,26(1):59-62.TIAN Ruifeng,ZHANG Zhijian,CHEN Jun-liang,et al.Study mechanism of zigzag-corrugated baffle separator[J].Nuclear Power Engineering,2005,26(1):59-62(in Chinese).
[5]张谨奕,薄涵亮,孙玉良,等.三维空间液滴运动模型[J].清华大学学报:自然科学版,2013,53(1):96-101.ZHANG Jinyi,BO Hanliang,SUN Yuliang,et al.Three-dimensional droplet motion model[J].Journal of Tsinghua University:Science and Technology,2013,53(1):96-101(in Chinese).
[6]张谨奕,薄涵亮.液滴模型在波形板汽水分离器中的应用[J].原子能科学技术,2012,46(增刊):776-781.ZHANG Jinyi,BO Hanliang.Application of droplet model in wave-type vane steam separator[J].Atomic Energy Science and Technology,2012,46(Suppl.):776-781(in Chinese).
[7]ZHANG H,LIU Q,QIN B,et al.Simulating particle collision process based on Monte Carlo method[J].Journal of Nuclear Science and Technology,2015,52(11):1 393-1 401.
[8]ZHANG H,LIU Q F,QIN B K,et al.Modeling droplet-laden flows in moisture separators using k-d trees[J].Annals of Nuclear Energy,2015,75:452-461.
[9]MARSHALL J S,LI S.Adhesive particle flow[M].Cambridge:Cambridge University Press,2014.
[10]MEI R.An approximate expression for the shear lift force on a spherical particle at finite Reynolds number[J].International Journal of Multiphase Flow,1992,18(1):145-147.
[11]YOSHIZAWA A.Statistical theory for compressible turbulent shear flows,with the application to subgrid modeling[J].Physics of Fluids(1958—1988),1986,29(7):2 152-2 164.
[12]庞凤阁,于瑞侠,张志俭.波形板汽水分离器的机理研究[J].核动力工程,1992,13(3):9-13.PANG Fengge,YU Ruixia,ZHANG Zhijian.The study of mechanism of corrugated baffles separator[J].Nuclear Power Engineering,1992,13(3):9-13(in Chinese).
[13]GALLETTI C,BRUNAZZI E,TOGNOTTI L.A numerical model for gas flow and droplet motion in wave-plate mist eliminators with drainage channels[J].Chemical Engineering Science,2008,63(23):5 639-5 652.
[14]李嘉.波形板汽水分离器的理论和实验研究[D].武汉:华中科技大学,2007.