燃氣泄漏擴散數(shù)值模擬分析及軟件開發(fā)
發(fā)布時間：2018-08-05 09:19
【摘要】：隨著21世紀的第二個十年的到來，城市發(fā)展也越來越快，作為配套基礎設施的燃氣行業(yè)得到了空前的大發(fā)展。但因為燃氣管道鋪設的方式、燃氣管道材質的問題、供氣范圍的擴大等多方面因素的影響，燃氣泄漏事件是很容易產(chǎn)生的。因此無論從對人員的保護還是經(jīng)濟財產(chǎn)的保護的角度，研究燃氣的泄漏擴散規(guī)律都是相當必要的，這對減小事故引起的各方面損失有重要的意義。 本文梳理了現(xiàn)有的燃氣擴散理論，比較分析了風向風速、空氣溫度、大氣因素、燃氣物理性質及地面條件等等對燃氣泄漏擴散過程的影響。同時為了簡化Fluent軟件的模擬操作，本文中運用了Fluent的程序日志文件，在.NET操作平臺上編寫了一個針對Fluent的輔助程序，通過該程序實現(xiàn)了對Fluent軟件的數(shù)值模擬過程的控制，成功在軟件界面整合了各項如擴散模型、物理性質等重要參數(shù)設置，簡單直觀的設置之后在后臺調(diào)用Fluent進行數(shù)值計算，并且能在計算收斂后，生成所需要的云圖和矢量圖進行觀察分析。這就能很好的節(jié)約使用人員的設置時間和學習成本，并且對燃氣泄漏擴散的模擬具有一定的通用性。 最后，通過該自制程序對住宅小區(qū)內(nèi)的燃氣管道泄漏導致的燃氣泄漏擴散的各種擴散狀態(tài)進行數(shù)值模擬，得到了燃氣在不同物理性質下、不同室外風速條件下、不同室外風向下以及不同時間段的濃度、速度、壓力分布圖，并詳細分析了之前各種不同條件下，即風向風速、空氣溫度、大氣因素、燃氣物理性質及地面條件等等影響下的燃氣泄漏擴散規(guī)律。得出如下結論：（1）輕質氣體不僅受室外風的作用，也受室外空氣浮力的作用，會有很明顯的向上擴散趨勢，而重氣受空氣浮力影響較小，會向下并且順風擴散；（2）室外風是有利于泄漏氣體的泄漏擴散的，外界風速越大，泄漏源及其附近地帶形成的濃度分布越��；（3）障礙物的存在是降低燃氣擴散速度的重要因素之一；（4）風向的變化也會改變泄漏燃氣原有的流動規(guī)律；（5）模擬區(qū)域內(nèi)的燃氣濃度與泄漏時間幾乎是成線性關系的，在一定的時間段內(nèi)，泄漏時間越長，燃氣的濃度也就越大；（6）在模擬區(qū)域內(nèi)的燃氣泄漏過程，，首先是一個非穩(wěn)態(tài)的泄漏過程，然后隨著泄漏時間的慢慢變長逐漸變成一個穩(wěn)定不變的狀態(tài)。
[Abstract]:With the arrival of the second ten years in twenty-first Century, the urban development is getting faster and faster. The gas industry, as a supporting infrastructure, has been developing unprecedentedly. But because of the gas pipeline laying, the problem of gas pipeline material and the expansion of the gas supply range, gas leakage is very easy to produce. It is necessary to study the law of gas leakage and diffusion, not only from the protection of personnel or the protection of economic property, which is of great significance to reduce the loss of all aspects caused by the accident.
In this paper, the existing theory of gas diffusion is combed, and the influence of wind direction wind speed, air temperature, atmospheric factors, physical properties of gas and ground conditions on the process of gas leakage and diffusion is compared. In order to simplify the simulation operation of Fluent software, the Fluent program log file is used in this paper, and one of the.NET operating platform is written. An auxiliary program for Fluent is used to control the numerical simulation process of Fluent software. It has successfully integrated various important parameters such as diffusion model and physical property in the software interface. After simple and intuitive setting, it can be called Fluent for numerical calculation in the background, and it can be generated after the calculation is convergent. It is very good to save the time and the learning cost of the personnel, and it has a certain generality for the simulation of gas leakage diffusion.
Finally, through the self-made program, the diffusion of gas leakage caused by gas pipeline leakage in the residential district is simulated. The concentration, velocity and pressure distribution of gas in different outdoor wind direction and different outdoor wind direction under different physical properties and different outdoor wind speed conditions are obtained, and the detailed analysis is made. The law of gas leakage and diffusion under the influence of wind direction wind speed, air temperature, atmospheric factors, physical properties of gas and ground conditions and so on. The following conclusions are drawn: (1) light gas is not only affected by outdoor air, but also affected by outdoor air buoyancy, it will have a very obvious upward diffusion trend, and the heavy gas is floated by air. The influence of the force is smaller and will spread down the wind; (2) the outdoor wind is beneficial to the leakage of the leakage gas. The greater the wind speed, the smaller the concentration distribution of the leakage source and its vicinity; (3) the existence of the obstacles is one of the important factors to reduce the gas diffusion speed; (4) the change of wind direction will also change the original gas leakage. (5) the gas concentration in the simulated region is almost linear with the leakage time. In a certain period of time, the longer the leakage time, the greater the gas concentration. (6) the process of gas leakage in the simulated region is first an unsteady state leakage process, and then gradually changes with the length of the leakage time. Become a steady state.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU996
本文編號：2165343
[Abstract]:With the arrival of the second ten years in twenty-first Century, the urban development is getting faster and faster. The gas industry, as a supporting infrastructure, has been developing unprecedentedly. But because of the gas pipeline laying, the problem of gas pipeline material and the expansion of the gas supply range, gas leakage is very easy to produce. It is necessary to study the law of gas leakage and diffusion, not only from the protection of personnel or the protection of economic property, which is of great significance to reduce the loss of all aspects caused by the accident.
In this paper, the existing theory of gas diffusion is combed, and the influence of wind direction wind speed, air temperature, atmospheric factors, physical properties of gas and ground conditions on the process of gas leakage and diffusion is compared. In order to simplify the simulation operation of Fluent software, the Fluent program log file is used in this paper, and one of the.NET operating platform is written. An auxiliary program for Fluent is used to control the numerical simulation process of Fluent software. It has successfully integrated various important parameters such as diffusion model and physical property in the software interface. After simple and intuitive setting, it can be called Fluent for numerical calculation in the background, and it can be generated after the calculation is convergent. It is very good to save the time and the learning cost of the personnel, and it has a certain generality for the simulation of gas leakage diffusion.
Finally, through the self-made program, the diffusion of gas leakage caused by gas pipeline leakage in the residential district is simulated. The concentration, velocity and pressure distribution of gas in different outdoor wind direction and different outdoor wind direction under different physical properties and different outdoor wind speed conditions are obtained, and the detailed analysis is made. The law of gas leakage and diffusion under the influence of wind direction wind speed, air temperature, atmospheric factors, physical properties of gas and ground conditions and so on. The following conclusions are drawn: (1) light gas is not only affected by outdoor air, but also affected by outdoor air buoyancy, it will have a very obvious upward diffusion trend, and the heavy gas is floated by air. The influence of the force is smaller and will spread down the wind; (2) the outdoor wind is beneficial to the leakage of the leakage gas. The greater the wind speed, the smaller the concentration distribution of the leakage source and its vicinity; (3) the existence of the obstacles is one of the important factors to reduce the gas diffusion speed; (4) the change of wind direction will also change the original gas leakage. (5) the gas concentration in the simulated region is almost linear with the leakage time. In a certain period of time, the longer the leakage time, the greater the gas concentration. (6) the process of gas leakage in the simulated region is first an unsteady state leakage process, and then gradually changes with the length of the leakage time. Become a steady state.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU996
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