沿程水头损失 meaning in English
friction loss of head
frictional head loss
Examples
- A new method for studying friction factor of head loss
沿程水头损失系数研究的一种新方法 - 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
摘要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。 - ( 5 ) it was more precise for using darcy - weisbach formula to calculate the hydraulic pressure slope curve in the lateral line , but too complexity . although i - pm wu formula is simple , the estimated results were not agreement with the measured data . a coefficient including irrigation uniformity was presented to modify i - pal wu formula , and the results were agreement after using the coefficient
（ 4 ）利用达西?韦斯巴赫公式计算微孔毛管的沿程水头损失具有较高的精度，但计算复杂，吴义伯公式计算虽较简单，但在灌水均匀度较差时误差较大，为此对吴义伯公式进行了修正，提出了修正系数的计算经验公式，取得了良好的结果，为简易地下滴灌工程设计中水力计算建立了简化公式。 - Corresponding to the correct water hammer mathematic model ( 3 ) , the character difference equation is by comparing the new mathematic model with the old mathematic model , the last calculative part of paper argues the falseness of the current water hammer mathematic model , makes use of the improved character line method to analyze the correct mathematic model ( 3 ) , studies all kinds of facts " impact on water hammer pressure value and water hammer phenomenon attenuation , points out that , in the long pipeline system , the subarea calculation of head loss along with flow rather influences the calculative results of water hammer pressure , advices to take the subarea calculation of head loss along with flow into account in the water hammer calculation of the long pipeline system
对应于正确的水击数学模型( 3 )的特征差分方程形式如下c ，弓+吼川一c ，唱一几弓扮几rv另卜川= o几代+吼川一几唱一吼嵘{一c :脚丸}唱} ? “本论文在最后的计算部分，通过对新老数学模型的数值计算比较，进一步论证了当前水击数学模型的不正确性。并且应用改善了的特征线法对正确的数学模型( 3 )进行了计算分析，研究了各种因素对水击压强值和水击现象衰减的影响，指出在长管道系统中，沿程水头损失的分区计算对水击压强的计算结果影响较大，建议在长管道系统的水击计算中应按分区进行沿程水头损失的计算。