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《Natural Gas Industry》 2014-11
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Impact of a hole′s geometrical characteristics on the aperture leakage of natural gas pipelines

Fu Jianmin;Zhao Hongxiang;Chen Guoming;Zheng Xiaoyun;Zhu Yuan;Ren Ting;Sinopec Engineering Incorporation;Mechanical and Electronic Engineering Institute,China University of Petroleum;Henan Branch of Sinopec Geophysical Corporation;  
Gas leakage rate calculation is the premise of and foundation for leakage risk assessment in natural gas pipelines.An experimental system was established for the small leakage of natural gas pipelines to evaluate the respective leakage rates respectively of round holes,circumferential rectangular square holes and axial rectangular square holes,and to obtain the gas leaking rate of holes with different geometrical characteristics.On this basis,FLUENT-based pipe hole-leak CFD simulation was performed to investigate the influence mechanism of hole geometrical characteristics on medium-and low-pressure pipe hole-leaking rate and gas dynamic characteristic quantities,including speed distribution and Mach number distribution.Simulation results showed that the maximum rate was at the cross-section center of a leaking hole,and that the maximum speed of a rectangular hole was significantly higher than that of a square hole,but the influence of hole direction was insignificant;and in terms of critical pressure ratio,if the hole area was determined,it is easier for a rectangular square hole to achieve the critical flow;but as for the critical pressure of a round hole,a circumferential rectangular square hole,and an axial rectangular square hole,their analogous values were all lower than theoretical values.The experimental results are of great help to the deepening of gas pipe hole-leaking research and provide scientific guidance for the emergency response to gas pipe leakage.
【Fund】: 中央高校基本科研业务费专项资金项目(编号:14CX02075A);; 青岛市民生科技计划重点支持项目(编号:14-2-3-64-nsh)
【CateGory Index】: TE973
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