1) flow resistance
水流阻力
1.
Started from the energy balance equation of silt laden flow,there are two aspects that the silt movement influences on the flow resistance:(1)decrease of resistance caused by reduction of Karman s constant;(2)increase of resistance caused by the bed load movement.
两者对阻力的作用正好相反 ,因而挟沙水流阻力比清水可能减小、增大及不变 ,取决于两者的对比程度。
2.
In order to study the mechanism of flow resistance exerted by vegetation in open channel, vegetation rigidity has been researched and a dimensionless number, F, was introduced to describe vegetation ability to resist bending in this paper.
为研究明渠中植被阻水机理,本文选择植被刚度为对象,引入一个用于表征植被抵抗弯曲能力的无因次数F,通过物理实验、PIV测量和数值模拟计算等研究手段,研究淹没状态下植被刚度对水流阻力特性所造成的影响。
2) hydraulic resistance
水流阻力
1.
Effects of different root zone irrigation modes on apple seedlings hydraulic resistance
根区不同灌溉方式对苹果幼苗水流阻力的影响
2.
This paper was concerned with analyzing quantitatively the magnitude, the variation, and the relative importance of each water potential and hydraulic resistance in latored soil mango atmosphere continuum in slope land, based on the experimental data obtained in the mango plant field and on the electrical analog principle of water flow.
依据田间实测资料,运用水流的电模拟原理,定量分析了坡地赤红壤—芒果—大气连续体水分运移过程中水分势能和水流阻力各分量的大小、变化规律及其相对重要性。
4) hydraulic resistance
流动阻力,水力阻力,水阻
5) fliiding port resistance
流水孔阻力
6) flood port resistance coefficient
流水孔阻力系数
1.
This effect of pressure gradient on flood port resistance is studied,orthogonal and uniform design methods are used to draw up the calculation schemes,two empirical equations for flood port resistance coefficient are presented by way of stepwise regression.
本文研究了压力梯度对于流水孔阻力的影响,采用正交设计与均匀设计方法编排了流水孔阻力系数的计算方案,将计算结果逐步回归,给出了流水孔阻力系数的经验估算公式,并用某型实艇流水孔作算例,验证了回归公式的实用性,发展了预报潜艇流水孔补贴系数的新方法。
补充资料:水流阻力
水流阻力
hydraulic resistance
物面(沿程)阻力它与物面状况(壁面糙度k.),当地流速(V),水力半径(R)和流程长度(L)及重力加速度(g)有关,在水力学中用沿程水头损失h,表示,即其中,局部水头损失系数夸因具体形状而不同,通常由实脸侧定。水中运动的物体、水工建筑物中的闸墩,因绕流边界层分离形成尾流,产生很大的压差阻力FD,表示为 ,L‘Vz。了一‘获X而。_。PVZ。,fD一‘O一下万~广Jl ‘式中阻力系数几是雷诺数(Re)和壁面相对糙度(k./刀或毛/R)的函数,孟=f(Re,h./D)由管道(直径D)中进行的系统性实验资料给出,如图1。阻力系数式中A为与运动方向正交的物体投影面积,几为形状阻力系数.几种典型物体三维绕流情况下的cD值如图2。物体(如船舶)在水面运动产生波系引起的阻力,称古截城只目劣映孟视水流流态是层流还是紊流而不同,紊流状态又分为水力光滑、水力粗橄和过波区3种情况,见表。物面阻力有时用边壁阻力r0表示,它与浇的关系是PV、一co 一一 r0 明朵水力学计算常用谢才(Chezy)系数C表示河集阻力,它与孟的关系是。
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参考词条