【摘要】：目前,氣體能源管道事故頻發(fā)且后果嚴(yán)重。為了輔助安全從業(yè)人員針對不同環(huán)境溫度條件,制定相應(yīng)的預(yù)防及控制管道火災(zāi)事故的措施,本文利用CFD軟件,研究不同條件下,初始溫度對管道內(nèi)預(yù)混火焰?zhèn)鞑ヌ匦杂绊懙囊?guī)律。本文利用ANSYS Fluent建立了長方體管道幾何模型,將數(shù)值模擬所得數(shù)據(jù)與前人實(shí)驗(yàn)所得數(shù)據(jù)進(jìn)行對比。在驗(yàn)證模型的準(zhǔn)確度的基礎(chǔ)上,利用該模型研究了甲烷-空氣預(yù)混氣體和丙烷-空氣預(yù)混氣體在240K~320K的溫度范圍內(nèi),初始溫度對于預(yù)混氣體火焰?zhèn)鞑ヌ匦缘挠绊?然后以甲烷-空氣預(yù)混氣體為例,研究在不同體積分?jǐn)?shù)和不同初始壓力下,在240K~320K的溫度范圍內(nèi),初始溫度對于預(yù)混氣體火焰?zhèn)鞑ヌ匦缘挠绊憽Ｑ芯堪l(fā)現(xiàn),初始溫度對于不同預(yù)混氣體的火焰?zhèn)鞑ヌ匦缘挠绊懙囊?guī)律大體相同,火焰速度和火焰溫度都是隨著初始溫度的升高而升高,管道內(nèi)最大壓力隨著初始溫度的升高而降低,但是在相同時(shí)間點(diǎn)的管道內(nèi)的壓力隨初始溫度的升高而升高,這說明在尖端火焰階段及Tulip火焰階段,管道內(nèi)壓力的上升速度均隨初始溫度的升高而升高。模擬結(jié)果發(fā)現(xiàn),在不同的體積分?jǐn)?shù)下,管道內(nèi)預(yù)混氣體火焰?zhèn)鞑ミ^程中,尖端火焰階段及Tulip火焰階段的火焰速度,均隨著初始溫度的增加而增加。隨著體積分?jǐn)?shù)的增大,初始溫度對于火焰溫度及管道內(nèi)壓力上升速度的影響越來越小。在不同的初始壓力條件下,火焰?zhèn)鞑サ乃俣仁请S著初始溫度的升高而升高的,但是當(dāng)初始壓力升高到0.5MPa以上時(shí),預(yù)混火焰溫度的最高值及Tulip火焰階段火焰溫度的平均值都不隨初始溫度的變化而變化。在不同初始壓力的條件下,管道內(nèi)壓力的最大值,隨著初始溫度的升高而降低�？梢钥闯黾舛嘶鹧骐A段的管道內(nèi)壓力的上升速度隨著初始溫度的升高而升高,但是在不同壓力條件下,Tulip火焰階段管道內(nèi)壓力的上升速度變化規(guī)律是不同的,初始壓力在0.1MPa~0.5MPa的范圍時(shí),Tulip火焰階段管道內(nèi)壓力的上升速度隨初始溫度的增加而增加,初始壓力在0.5MPa~1MPa的范圍時(shí),Tulip火焰階段管道內(nèi)壓力的上升速度隨初始溫度的增加而降低。
[Abstract]:At present, gas energy pipeline accidents occur frequently and the consequences are serious. In order to assist safety workers to work out the corresponding measures to prevent and control pipeline fire accidents according to different environmental temperature conditions, this paper makes use of CFD software to study the different conditions. The effect of initial temperature on the propagation characteristics of premixed flame in pipeline. In this paper, the geometric model of cuboid pipe is established by ANSYS Fluent, and the data obtained by numerical simulation are compared with those obtained by previous experiments. Based on the accuracy of the model, the effects of the initial temperature on the flame propagation characteristics of the premixed gas in the temperature range of 240K~320K were studied by using the model, in which the methane air premixed gas and propane air premixed gas were premixed at the temperature range of 240K~320K. Then taking methane air premixed gas as an example, the effect of initial temperature on flame propagation characteristics of premixed gas is studied under different volume fraction and different initial pressure in the temperature range of 240K~320K. It is found that the effect of the initial temperature on the flame propagation characteristics of different premixed gases is approximately the same, and the flame velocity and flame temperature increase with the increase of the initial temperature. The maximum pressure in the pipeline decreases with the increase of the initial temperature, but the pressure in the pipeline at the same time point increases with the increase of the initial temperature, which indicates that in the tip flame stage and the Tulip flame stage, The increasing velocity of the pressure in the pipeline increases with the increase of the initial temperature. The simulation results show that the flame velocities of the tip flame stage and the Tulip flame stage increase with the increase of the initial temperature during the flame propagation of premixed gas in the pipeline under different volume fraction. With the increase of volume fraction, the effect of initial temperature on flame temperature and pressure rise rate is smaller and smaller. Under different initial pressure conditions, the velocity of flame propagation increases with the increase of initial temperature, but when the initial pressure rises above 0.5MPa, The maximum temperature of the premixed flame and the average of the flame temperature in the Tulip flame stage do not change with the change of the initial temperature. Under different initial pressures, the maximum pressure decreases with the increase of initial temperature. It can be seen that the rising rate of pressure in the pipeline in the tip flame stage increases with the increase of the initial temperature, but the variation law of the pressure rising velocity in the tulip flame stage is different under different pressure conditions. When the initial pressure is in the range of 0.1MPa~0.5MPa, the increase rate of the pressure in the tube increases with the increase of the initial temperature, and the increase rate of the pressure in the initial pressure is decreased with the increase of the initial temperature when the initial pressure is in the range of 0.5MPa~1MPa.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE88

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