法向外推方法生成的内层代数网格能够保证在物面附近的网格具有很好的正交性，并可控制第一层网格至物面距离；

The inner-layer grid generated with the algebraic method is orthogonal and easy to control the distance to the wall.

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结果表明：壁面处网格正交性对附面层内流动计算预测精度影响较大，而对势流区流动影响很小；

The investigation demonstrates that the intersection angles of grid lines at solid walls have significantly influence on the predicted results in the boundary layer regions;

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