| 1. | Actually , in the tube engineering , the proportion of the loss of local water head in the loss of pipeline water head is big
在实际管道工程中,阀门阀道的局部水头损失占管路水头损失的比例是相当大的。 |
| 2. | These phenomenon jeopardize the condition of the project seriously , and it is the main factor that influences the loss of local water head
这些现象严重危害管道的工况,并且是影响阀道局部水头损失的主要因素。 |
| 3. | The article builds up computer module of hydraulic computation : computation module of point measuring method , of area method , of the loss in head of part and of result show
建立了水力计算计算机模块：逐点法计算模块、面积法计算模块、局部水头损失计算模块和结果显示模块。 |
| 4. | Ulteriorly , considering the local head loss in inlet opening and pipes junction plays more important role in the calculative results of water hammer pressure calculation of the short pipeline system
考虑进口及多管道连接处的局部水头损失对短管道系统水击压强的计算结果影响较大。 |
| 5. | The value of correction coefficient of kinetic energy increases as a result . the water surface profiles of flume experiments are computed by three different methods : adjusting the local head loss coefficient , deduction of backwater area , and application of backwater expression
随后结合实测水位资料，通过采用调整局部水头损失系数、扣除回水面积以及壅水公式等不同的水面曲线计算方法对实验水槽一维水面曲线进行计算。 |
| 6. | The mathematical analysis shows that , with disregarding local head losses and by means of different simplified rigid models , the calculated results of the maximum pressure in a pressurized pipe system containing trapped air mass are equal to and independent of the initial length of the water - column
摘要通过数学分析证明，在不计局部水头损失时，目前常用的几种简化刚性数学模型的最大气压计算结果相等，并与管道内初始充水段长度无关。 |
| 7. | 2 . based on the results of experimental data of the tailrace surge tank of yi xing pumped - storage station in jiangsu province , this research investigates the methods for the head loss coefficients of throttled surge tank with linking pipe by means of the method which incorporates experimental results with theoretical analysis
结合江苏宜兴抽水蓄能电站尾水调压室水力模型试验成果，采用理论计算与模型试验结果相结合的方法，对有连接管的阻抗式调压室局部水头损失系数的计算方法进行了讨论。 |
| 8. | Comparison of water level between measured and computation shows that the local head loss coefficient cannot give head loss by spur dike completely , and the effective area of passage is difficult to be ascertain . for this reason the two methods for water surface profile computation cannot predict the raise of water level upstream the spur dike accurately
计算结果表明，局部水头损失系数并不能完全反映出由于丁坝阻挡所带来的水头损失，而丁坝附近的有效过水面积难以准确地确定，这些导致前两种方法均不能很好地计算出丁坝上游水位的壅高值。 |
| 9. | 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 |
