枝状高压天然气管网动态分析及软件开发
发布时间：2019-04-04 13:06
【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。
[Abstract]:Because the gas hydraulic parameters in the branch high pressure gas network change dynamically with time, it is very important to calculate the hydraulic characteristics of the gas network under the unsteady condition. The dynamic flow is complex and usually needs to be solved by means of computer. This paper is based on this need to develop the branch high-pressure natural gas pipeline dynamic analysis software. In this paper, the non-functional requirements analysis of the simulation subject is first done, and then the core functional requirements analysis is explained based on the core functional requirements analysis. The structure and function modules of the simulation system are introduced in the form of frame diagram. In addition, the man-machine dialogue interface of the system is developed to satisfy the data exchange between the user and the system. In this paper, based on the generating method of node and pipeline association matrix A, the structure diagram of pipe network is automatically expressed in computer language by using the knowledge of graph theory and based on the generation method of node and pipeline association matrix A. Users only need to input the pipe number and the starting node associated with the pipe, and the number of the end node can automatically generate the gas pipe network. Based on the continuity equation, momentum equation and state equation of fluid, the accurate mathematical model of pipe network simulation is established. According to the development requirement of the system, the simplified method of dynamic model is put forward, and the simplified mathematical model of dynamic analysis is obtained. The simplified mathematical model is solved numerically by implicit difference scheme. This method is not strict to the time step, and the stability is good. Using the programming software, the error analysis of the mathematical model is carried out by taking a single high pressure gas pipe as an example. According to the development requirements of the simulation system, the initial conditions and boundary conditions of the system are defined, and the solution method is given. Based on the initial conditions, boundary conditions, the basic equations of gas flow in high pressure pipe network and the parabolic dynamic model of implicit difference scheme, Newton-Raphson method is used to solve the nonlinear equations of nodal flow balance. The flow chart of calculation and solution is given. Then, taking the branch pipe network as an example, the data calculated by the simulation system is compared with the data calculated by the pipeline studio for gas tgnet software developed by ESI Company in the United Kingdom to prove the accuracy and reliability of the system. Finally, the application of the simulation system in pipeline gas storage peak regulation and SCADA system is discussed.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU996
本文编号：2453845
[Abstract]:Because the gas hydraulic parameters in the branch high pressure gas network change dynamically with time, it is very important to calculate the hydraulic characteristics of the gas network under the unsteady condition. The dynamic flow is complex and usually needs to be solved by means of computer. This paper is based on this need to develop the branch high-pressure natural gas pipeline dynamic analysis software. In this paper, the non-functional requirements analysis of the simulation subject is first done, and then the core functional requirements analysis is explained based on the core functional requirements analysis. The structure and function modules of the simulation system are introduced in the form of frame diagram. In addition, the man-machine dialogue interface of the system is developed to satisfy the data exchange between the user and the system. In this paper, based on the generating method of node and pipeline association matrix A, the structure diagram of pipe network is automatically expressed in computer language by using the knowledge of graph theory and based on the generation method of node and pipeline association matrix A. Users only need to input the pipe number and the starting node associated with the pipe, and the number of the end node can automatically generate the gas pipe network. Based on the continuity equation, momentum equation and state equation of fluid, the accurate mathematical model of pipe network simulation is established. According to the development requirement of the system, the simplified method of dynamic model is put forward, and the simplified mathematical model of dynamic analysis is obtained. The simplified mathematical model is solved numerically by implicit difference scheme. This method is not strict to the time step, and the stability is good. Using the programming software, the error analysis of the mathematical model is carried out by taking a single high pressure gas pipe as an example. According to the development requirements of the simulation system, the initial conditions and boundary conditions of the system are defined, and the solution method is given. Based on the initial conditions, boundary conditions, the basic equations of gas flow in high pressure pipe network and the parabolic dynamic model of implicit difference scheme, Newton-Raphson method is used to solve the nonlinear equations of nodal flow balance. The flow chart of calculation and solution is given. Then, taking the branch pipe network as an example, the data calculated by the simulation system is compared with the data calculated by the pipeline studio for gas tgnet software developed by ESI Company in the United Kingdom to prove the accuracy and reliability of the system. Finally, the application of the simulation system in pipeline gas storage peak regulation and SCADA system is discussed.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU996
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