自压软管沿程压力水头分布研究

根据水力学原理建立了软管沿程水头损失的一般方程,得出了软管沿程压力水头的计算公式,给出了确定最大和最小压力水头位置及大小的方法,从计算结果与试验实测结果的对比看,具有一定的合理性。计算公式在与试验条件类似或基本一致的条件下可以用于实际计算,为判断软管滴头出流能否满足流量允许偏差率或计算微灌均匀系数提供了依据。

Study on pressure head distribution along the gravity flexible hoses

Based on the principle of hydraulics,the general equation for head loss and the formula for calculation of pressure head along the flexible hoses were worked out,and the method for determination of the maximum and minimum heads and their positions was given.The comparison of the calculated results with the measured data demonstrates that the method is of certain reasonability,and can be used for practical calculation under the condition that is similar to or accords with the experimental condition,providing a basis for judgment of whether the outflow from droppers of flexible hoses can meet the allowable deviation ratio of flow rate and for calculation of the uniformity coefficient of micro-irrigation.