枝狀高壓天然氣管網(wǎng)動態(tài)分析及軟件開發(fā)
發(fā)布時間：2019-04-04 13:06
【摘要】：由于枝狀高壓燃氣管網(wǎng)中的氣體水力參數(shù)是隨著時間動態(tài)變化的，因此對非穩(wěn)態(tài)條件下燃氣管網(wǎng)的水力特征計算尤為重要。動態(tài)流動較復雜，一般需要借助于計算機求解。本文正是基于此需要開發(fā)枝狀高壓天然氣管網(wǎng)動態(tài)分析軟件。 文章先對本仿真課題做了非功能性的需求分析，緊接著立足于核心功能性需求分析進行了說明。以框圖的形式介紹了本仿真系統(tǒng)的結(jié)構(gòu)組成和功能模塊，此外，開發(fā)了本系統(tǒng)的人機對話界面，以滿足用戶和系統(tǒng)之間的數(shù)據(jù)交換。 文章利用圖論知識，基于節(jié)點和管道關(guān)聯(lián)矩陣A的生成方法，自動地實現(xiàn)了將管網(wǎng)的結(jié)構(gòu)圖用計算機語言的表達。用戶使用時只需要輸入管道編號和與管道相關(guān)聯(lián)的起點節(jié)點、終點節(jié)點的編號，即可自動生成燃氣管網(wǎng)。 以流體的連續(xù)性方程、動量方程和狀態(tài)方程為基礎(chǔ)建立準確的管網(wǎng)仿真數(shù)學模型，并根據(jù)本系統(tǒng)的開發(fā)需求，，提出了動態(tài)模型的簡化方法，得到簡化的動態(tài)分析數(shù)學模型。對簡化后的數(shù)學模型，采用隱式差分格式數(shù)值求解。該方法對時間步長要求不嚴格、穩(wěn)定性好。并利用編程軟件，以單根高壓燃氣管為例對該數(shù)學模型進行了誤差分析。 根據(jù)本仿真系統(tǒng)的開發(fā)需求，規(guī)定了系統(tǒng)的初始條件和邊界條件，并給出了求解方法。綜合應(yīng)用初始條件、邊界條件、高壓管網(wǎng)燃氣流動基本方程和隱式差分格式的拋物型動態(tài)模型，采用牛頓-拉夫森法求解節(jié)點流量平衡的非線性方程，并給出計算求解的流程圖。接著以枝狀管網(wǎng)為例，將本仿真系統(tǒng)計算出的數(shù)據(jù)和英國ESI公司開發(fā)的pipeline studio for gas tgnet軟件計算出的數(shù)據(jù)進行對比分析，以證明本系統(tǒng)的精度和可靠性。文章最后論述了本仿真系統(tǒng)在管道儲氣調(diào)峰和SCADA系統(tǒng)中的應(yīng)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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU996
本文編號：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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU996
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