The main strategy should include in itself the use of three-dimensional flow theory, improvement of vanes stacking skill, control of hydraulic losses, and use of CFD in vane design procedure.

采用三维流动理论，改变叶片造型方法，控制水力损失和引入CFD方法是提升现有轴流泵叶片设计的主要策略。

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In order to obtain transient mathematical model as vectoring deflection which is very important in engineering and valuable in theory, three-dimensional and unsteady flow fields must be researched.

由于气流在喷管流动中具有复杂的三维非定常的特征，因此，建立其动态数学模型有着更为重要的工程及理论价值。

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From the plastic flow theory, the three-dimensional deformations and stresses of the deformation zone are formulated.

根据塑性力学流动理论，分析推导了变形区三维变形和应力的数学模型。

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