摘要
按不同流态及流区对明渠水流阻力系数的计算公式进行了归纳和总结。以实测资料为依据 ,利用不同的阻力系数计算公式按明渠均匀流理论分别计算了实际输水明渠的过流能力 ,并将计算流量与实测流量进行对比 ,其相对误差在 - 7.9%～ 2 .6 8%之间。其中 ,以紊流粗糙区的指数型公式和对数型公式的相对误差为小 (- 2 .0 %～2 .6 8% )。在粗糙系数一定的条件下 ,不同阻力计算公式求得的阻力系数相差不大。从工程实用和计算方便的角度考虑 ,指数型公式较其它形式有更好的适应性 ,其计算的精确性往往取决于粗糙系数n的选择 。
The calculation formulas of the resistance coefficient in open channel flows were summarized according to different flow patterns and flow regions.On the basis of the actual experimental data and by using the different calculation formulas as well as from the theory of uniform flow in open channel,the flow capacities of the open channel were calcuated respectively.The calculated discharges are compared with the measured discharges,the relative errors are between -7.9% and 2.6% ,but the errors obtained from the formulas of index form and logarithem form are smaller(between -2.0% and 2.68% ).With a given roughness factor,the differences of the resistance coefficients calculated using different resistance calculation formulas are small.Considering the engineering application and calculation convenience,the formula of index form has a better adaptability,and calculated precision mainly depends on the selection of roughness coefficient n .Employing rough region formulas to calculate the discharges of transition rough region still have better results.
出处
《长江科学院院报》
CSCD
北大核心
2002年第2期15-18,共4页
Journal of Changjiang River Scientific Research Institute
基金
浙江水利水电专科学校科研经费支助项目
关键词
明渠水流
阻力系数
计算公式
粗糙系数
open channel flow
resistance coefficient
calculation formula
