模拟结果同时证实，除非水均衡误差也相当小，否则水头变化收敛指标较小时收敛的计算也不能保证计算结果有可靠的精度。
Verified by simulation results reliable accuracy of calculated results can not be guaranteed for small head change convergence index unless the error of water balance is small too.
对于速度边界层提出了相似性解的解析结果，给出了速度分布、边界层厚度、摩擦阻力和水头损失的解析计算表达式。
Calculation formula of velocity distribution, boundary layer thickness, friction force and loss of water head are given out, in accordance with the result from theory analysis of similitude solution.
并对收缩段水头损失的计算公式进行修正。
The formula to calculating head losses in the contraction section were revised.
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