【作者】 黄明；

【导师】 刘文斌； 管延文；

【作者基本信息】 华中科技大学 ， 建筑与土木工程， 2013， 硕士

【摘要】 由于枝状高压燃气管网中的气体水力参数是随着时间动态变化的，因此对非稳态条件下燃气管网的水力特征计算尤为重要。动态流动较复杂，一般需要借助于计算机求解。本文正是基于此需要开发枝状高压天然气管网动态分析软件。文章先对本仿真课题做了非功能性的需求分析，紧接着立足于核心功能性需求分析进行了说明。以框图的形式介绍了本仿真系统的结构组成和功能模块，此外，开发了本系统的人机对话界面，以满足用户和系统之间的数据交换。文章利用图论知识，基于节点和管道关联矩阵A的生成方法，自动地实现了将管网的结构图用计算机语言的表达。用户使用时只需要输入管道编号和与管道相关联的起点节点、终点节点的编号，即可自动生成燃气管网。以流体的连续性方程、动量方程和状态方程为基础建立准确的管网仿真数学模型，并根据本系统的开发需求，提出了动态模型的简化方法，得到简化的动态分析数学模型。对简化后的数学模型，采用隐式差分格式数值求解。该方法对时间步长要求不严格、稳定性好。并利用编程软件，以单根高压燃气管为例对该数学模型进行了误差分析。根据本仿真系统的开发需求，规定了系统的初始条件和边界条件，并给出了求解方法。综合应用初始条件、边界条件、高压管网燃气流动基本方程和隐式差分格式的抛物型动态模型，采用牛顿-拉夫森法求解节点流量平衡的非线性方程，并给出计算求解的流程图。接着以枝状管网为例，将本仿真系统计算出的数据和英国ESI公司开发的pipeline studio for gas tgnet软件计算出的数据进行对比分析，以证明本系统的精度和可靠性。文章最后论述了本仿真系统在管道储气调峰和SCADA系统中的应用。更多还原

【Abstract】 Due to the fact that various parameters of the gas pipe network is changing all thetime, it is particularly important to hydraulic analysis under the dynamic condition of pipenetwork. Dynamic flow is comparatively complicated, normally need computer to solve it.This dissertation is based on the need to develop dendritic high-pressure natural gaspipeline network dynamic analysis software.This article first makes the requirement analysis about this non-functional simulatesubject, following by illustrating the analysis based on the core function. The form ofblock diagram is introduced in order to show the structure and the functional modules ofthis simulate system, furthermore, the man-machine dialogue interface of this system isdeveloped, in order to meet the data exchange between users and system.Using the graph theory knowledge as well as the generation method which based onthe node and pipeline connection matrix A, the network diagram can be expressed byinternet automatically. Users only need to input pipe number and associated pipe startnode, end node number, the pipe network can automatically generated.Taking advantage of the fluid continuity equation, momentum equation and stateequation as foundation, this dissertation set up accurate simulated pipeline model.According to the develop requirements of this system, the author proposed the simplifiedmethod of dynamic model and get the simplified mathematical model of dynamic analysis.According to the develop requirement of this simulation system, the initial andboundary conditions are formulated and the solving method is given. This articleintegrated applying initial conditions, boundary conditions, the basic gas flow dynamicequation model and difference scheme dynamic model, with the help of Newton Raphs-on technique, the nonlinear equations can be solved, the flow chart can be settled by thecalculation as well. Then set the dendritic pipeline network as an example, by comparing the data from this simulated system with the pipeline studio for gas tgnet software’s datewhich developed by the English ESI company, the accuracy and reliability of this systemcan be proved. Finally, the application of the simulated system in the pipeline gas peakshaving and SCADA system are discussed.更多还原