点火条件对密闭管道内预混氢气/空气燃爆特性的影响

孙从煌; 曲艳东; 刘万里; 翟诚

doi:10.11883/bzycj-2016-0309

点火条件对密闭管道内预混氢气/空气燃爆特性的影响

doi: 10.11883/bzycj-2016-0309

辽宁工业大学土木建筑工程学院, 辽宁锦州 121001

基金项目:

国家自然科学基金项目 11302094

辽宁省高等学校优秀人才项目 LJQ2014063

辽宁省科技厅预研项目 SY201603

辽宁工业大学教师科研启动基金项目 X201403

详细信息

作者简介:
孙从煌(1990-), 男, 硕士研究生

通讯作者:
曲艳东, quyandong@lnut.edu.cn

中图分类号: O381;TD712
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- 被引次数: 0
出版历程
- 收稿日期: 2016-10-20
- 修回日期: 2017-01-16
- 刊出日期: 2018-05-25

Influence of different ignition conditions on deflagration characteristics of a premixed mixture of H₂ and air in a closed pipe

College of Civil Engineering and Architecture, Liaoning University of Technology, Jinzhou 121001, Liaoning, China

摘要

摘要: 基于流体动力学软件Fluent，开展数值模拟，研究点火位置（距管左端壁面100、200和500 mm）、点火温度（1 000、1 500和2 000 K）和点火面积（管左端壁面处半径为50、35和20 mm的点火域）等点火条件对1 000 mm密闭管道中预混氢气/空气（H₂/air）燃爆特性的影响。研究表明：点火位置距管左端壁面越远，中间节点处温度越高，温升越快；不同点火温度下管内最高温升速率基本同步，且提高点火温度，使得燃烧反应更剧烈，能提高管内气体温升速率，但却降低管内的压力峰值；点火面积越小，预混H₂/air燃烧前期温升越快。当采用半径为35 mm的点火域和点火位置距管左端壁面100 mm的点火方式时，预混H₂/air燃爆的各项参数相对较高。不同点火条件对密闭管内气体的动能和内能的影响规律类似于其对管内气体的流速和温度的影响规律，而对涡量的影响不明显。
- 点火条件 /
- 密闭管道 /
- 预混火焰 /
- 湍流燃烧 /
- 火焰前锋
Abstract: Numerical simulation was carried out by applying the fluid dynamics software Fluent to explore the influences of different ignition conditions, such as ignition locations (the distances from the left wall of the closed pipe are 100, 200, and 500 mm, respectively), ignition temperatures (1 000, 1 500 and 2 000 K) and ignition area (ignition radius:50, 35 and 20 mm) on the deflagration characteristics of the premixed H₂/air mixture in a closed pipe with 1 000 mm in length. The results show that, when the ignition positions are far away from the left wall of the closed pipe, the temperature of the intermediate node in the flow field is higher and the temperature rising is faster in the closed pipe. The rising rates of the maximum temperatures are basically synchronous on the conditions of the three different ignition temperatures (1 000, 1 500 and 2 000 K). Meanwhile, the combustion reaction of H₂/air is more intense with the increasing of the ignition temperatures. The temperature rising rate in the closed pipe is accelerated. However, the peak pressure in the closed pipe is reduced. Moreover, the smaller the ignition area, the faster the temperature rising of H₂/air in the early stage. When the radius of the ignition area is 35 mm and the ignition position away from the left side wall of the closed pipe is 100 mm, the deflagration parameters of H₂/air are relatively higher. The influence of different ignition conditions on the kinetic energy and internal energy is similar to the influence of different ignition conditions on the velocity and temperature of the premixed gas, but the ignition conditions hardly influence the vorticity.
- ignition condition /
- closed pipe /
- premixed flame /
- turbulent combustion /
- frame front

HTML全文

图 1 密闭管道的几何模型

Figure 1. Geometric model of the closed pipe

下载: 全尺寸图片幻灯片

图 2 不同时刻预混H₂/air的燃爆过程及其火焰阵面结构图

Figure 2. Deflagration process and flame front structures of H₂/air pre-mixed gases at different times

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图 3 管内不同位置观测点的温度时程曲线

Figure 3. Temperature-time curves of different observation points in the closed pipe

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图 4 不同点火条件下管内最高温度的时程曲线

Figure 4. Maximum temperature-time curves of the closed pipe under different ignition conditions

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图 5 不同点火条件下管内最大压力时程曲线

Figure 5. Peak pressure-time curves of the closed pipe under different ignition conditions

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图 6 不同点火条件下中间测点的温度时程曲线

Figure 6. Temperature-time curves of the middle observation point under different ignition conditions

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图 7 不同点火条件下中间测点的压力时程曲线

Figure 7. Pressure-time curves of the middle observation point under different conditions

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图 8 不同点火条件下火焰前锋位置和速度时程曲线

Figure 8. Location- and velocity-time curves of flame front under different ignition conditions

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图 9 不同点火条件下中间测点处气流速度曲线

Figure 9. Airflow velocity-time curves of the middle observation point under different ignition conditions

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图 10 不同点火条件下动能时程曲线

Figure 10. Kinetic energy-time curves under different ignition conditions

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图 11 不同点火条件下内能变化时程曲线

Figure 11. Internal energy-time curves under different ignition conditions

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图 12 管内涡量运动及最大涡量的变化情况

Figure 12. Movement of vorticity and change of maximum vorticity

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图 13 不同点火条件下管内中间节点处涡量时程曲线

Figure 13. Vorticity-time curves of the middle node in the closed pipe under different ignition conditions

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表 1 密闭管道内各燃料组分和初始条件^[15]

Table 1. Fuel components and initial conditions in the closed pipe^[15]

Fluid area	Mass fraction of gas component				Initial temperature/K	Initial pressure/kPa
Fluid area	H₂	O₂	N₂	H₂O	Initial temperature/K	Initial pressure/kPa
Fuel area	0.022 62	0.217 2	0.76	0	300	101.325
Ignition area	0	0.046	0.76	0.213	1 500	101.325

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