During the hydraulic calculation on pipeline network , it is unacceptable to neglect local energy loss or to adopt constant local energy loss coefficients 进行管网水力计算时,忽略结点处的局部能量损失或采用不变的局部能量损失系数均是不合适的。
The study result also shows that there is significant energy exchange between all the pipe sections connected to the same junction , therefore , those flow phenomenon can not be accurately reflected if neglecting or adopting the constant energy loss coefficients 研究结果还表明,与同一结点相接的各管段间存在显著的能量交换,因此,忽略或采用恒定不变的能量损失系数均不能正确地反映这些水流现象。
A calculation comparison on the pipeline network system consisting of pipe sections of short length is made herein with three calculation methods respectively , i . e . neglecting the local energy loss at junctions ; adopting constant local energy loss coefficients and the semi - empirical relationships based on experimental data related to the flow conditions , from which the calculated results for the flow rates of the pipe sections are largely deviated 文中分别应用三种计算方法,即忽略结点处局部能量损失、采用恒定不变的结点局部能量损失系数,以及根据试验成果所得的与水流条件有关的半经验公式,针对短管段构成的管网系统进行了计算比较,管段流量的计算结果相差很大。
From this point of view , a general analytic expression for the coefficient of local energy loss was presented based on the principle of hydrodynamics , together with experiments on particular flow characteristics and energy dissipation mechanism at right - angle junctions , and the expression was validated with the experimental data 为此,根据水动力学基本原理,在分析90汇流口独特水流特性及能量耗散机理的基础上,提出了局部能量损失系数的综合表达式,并应用试验资料对该综合表达式进行了验证。
能量: energy; amount of energy损失系数: loss coefficient集热器总能量损失系数: collector overall energy loss coefficient无能量损失系统: nrs光损失系数: light loss factor, llf; light loss factor/llf/maintenance factor损失系数: lo coefficient; loss coefficient; loss factor能量损失: energy degradation; energy import; energy loss; energy waste; engine loss; expenditure of energy; loss in energy; lost energy能量损失率: rate of energy loss能量损失谱: energy loss spectroscopy; energy loss spectrum磁心损失系数: magnetic core loss factor磁滞损失系数: coefficient of hysteresis进气损失系数: air intake loss coefficient炉墙损失系数: wall loss parameter摩擦损失系数: friction lo coefficient; friction loss coefficient; friction loss factor喷嘴损失系数: coefficient of nozzle loss入射损失系数: incidence loss coefficient压力损失系数: pressure drop coefficient; pressure loss coefficient; pressure loss factor翼尖损失系数: tip-loss factor引射损失系数: ejector-loss coefficient总压损失系数: total-pressure loss ratio电离能量损失: iel对数能量损失: lethargy; logarithmic energy loss贯穿能量损失: pentration energy loss进口能量损失: entrance loss净能量损失率: net rate of energy loss