The pipeline network of shengli chengdao offshore oilfield is complicated and its partial trunk pipeline segments have high pressures , which not only cause oil transmission difficulty , unstable oil well production and restricted oil output , but also have hidden troubles 摘要胜利海上埕岛油田管网复杂，部分管段干压高，不仅造成外输困难，油井生产不稳定，产量受到限制，而且还使外输存在隐患。
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。
The straight section of secondary air duct for boiler of 600 mw supercritical unit manufactured by dongfang boiler factory is shorter , at the time the measurement of air flow is being carried out by adopting velocity - equalizing tube flowmeter , the required precision can ' t be reached 摘要东方锅炉厂制造的600mw超临界机组锅炉二次风道的直管段较短，采用均速管流量计进行风量测量时，达不道精度要求。
In the end of the dissertation , a tube lifetime evaluation software system is developed with the utility of the finite element analysis stress computation and the metallographic tests . the lifetime of the platen superheater tube is evaluated by the software system 最后，综合以上应力解析法、有限元应力计算和余相试验研究开发了管件寿命评估软件系统，并使用该系统综合评估了屏式过热器管段的寿命。
In the simulation of close water test , varied profiles of velocity of flow are obtained at different leakage location along the detected pipe , the variety values of the water level in the check well are acquired with time , consequently the location of the leakage can be judged 在闭水试验时，通过模拟沿管道长度方向上不同渗水点的流速的变化，以及得出窨井出口处的水位随时间的变化值，来判断管段中最有可能出现渗漏点的位置。
It is more accurate than traditional method at the aspect of calculating head loss , pipe flow and node pressure of hydrant . this mathematic model can also be used in the inside and outside of water supply piping calculation and it is excel hardy cross - piping calculation 该方法在计算水头损失、管段流量、消火栓节点压力等方面比传统方法要更加准确，也可被借鉴到室内或室外的给水管网计算，并优于常见的哈代-克罗斯管网平差方法。
We successfully apply the two - fluid model ( tfm ) to the study of two dimensional and three dimensional dense gas - solid flow characteristics . the results show some rules on the particle collisions and gas particle interactive influence of the vertical upward pipe 在对高浓度气固两相流的研究中，成功的运用双流体模型对两维和三维垂直立管段进行了研究，揭示了垂直立管内的高浓度气固流动的颗粒碰撞以及气相和颗粒相的相互影响的一些规律。
According to the situations of flood hazards to jingbian - yanshuiguang pipeline , one of the pipeline section of west - to - east gas transmission pipeline , this paper analyzes the cause of flood hazards to this pipeline section and puts forward relative solutions 摘要结合西气东输管道靖边延水关管段汛期水毁的现场实际，分析了汛期间雨水冲沟、落水洞和局部塌陷等现象出现的原因，阐明了由此引起的对管道安全的影响和危害，并提出了相应的预防和防治措施。
The knowledge can resolve the problem of the optimum layout of city natural gas pipeline network system . the hydraulic calculation and the optimization of the pipe diameter design were solved as well . from setting up mathematical model solving the models were expounded elaborately in this paper 本论文从建立数学模型到模型的解法都作了详尽的阐述，较好地解决了城市天然气管网布局最优化问题和(各节点)压力、 (各管段)流量及管径等参数的设计问题。
Five typical examples are given and the results indicate that : the system can decompose a complicate problem to different agents and search the resolution cooperatively in order to reducing the complexity . it can distribute intelligently and control automatically the tube - flow for different types of pipeline network quickly and accurately . it can estimate the total supply more accurately by getting users " needs at different moment autonomously , then can control the supply of each water - source 本文给出了五个典型的仿真实验，结果表明：该系统能把问题分布到不同主体上进行合作求解，从而降低问题的复杂度；可以快速准确地实现各种类型自来水管网中各管段流量的智能分配与自动控制；可以通过主动地获取用户不同时刻的需求比较准确地估算总供水量，实时控制各水源主体的生产量，达到较经济运行的目的；可以在保证各管段最大流量等约束条件的前提下，尽可能地满足不同优先级别用户的需求；还可以根据运行结果起到辅助管网设计、防止和发现管网故障的作用。
