桥梁热力管防冻融冰系统的数值模拟

Numerical Simulation of Heating Pipes deicing System on Bridge

中文关键词: 热力管  桥梁路面  防冻融冰  数值模拟

英文关键词: heat pipe  bridge pavement  anti-frost and ice melting  numerical simulation

中文摘要:

      热力管加热桥面融雪化冰对于保障交通安全具有重要意义。针对赤石大桥的地理环境和气象条件,建立了其热力融冰过程的数值模型,研究了热力管间距为100mm、150mm和200mm三种情况下融冰系统的热量传递过程和桥面温度变化规律。结果表明：在相同工况条件下,主桥向底面传递的热损失基本可以忽略,而引桥的热损失较大；在热力管层添加一定厚度的隔热材料,引桥向下传递的热量损失减少5%左右；从向桥面传递的热量来看,100mm间距融冰系统的融冰能力要远大于200mm间距融冰系统；在340W/m₂的融冰负荷情况下,当热力管外表面工作温度为25℃时,100mm间距敷设的热力管融冰系统,能使桥面平均温度在2.5℃以上,并且桥面温度场较为均匀,能有效融冰。

英文摘要:

      Using heat pipe to melt snow and ice is of great significance to ensuring traffic safety. According to the geographical environment and meteorological conditions of Chishi Bridge, the numerical model of thermodynamic process of melting ice was established. The heat pipe melting ice system"s heat transfer process and temperature changes of the pavement were studied when the distance of the pipes was 100mm, 150mm, 200mm respectively. The results show that under the same condition, the main bridge"s heat loss could be ignored while the approach"s heat loss is much. After adding a certain thickness of insulating layer, the downside transmit of the approach’s heat loss is decreased by 5% compared with before. As of the heat transform to the pavement, the capacity of 100mm spacing"s melting ice system is greater than that of 200mm spacing"s. The results also show that when the external surface temperature of heat pipe is about 25℃ with the 100mm spacing,and the power of external melting ice is 340W/m₂,the bridge’s surface temperature is above 2.5℃ and the pavement"s temperature field is relatively uniform,which can meet ice melting standards effectively.