摘要
为得到埋地管道气密性试验过程管道内介质和管外壁温度的关系式,降低管内温度测量不准确对气密性试验结果的影响,建立了埋地管道气密性试验过程温度场的物理模型和数学模型,全面考虑了埋地管道对土壤温度场的水平影响范围,分析了土壤恒温层深度及温度、土壤自然温度场及大气温度突变等对埋地管道温度场的影响,模拟得到了埋地管道气密性试验过程的温度场分布,拟合得到了管内外温度的关系式。根据《城镇燃气输配工程施工及验收规范》对埋地管道进行了气密性试验,对试验得到的温度数据进行了处理,拟合得到了管内外温度的关系式。将试验与模拟得到的管内外温度关系式和实际测得的管内外温度进行了全面比较。研究结果表明,数值模拟的结果准确合理,且试验得到的计算公式具有较高的可靠性与准确性,有利于提高管道气密性试验的准确度。
Aiming at getting the formula of the temperature inside and outside the buried PE pipe during the air-tight test, a 1/2 physical and mathematical model was proposed, and the finite element software was applied to simulate the temperature distribution during the test consid- ering the horizontal and vertical direction boundary conditions, the natural temperature field of the earth and the influence of the atmosphere temperature abrupt changing. Another computational formula was fitted based on the temperature data achieved by the air-tight test. Accord- ing to the comparison with the temperature data getting from the air-tight test, the results indicate that the simulation is accurate and rational, and the formula fitted based on the air-tight test is proved to be reliable and accurate.
出处
《机电工程》
CAS
2013年第11期1329-1334,共6页
Journal of Mechanical & Electrical Engineering
关键词
埋地管道
气密性试验
温度场
理论模型
buried pipeline
air-tight test
temperature field
theoretical model
