船用低温蒸馏海水淡化装置二级引射器的数值模拟
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摘要
目前船用蒸馏海水淡化系统中,为减小装置体积并实现系统节能目标,引射器通常需要同时具有抽气和抽水功能,而传统的单级引射器只能形成单一真空度,从而影响淡水产率。文章提出了一种二级双吸口引射器设计方案,通过对引射器的流场特性进行数值模拟,分析结果表明入口流速和压力升高有利于提高真空度,而出口压力升高则会降低真空度。实验结果显示,在流速大于3.5 m/s时,模拟结果与实验数据基本一致,引射器吸口真空度可达到92%和90%,满足了船用引射器性能要求。
In current marine low-temperature distillation seawater desalination plant, an ejector is designed to pump gas and water synchronously so as to reduce device size and energy consuming. In this paper, an ejector design scheme with two stages was investigated. Flow fi eld characteristic of the proposed ejector was simulated to demonstrate that this design could increase inlet fl ow velocity and pressure which in turn could improve inlet vacuum and decrease vacuum. Real experiments were also carried out to validate the simulated results. The experimental results show that, when the fl ow velocity is larger than 3.5 m/s, vacuum at ejector suction can reach 92% and 90% respectively and meet the performance requirements of marine ejector.
In current marine low-temperature distillation seawater desalination plant, an ejector is designed to pump gas and water synchronously so as to reduce device size and energy consuming. In this paper, an ejector design scheme with two stages was investigated. Flow fi eld characteristic of the proposed ejector was simulated to demonstrate that this design could increase inlet fl ow velocity and pressure which in turn could improve inlet vacuum and decrease vacuum. Real experiments were also carried out to validate the simulated results. The experimental results show that, when the fl ow velocity is larger than 3.5 m/s, vacuum at ejector suction can reach 92% and 90% respectively and meet the performance requirements of marine ejector.
引文
[1]Cunningham RG.Liquid jet pumps for two-phase flows[J].Journal of Fluids Engineering,1995,117(2):309-316.
[2]Senthil Kumar R,Kumaraswamy S,Mani A.Experimental investigations on a two-phase jet pump used in desalination systems[J].Desalination,2007,204(1-3):437-447.
[3]Lu X,Wang D,Shen W,et al.Experimental investigation on the performance of improving jet pumpcavitation with air suction[J].International Journal of Heat and Mass Transfer,2015,88:379-387.
[4]Yuan G,Zhang L,Zhang H,et al.Numerical and experimental investigation of performance of the liquid-gas and liquid jet pumps in desalination systems[J].Desalination,2011,276(1-3):89-95.
[5]王东波,陈金增.MSF海水淡化装置喷射器性能分析[J].舰船科学技术,2013,35(10):122-125.
[6]Xiao L,Long X.Cavitating flow in annular jet pumps[J].International Journal of Multiphase Flow,2015,71:116-132.
[7]王晓娟,张博,高春林,等.船用真空海水淡化装置液-汽引射器的数值模拟及试验研究[J].热能与动力工程,2011,26(6):700-704.
[8]陆宏圻.喷射技术理论及应用[M].武汉:武汉大学出版社,2004.
[2]Senthil Kumar R,Kumaraswamy S,Mani A.Experimental investigations on a two-phase jet pump used in desalination systems[J].Desalination,2007,204(1-3):437-447.
[3]Lu X,Wang D,Shen W,et al.Experimental investigation on the performance of improving jet pumpcavitation with air suction[J].International Journal of Heat and Mass Transfer,2015,88:379-387.
[4]Yuan G,Zhang L,Zhang H,et al.Numerical and experimental investigation of performance of the liquid-gas and liquid jet pumps in desalination systems[J].Desalination,2011,276(1-3):89-95.
[5]王东波,陈金增.MSF海水淡化装置喷射器性能分析[J].舰船科学技术,2013,35(10):122-125.
[6]Xiao L,Long X.Cavitating flow in annular jet pumps[J].International Journal of Multiphase Flow,2015,71:116-132.
[7]王晓娟,张博,高春林,等.船用真空海水淡化装置液-汽引射器的数值模拟及试验研究[J].热能与动力工程,2011,26(6):700-704.
[8]陆宏圻.喷射技术理论及应用[M].武汉:武汉大学出版社,2004.