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A Numerical Study on the Supersonic Steam Ejector Use in Steam Turbine System

机译：汽轮机系统中超音速蒸汽喷射器使用的数值研究

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摘要

Supersonic steam ejector is widely used in steam energy systems such as refrigeration, wood drying equipment, papermaking machine, and steam turbine. In this paper the Computational Fluids Dynamics (CFD) method was employed to simulate a supersonic steam ejector, SST k-w turbulence model was adopted, and both real gas model and ideal gas model for fluid property were considered and compared. The mixing chamber angle, throat length, and nozzle exit position (NXP) primary pressure and temperature effects on entrainment ratio were investigated. The results show that performance of the ejector is underestimated using ideal gas model, and the entrainment ratio is 20％-40％ lower than that when using real gas model. There is an optimum mixing chamber angel and NXP makes the entrainment ratio achieve its maximum; as throat length is decreased within a range, the entrainment ratio remains unchanged. Primary fluid pressure has a critical value, and the entrainment ratio reaches its peak at working critical pressure; when working steam superheat degree increases, the entrainment ratio is increased.
机译：超音速蒸汽喷射器广泛用于蒸汽能源系统，例如制冷，木材干燥设备，造纸机和蒸汽轮机。本文采用计算流体动力学（CFD）方法对超音速蒸汽喷射器进行了模拟，采用了SST k-w湍流模型，并考虑了真实气体模型和理想气体模型的流体性质。研究了混合室角度，喉管长度和喷嘴出口位置（NXP）的主压力和温度对夹带率的影响。结果表明，理想气体模型对喷射器的性能低估，夹带率比真实气体模型低20％-40％。有一个最佳的混合室角度，恩智浦使夹带率达到最大。当喉长在一定范围内减小时，夹带率保持不变。一次流体压力具有临界值，在工作临界压力下夹带率达到峰值。当工作蒸汽过热度增加时，夹带率增加。

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  • 来源
    《Mathematical Problems in Engineering》 |2013年第1期|651483.1-651483.9|共9页
  • 作者

    Lin Cai; Miao He;

  • 作者单位

    China Ship Development and Design Center, Wuhan, Hubei 433064, China;

    China Ship Development and Design Center, Wuhan, Hubei 433064, China;

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