城市非金属管道小孔泄漏数值模拟与试验验证
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摘要
为了研究城市非金属燃气管道发生小孔泄漏的分布规律,通过Gambit建立一个具有多个小泄漏孔的非金属燃气管道三维模型,采用流体动力学软件Fluent模拟PE管道在不同场景下发生小孔泄漏,得到泄漏孔处的压力以及流速分布情况,并结合相应试验进行验证。模拟结果表明:管内压力与泄漏孔处压力与流速成正相关;小孔泄漏范围内,孔径对管道内的整体流量及泄漏速度的影响较小;初始压力越大、孔径越大,管内压力降低的速度越快,但最终都会趋于一个稳定值。试验管道沿程压力和流速的分布、变化情况与模拟结果基本吻合,验证了模拟的有效性,为管道泄漏检测及事故预防提供了理论依据。
In order to examine the distribution of pinhole leakage in urban non-metallic gas pipelines, a three-dimensional model of nonmetal gas pipeline with multiple small leakage holes was established by Gambit. The fluid dynamics software Fluent was used to simulate the leakage of PE pipes in different scenarios. The pressure at the leak holes and the distribution of the flow velocity were obtained and verified with the corresponding experiments. The simulation results show that there is a positive correlation between the pressure in the tube and the pressure at the leak hole and the flow velocity. Within small hole leakage range, the aperture less affects the overall flow within the pipeline and leakage speed?"the higher the initial pressure, the larger the diameter of the tube, the faster the pressure in the tube will decrease, but eventually it will tend to a steady value. The distribution and change of pressure and flow velocity along the experimental pipe basically coincide with the simulation results, which test the validity of the simulation and provide a theoretical basis for pipeline leak detection and accident prevention.
In order to examine the distribution of pinhole leakage in urban non-metallic gas pipelines, a three-dimensional model of nonmetal gas pipeline with multiple small leakage holes was established by Gambit. The fluid dynamics software Fluent was used to simulate the leakage of PE pipes in different scenarios. The pressure at the leak holes and the distribution of the flow velocity were obtained and verified with the corresponding experiments. The simulation results show that there is a positive correlation between the pressure in the tube and the pressure at the leak hole and the flow velocity. Within small hole leakage range, the aperture less affects the overall flow within the pipeline and leakage speed?"the higher the initial pressure, the larger the diameter of the tube, the faster the pressure in the tube will decrease, but eventually it will tend to a steady value. The distribution and change of pressure and flow velocity along the experimental pipe basically coincide with the simulation results, which test the validity of the simulation and provide a theoretical basis for pipeline leak detection and accident prevention.
引文
[1] 张鹏,程淑娟.埋地天然气管道小微孔泄漏规律研究[J]. 中国安全科学学报,2014,24(2):52-58.
[2] 冯文兴,王兆芹,程五一.高压输气管道小孔与大孔泄漏模型的比较分析[J]. 安全与环境工程,2009,16(4):108-110.
[3] Young J D,Bum Jong Ahn.Analysis of hazard areas associated with high-pressure natural-gas pipelines [J]. Journal of Prevention in the Process Industries, 2002,15(3):179-198.
[4] Woodward J L, Mudan K S. Liquid and gas discharge rates through holes in process vessels[J]. Loss Prev Ind,1991,4(4): 161-165.
[5] Young J D,Bum Jong Ahn.A simple model for the release rate of hazardous gas from a hole on high-pressure pilelines [J]. Journal of Hazardous Materials, 2003,97(1.3):31-46.
[6] 石志标,孙宇. 液体管不同宽度微小缝隙泄漏数值模拟研究[J]. 东北电力大学学报,2017,37(1):75-79.
[7] 王大庆,霍春勇,高惠临.长输管线气体泄漏率简化计算方法 [J]. 天然气工业,2008,28(1):116-118.
[8] 付建民,赵振洋,陈国明,等.液相管道流量与压力对小孔泄漏速率的影响[J]. 石油学报,2016,37(2):257-265.
[9] 李晓平,李愚,王茀玺,等.非金属复合材料管道综述[J]. 石油工业技术监督,2017,33(10):1-4.
[10] 王鹤超,吴明,杨蕊,等.建筑群外埋地燃气管道泄漏的风险性评估[J]. 石油与天然气化工,2015,44(1):93-98.
[11] 黄小美,郭杨华,彭世尼,等.室内天然气泄漏扩散数值模拟及试验验证[J]. 中国安全科学学报,2012,22(4):27-31.
[12] 王翠平.长输天然气管道泄漏模拟与风险控制措施研究[D]. 青岛:中国石油大学(华东),2014.
[13] 王丽梅.埋地长输管道泄漏事故应急关键技术研究[D]. 北京:北京工业大学,2012.
[14] 叶迎春,张来斌,王金江.输气管道泄漏声源特性及其变化规律[J]. 天然气工业,2016,36(8):124-131.
[15] 韩策,吴明,赵梁,等.基于FLUENT的架空天然气管道泄漏数值模拟[J]. 辽宁石油化工大学学报,2014,34(6):30-34.
[16] 郝永梅,徐明.城市燃气管道泄漏数值模拟和试验分析 [J]. 常州大学学报,2017,29(1):79-85.
[2] 冯文兴,王兆芹,程五一.高压输气管道小孔与大孔泄漏模型的比较分析[J]. 安全与环境工程,2009,16(4):108-110.
[3] Young J D,Bum Jong Ahn.Analysis of hazard areas associated with high-pressure natural-gas pipelines [J]. Journal of Prevention in the Process Industries, 2002,15(3):179-198.
[4] Woodward J L, Mudan K S. Liquid and gas discharge rates through holes in process vessels[J]. Loss Prev Ind,1991,4(4): 161-165.
[5] Young J D,Bum Jong Ahn.A simple model for the release rate of hazardous gas from a hole on high-pressure pilelines [J]. Journal of Hazardous Materials, 2003,97(1.3):31-46.
[6] 石志标,孙宇. 液体管不同宽度微小缝隙泄漏数值模拟研究[J]. 东北电力大学学报,2017,37(1):75-79.
[7] 王大庆,霍春勇,高惠临.长输管线气体泄漏率简化计算方法 [J]. 天然气工业,2008,28(1):116-118.
[8] 付建民,赵振洋,陈国明,等.液相管道流量与压力对小孔泄漏速率的影响[J]. 石油学报,2016,37(2):257-265.
[9] 李晓平,李愚,王茀玺,等.非金属复合材料管道综述[J]. 石油工业技术监督,2017,33(10):1-4.
[10] 王鹤超,吴明,杨蕊,等.建筑群外埋地燃气管道泄漏的风险性评估[J]. 石油与天然气化工,2015,44(1):93-98.
[11] 黄小美,郭杨华,彭世尼,等.室内天然气泄漏扩散数值模拟及试验验证[J]. 中国安全科学学报,2012,22(4):27-31.
[12] 王翠平.长输天然气管道泄漏模拟与风险控制措施研究[D]. 青岛:中国石油大学(华东),2014.
[13] 王丽梅.埋地长输管道泄漏事故应急关键技术研究[D]. 北京:北京工业大学,2012.
[14] 叶迎春,张来斌,王金江.输气管道泄漏声源特性及其变化规律[J]. 天然气工业,2016,36(8):124-131.
[15] 韩策,吴明,赵梁,等.基于FLUENT的架空天然气管道泄漏数值模拟[J]. 辽宁石油化工大学学报,2014,34(6):30-34.
[16] 郝永梅,徐明.城市燃气管道泄漏数值模拟和试验分析 [J]. 常州大学学报,2017,29(1):79-85.