摘要
受飓风、暴雨、泥石流等恶劣天气的影响,埋地管道可能局部处于半掩埋状态。目前半埋管道传热计算多采用"线性插值"模型。建立了半埋热油管道的流(空气水)—管—土耦合传热机理模型,并利用数值模拟手段对不同条件下管道的传热特性进行了研究。结果表明,管道的总传热系数、出口温度和土壤蓄热量与管道的相对埋入面积呈明显的非线性关系;线性模型与机理模型的计算结果在趋势与数值方面均具有较大偏差;管道刚好完全掩埋时与完全不掩埋时相比,总传热系数出口温度的差异较大,且管径越大,差异越显著;当环境流体的温度较低时,管道出口温度对相对埋入面积更敏感。
As a result of bad weather, such as hurricane, storm or landslide, some part of buried pipeline may be in a semi- buried state. Currently the ＂linear interpolation＂ model is used to calculate the heat loss of partially buried pipe. A mechanism model of heat transfer of fluid （air/water）-pipe-soil coupling is developed, and the thermal behaviors of pipeline are studied by numerical simulation. The results show that the changes of the overall heat transfer coefficient, outlet temperature and soil heat storage of pipeline with the fraction of outside surface of pipe in touch with soil have obvious non-linear characters, both the trend and value of the linear model deviate from that of the mechanism model greatly. There are significant differences in the overall heat transfer coefficients/outlet temperatures between the pipe completely exposed to the surrounding fluid and that just covered by soil. The bigger the pipe diameter is, the greater the differences are. When the temperature of the surrounding fluid is lower, the outlet temperature is more sensitive to the fraction of outside surface of pipe covered by soil.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期173-179,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项课题(2008ZX05026-004)
关键词
热油管道
半埋
传热模型
数值模拟
热力特性
hot oil pipeline
partially buried
heat transfer model
numerical simulation
thermal behavior
