油气在持续热壁下热着火发生的数值模拟

吴松林; 杜扬; 欧益宏; 张培理; 梁建军

doi:10.11883/bzycj-2016-0262

油气在持续热壁下热着火发生的数值模拟

doi: 10.11883/bzycj-2016-0262

1.
陆军勤务学院基础部, 重庆 401311
2.
陆军勤务学院供油工程系, 重庆 401311

基金项目:

重庆市基础与前沿研究项目 cstc2013jcyjA00006

详细信息

作者简介:
吴松林(1973-), 男, 博士, 教授, wusonglin100@163.com

中图分类号: O381
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- PDF下载量: 126
- 被引次数: 0
出版历程
- 收稿日期: 2016-08-25
- 修回日期: 2017-04-07
- 刊出日期: 2018-05-25

Numerical simulation of gasoline-air thermal ignition induced by continuous hot wall

1.
Department of Fundamental Studies, Army Logistical University, Chongqing 401311, China
2.
Department of Petroleum Supply Engineering, Army Logistical University, Chongqing 401311, China

摘要

摘要: 为了对油气在持续热壁下热着火发生过程进行数值模拟，耦合化学动力学模型、流体动力学模型及辐射传热模型，建立了油气热着火的统一模型。基于实验工况，模拟了受限空间中油气在持续热壁条件下热着火发生过程，并分析了温度、压力流场的演变特征，以及不同位置处温度、压力、层流速度、湍流速度和组分质量分数的变化曲线。通过模拟，发现油气热着火过程存在3个阶段，分别为加热初始阶段、加热中间阶段和热着火发生阶段。不同阶段存在的主要原因是化学反应和流动的主导作用不同。
- 油气 /
- 统一模型 /
- 热着火 /
- 持续热壁 /
- 化学动力学 /
- 流体动力学 /
- 辐射传热
Abstract: In order to simulate the thermal ignition process of gasoline-air in continuous hot wall, the chemical kinetic model, hydrodynamic model and radiation heat transfer model were coupled to establish a unified model of gasoline-airthermal ignition. According to the working condition of the experiment, the occurrence process of gasoline-air thermal ignition was simulated under the conditions of high temperature induced by continuous hot wall in confined space. Flow field evolution characteristics of the temperature and the pressure were analyzed. The variation curves of temperature, pressure, flow velocity, turbulent velocity and group concentration were obtained at different positions. By simulation, it is found that there are three stages in the process of gasoline-air thermal ignition, namely, the initial heating stage, the heating intermediate stage and the thermal ignition stage. The main reason for the existence of different stages is that the leading roles of chemical reaction and flow are different.
- gasoline-air /
- unified model /
- thermal ignition /
- continuous hot wall /
- chemical kinetic /
- hydrodynamic /
- radiation heat transfer

HTML全文

图 1 方程组的分离式解法示意图

Figure 1. Schematic diagram for segregated solving equations

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图 2 实验台架内选点的位置

Figure 2. Selected positions in experimental bench

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图 3 热着火发生时热壁表面的临界温度

Figure 3. Critical temperature of the hot wall surface when thermal ignition occurs

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图 4 油气热着火温度场模拟图

Figure 4. Simulated temperature-field diagrams of gasoline-air thermal ignition

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图 5 7个空间点的温度变化曲线

Figure 5. Temperature curves of 7 spatial points

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图 6 热着火压力等值线

Figure 6. Pressure contours of thermal ignition

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图 7 7个点的压力变化曲线

Figure 7. Pressure variation curves at 7 spatial points

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图 8 1号位置反应物的质量分数变化曲线

Figure 8. Mass faction curve at the first spatial point

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图 9 不同位置C₄H₁₀的质量分数变化曲线

Figure 9. Mass faction curves of C₄H₁₀ at different positions

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图 10 不同位置OH的质量分数变化曲线

Figure 10. Mass faction curves of OH at different positions

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图 11 不同位置CO的质量分数变化曲线

Figure 11. Mass faction curves of CO at different positions

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图 12 不同位置H₂O的质量分数变化曲线

Figure 12. Mass faction curves of H₂O at different positions

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图 13 不同位置O₂的质量分数变化曲线

Figure 13. Mass faction curves of O₂ at different positions

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图 14 初始阶段横轴方向火焰速度变化曲线

Figure 14. Velocity of the flame in x direction at initial stage

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图 15 发生阶段横轴方向火焰速度变化曲线

Figure 15. Velocity of the flame in x direction at occurrence stage

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图 16 初始阶段纵轴方向火焰速度变化曲线

Figure 16. Velocity of the flame in y direction at initial stage

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图 17 发生阶段纵轴方向火焰速度变化曲线

Figure 17. Velocity of the flame in y direction at occurrence stage

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图 18 发生阶段火焰湍流速度曲线

Figure 18. Turbulent velocity of the flame at occurrence stage

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表 1 初始组分

Table 1. Initial components

初始组分	质量分数	摩尔分数	摩尔浓度/(mol·cm^-3)
CH₄	0.01	0.018 2	7.45×10^-7
C₂H₆	0.01	0.009 7	3.98×10^-7
C₃H₈	0.01	0.006 6	2.71×10^-7
C₄H₁₀	0.01	0.005 0	2.05×10^-7
n-C₇H₁₆	0.01	0.002 9	1.19×10^-7
i-C₈H₁₈	0.01	0.002 6	1.04×10^-7
O₂	0.21	0.192 1	7.85×10^-6
N₂	0.73	0.763 0	3.12×10^-5

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表 2 热着火过程的6个时间点的基本参数

Table 2. Basic parameters of the thermal ignition process at 6 time points

时间点	t/ms	n	T_max/K	p_max/Pa	v_{x, max}/(m·s^-1)	v_{y, max}/(m·s^-1)	I/%
No.1	100.09	10 000	452.12	10 484.3	4.93	4.76	280.551
No.2	413.06	63 000	581.78	92 218.8	66.89	52.59	2 435.931
No.3	413.53	64 800	844.91	127 912.0	109.51	55.40	2 812.672
No.4	413.53	80 000	872.86	144 851.9	100.20	42.66	2 266.638
No.5	413.53	100 000	914.99	179 834.6	99.01	40.38	2 195.186
No.6	414.06	587 200	1271.99	381 857.6	306.55	142.44	14 418.030

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