Using porous discs to simulate horizontal axis tidal turbines is a simple and stable method. They generate a similar wake field as turbine, but ignore some of the scaling issues and mesh density in CFD calculations. Calculations of the paper based on commercial software Ansys CFX, and comparing the wake field between porous disc and turbine. With similar values of disc thrust coefficient (CT), the result shows that CFD disc model gives reasonable agreement with CFD turbine model, especially for the field which is out of disc area. This paper confirm that the method of using porous discs model to simulate tidal turbine wake is reasonable, and analysis the interaction between each turbine in a tidal array by using this method.%运用多孔圆盘模型来模拟水平轴潮流水轮机，进行水轮机流场研究，该方法相对简单且可靠。在不考虑模型缩放比例问题和CFD模型多孔圆盘网孔密度的条件下，多孔圆盘可以产生与水轮机相似的尾流场。本文运用商业软件Ansys CFX对多孔圆盘和水轮机流场进行模拟，对比多孔圆盘和水轮机的尾流场。对比结果表明，在保证CT值相等条件下多孔圆盘尾流场与水轮机尾流场基本相似，尤其是迎流面外的区域，验证了采用多孔圆盘模型来模拟水平轴潮流水轮机方法的可行性；并采用该方法研究了水轮机阵列布置时水轮机之间流场相互干扰的基本特征。
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