下水头 meaning in Chinese

xiashuitou

Based on the head loss coefficients obtained from gardel ' s semi - empirical equations for t - junction flow and experiment of welded t - junction , the hydraulic characteristics of throttled surge tank are estimated and compared with those gotten from hydraulic experiment . 3 . four different methods of determining the head loss coefficients of throttled surge tank have been employed to investigate the effect of methods afore mentioned on the accuracy of calculating surge and pressure head of throttled surge tank
给出了基于gardel关于三通管水头损失系数的经验公式、焊接t形三通管水头损失系数的实验资料及截面突变管道的水头损失资料，计算有连接管的阻抗式调压室在不同流态下水头损失系数的计算方法，并将这两种方法计算得到的调压室局部水头损失系数分别与模型试验成果进行了比较和分析； 3