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local loss     
相关语句
  局部损失
     Study on Local Loss Based on CFD
     基于CFD的局部损失探讨
短句来源
     Then, while local resistance of three-way pipe applying to hydraulic computation of the pipe network , draw : (1) Hydraulic computation in large-scale water supply pipe network ( l / d ≥1000) , some local loss comparing with head loss, Its value is relatively small, can be ignored in engineering calculation;
     接着,把三通的局部阻力引进管网的水力计算中,得出:(1)在大型管网即l / d ≥1000以上的给水管网计算中,局部损失和水头损失相比,其值相对较小,在工程计算中可以忽略不计;
短句来源
     The efflux element solely serving as the study subject and on condition that the linear loss and the local loss are ignored, the paper applies the Berloulli equation to conclude the calculation result, which shows that the cavitation corrosion exists in the inside of the efflux element at certain discharge of pump in theory, and the theoretical analysis consists with the actual condition.
     单独以射流元件作为研究对象,在忽略沿程损失及局部损失的条件下,应用伯努利方程计算结果说明,空化在理论上在一定的泵量下在射流元件内部存在,理论分析与实际现象一致。
短句来源
     Numerical Simulation of Local Loss of Expanding or Reducing Duct in Highway Tunnel
     公路隧道扩(缩)径风道局部损失数值模拟
短句来源
     Furthermore, an improved genetic algorithm is introduced to optimize the roughness, the revised coefficient of energy or the synthesis coefficient of local loss, which makes the parameter more reasonable.
     通过改进的遗传算法对糙率、局部损失系数或综合局部系数等进行优化选择,使参数选择更加合理.
短句来源
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  局部阻力
     The local loss coefficient at sudden expansion ξ\-1=1-A\-1A\-22 is determined by the theory.
     突然扩大局部阻力系数ξ1=1 - A1 / A2 2是通过理论确定的。
短句来源
     In the paper, the local loss coefficient at sudden expansion under the condition of three kinds of A\-1A\-2 is studied by experiment. In the end, the result shows that ξ\-1 is related not only to two flow cross sections, but also to the velocity.
     通过对三种 A1 / A2 情况下的局部阻力系数的实验研究 ,结果发现ξ不但与两过流断面有关 ,而且还和流速有关。
短句来源
     During the design of pipe, the determination of local loss coefficient is often come across.
     在管道设计中 ,经常遇到局部阻力系数确定的问题。
短句来源
     Then, while local resistance of three-way pipe applying to hydraulic computation of the pipe network , draw : (1) Hydraulic computation in large-scale water supply pipe network ( l / d ≥1000) , some local loss comparing with head loss, Its value is relatively small, can be ignored in engineering calculation;
     接着,把三通的局部阻力引进管网的水力计算中,得出:(1)在大型管网即l / d ≥1000以上的给水管网计算中,局部损失和水头损失相比,其值相对较小,在工程计算中可以忽略不计;
短句来源
     Pressure distributions along convex side of wall are more even and maximum pressure gradient on there appears later than along concave side of wall as the local loss coefficients for fronter are lower than later. Test data shows good agreement with calculating results discoverd subsequently.
     结果表明:沿凸壁面的边界层流动与沿凹壁面的边界层流动具有不同的发展规律,凸壁面上的压力分布比四壁面情况下要平缓些,最大压力梯度出现得也更迟,此外,凸壁画上的壁面局部阻力系数也比相应的凹壁面为低,这说明了凸壁面上的边界层流动比较稳定。
短句来源
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  局部水头损失
     3)It decreases the local resistant coefficient and the local loss of water head. 4)It improves the distribution of pressure on the runner. 5)It makes the flow more even in each multi-ingate with equal cross section.
     (3)减小直一横浇道拐弯的局部阻力系数和局部水头损失,(4)明显地改善了横浇道的压力分布特性,(5)使相等截面的多内浇道的流量更为均匀。
短句来源
     Based on experimental analysis and theoretical discussion of local loss coefficient ξ in sudden enlargement circular pipe,a usable equation was suggested which had an additional correction coefficient.
     以圆形管路的突然扩大为例,对管路的局部水头损失系数ξ作了实验、分析和理论探讨,得出比较切合实际的计算公式。 本文得出的ξ计算公式比原来的计算公式多了一个修正系数
短句来源
  “local loss”译为未确定词的双语例句
     Discussion on Local Loss and Heat of High Power and Frequency Transformer Tank
     大功率高频变压器油箱局部损耗发热的探讨
短句来源
     MPEG-4 multicast model of application based on RTP-packets' local loss recovery
     基于RTP包本地丢失恢复的MPEG-4多播应用模型
短句来源
     Experimental Study on the Local Loss of Oil Mist
     油雾润滑中局部油雾损失实验研究
短句来源
     RMTP is a reliable multicast protocol based on local loss recovery through repair servers.
     RMTP(reliable multicast transport protocol)是一种通过修复服务器(repair server)本地恢复来提供可靠性的组播协议.
短句来源
     In some practice, only it's ratio of double-end cross-sections and diffuser angle are considered, but the states of flow are ignored. In this aspeet, this article gives overall consideration and made special experiments at the pipeline with 5·7° diffuser angle and 0.25 cross-se(tior) ratio and measured local loss coefficienf of diffuser in different state of flow, that gives the basis for pipeline designing.
     在现有的资料中只考虑到它的扩散角及扩散段两端面积之比,而没有考虑到水的流速,本文进行了全面考虑,在扩散角为5.70°,面积之比为0.25的管路上进行了实验,测出了不同流速下的渐扩段阻力系数,为管路设计提供了依据
短句来源
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  local loss
The phenomenon of the local loss of stability (buckling) earlier discovered by the authors experimentally was simulated theoretically.
      
Shells in the second group have ω>amp;gt;1, which characteristically manifest a local loss of stability.2.For shells with L≤2D, the critical loads PK are practically identical for single-sided and through holes.
      
The effect of occurrence of a local surface phase transformation is predicted, which is caused by a local loss of stability of the statistical distribution of atoms of components on the surface due to the presence of interstitial impurity atoms.
      
Results indicate that local loss measurements can be performed on fibre sections which are remote from the source by a distance corresponding to a fibre attenuation of 27 dB.
      
Stress redistribution in a composite material upon a local loss of plastic stability of the fibers
      
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In order to disclose the effect of sprue—down—well,this article states a research on the pouring tests of two kinds of hydraulic models for comparision by means of hydraulic simulating method.One of them has sprue—down—well,but the other has none.It is found that there are some important effects occurred in a good sructural sprue—down—well.as following: 1)It produces a cttshioning effect at the bottom of the sprue. 2)It shortens the transition region of turbulization,Which occurs at the corners of the sprue—runner....

In order to disclose the effect of sprue—down—well,this article states a research on the pouring tests of two kinds of hydraulic models for comparision by means of hydraulic simulating method.One of them has sprue—down—well,but the other has none.It is found that there are some important effects occurred in a good sructural sprue—down—well.as following: 1)It produces a cttshioning effect at the bottom of the sprue. 2)It shortens the transition region of turbulization,Which occurs at the corners of the sprue—runner. 3)It decreases the local resistant coefficient and the local loss of water head. 4)It improves the distribution of pressure on the runner. 5)It makes the flow more even in each multi-ingate with equal cross section. This paper also gives a brief description of the view of some foreign researchers.We make some necessary analysis of the effect mechanism of sprue—down—Well.

为了揭示直浇道凹井(直浇道窝)的作用,本文介绍了应用水力挂拟法研究有、无直浇道下凹井的两组试验模型的对比充填试验。发现结构正确的直浇道下凹井有以下几点重要作用:(1)减轻对直浇道底部的冲击,育明显的缓冲作用;(2)它缩短了直一横浇道拐弯的流股的严重紊流的过渡区,有减少开;成二次氧化央渣的倾向;(3)减小直一横浇道拐弯的局部阻力系数和局部水头损失,(4)明显地改善了横浇道的压力分布特性,(5)使相等截面的多内浇道的流量更为均匀。文中还简要介绍了国外研究者的看法。对于直浇道下凹井的作用机理作了必要的分析和解释。

The double sweeping method is a simple and effective for numerically solving Saint-Venant eqs. in implicit scheme. In natural rivers it is quite often that the conditions of concentritive lateral flow, pond connectted with main channles, local loss of water head, sluice etc. shoud be taken into consIderation, the double sweeping method easily solve these problems in computation by means of adding a computational reach.This additional reach should be the same as the normal reach. but its coefficients are...

The double sweeping method is a simple and effective for numerically solving Saint-Venant eqs. in implicit scheme. In natural rivers it is quite often that the conditions of concentritive lateral flow, pond connectted with main channles, local loss of water head, sluice etc. shoud be taken into consIderation, the double sweeping method easily solve these problems in computation by means of adding a computational reach.This additional reach should be the same as the normal reach. but its coefficients are determined by their special connection conditions.The double sweeping method also can be easily applied to compute the unsteady flow in networks of channels.

双消除法(追赶法)是数值求解圣维南方程组隐式差分格式的一种较简便的方法,要求计算机内存少,计算速度快,並易于掌握.用双消除法来处理天然河道中常见的集中旁侧入流、与主河道连通的蓄水洼地、集中水头损失及闸、堰、泵站等问题时,只需增加一个虚拟河段.在求解过程中,虚拟河段与一般河段一样,所不同的是其中的追赶系数由连接条件(内边界条件)所决定.双消除法也可方便地推广应用于河网非恒定流计算.笔者在求解上海黄浦江流域模型中运用双消除法取得了较为满意的结果.

Two dimensional internal flow near a curved wall with positive pressure gradient is discussed in this paper based on boundary-layer theory. A technical approach for calculating development of turbulent boundary-layer is presented and its test data are also given. Theoretical calculations and analyses had compared with test results measured in lab. Under three different flow inlet cases shows that the development of boundary layer near convex side of wall are differ from the one near concave side of wall. Pressure...

Two dimensional internal flow near a curved wall with positive pressure gradient is discussed in this paper based on boundary-layer theory. A technical approach for calculating development of turbulent boundary-layer is presented and its test data are also given. Theoretical calculations and analyses had compared with test results measured in lab. Under three different flow inlet cases shows that the development of boundary layer near convex side of wall are differ from the one near concave side of wall. Pressure distributions along convex side of wall are more even and maximum pressure gradient on there appears later than along concave side of wall as the local loss coefficients for fronter are lower than later. Test data shows good agreement with calculating results discoverd subsequently. Brief introducing about the experiment set and test way are also included.

本文利用边界层理论对二维曲壁扩压流道内部的气流流动规律进行了初步的研究。主流流场的计算采用了时间推进有限面积元方法,然后用BOX差分格式对边界层方程进行数值求解,并且在紊流切应力模式中考虑了壁面曲率的影响,由此得到流道两壁上边界层流动沿流动方向上的发展规律,最后通过三个不同来流条件的实验测量,对理论计算和分析进行了验证。结果表明:沿凸壁面的边界层流动与沿凹壁面的边界层流动具有不同的发展规律,凸壁面上的压力分布比四壁面情况下要平缓些,最大压力梯度出现得也更迟,此外,凸壁画上的壁面局部阻力系数也比相应的凹壁面为低,这说明了凸壁面上的边界层流动比较稳定。对于壁面曲率比较大的弯曲流道来说,在边界层的计算中应考虑到曲率的影响。

 
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