三元流场中速度梯度方程的分析

The analysis of velocity gradient equation in three dimensional flow

以准正交面法求解三元流场的理论为基础，依据实际计算模型，提出了水力机械流场计算中的速度梯度方程在曲线坐标系下计算的思路，给出了计算表达式．并通过空间点源的计算实例，对数值解与解析解做了比较，证明本文所提出的计算方法是可靠的．

Based on the theory of quasi orthogonal surface method and according to the calculating model of the practical hydraulic machinery flow field, a way to compute the velocity gradient equation is given in curvilineal coordinates. Comparing the numerical results with the analytical results obtained by applying this method to a flow field induced by spacial source, we can find that presented method is reliable.