格拉管线浅层冻土温度变化对0号柴油输送温降的影响

Influences of Shallow Permafrost's Temperature Field Along Golmud-Lhasa Pipeline on Temperature Drops of 0# Diesel's Transportation

以水热耦合模型为基础,依据风火山地区的气象资料,用ANSYS软件模拟一年中大气温度变化对浅层冻土的影响,确定格拉管线运行的自然地温环境。结果表明模拟值与实测数据基本吻合,且温度月变化随深度增加而渐趋平缓。继而以7月中旬的自然地温为边界条件,运用Fluent软件模拟0号柴油输送过程中的温降变化。结果表明:温度为11℃的0号汽油流经48 m长的管路,最大温降约为5.5℃,且沿程温降模拟值与轴向温降计算式的计算结果基本相符;以0℃为边界温度,模拟了入口温度为0℃柴油的黏性增温效应,结果显示,流经48 m长的管路,油流的黏性温升约为0.000 8℃。

Based on thehydro-thermal coupling model of frozen earth temperature and the meteorological data of the Feng-huoshan area, the temperature changes caused by the atmosphere are simulated using ANSYS. Thus the temperatures of the operat-ing environment are given. Results show that, the simulations coincide with the measured values approximately, and the temperaturechanges more gently through a year as it becomes deeper. Then the drops of the temperature during 0# diesel transportation in mid-dle July is simulated with Fluent, and the results show that the temperature of the 0# gasoline drops from 11 ℃ to 5.5 ℃ during itstransportation in 48 m pipeline. And the values accord well with which calculated through the formula. The temperature rises causedby viscous heating of 0# diesel is also simulated with a boundary of 0 ℃. The results show that the temperature rises 0.000 8 ℃ dur-ing its transportation in a 48 m pipeline.