管道内冰浆流动压降特性模拟和实验研究

Numerical Simulation and Experimental Study on Flow Pressure Drop of Ice Slurry in Piping Systems

本文采用以颗粒相动力学为基础的Euler-Euler模型,利用FLUENT研究冰浆在水平直管、90°弯管和T型管中的流动压降特性(计算过程不考虑相变)。模拟结果显示,在管道入口处压降较明显,90°弯管拐弯后内侧压力小于外侧,T型管在分流直角拐角处出现压力最高点和最低点。冰浆流动实验发现,冰浆单位压降随流速和含冰率的增加而增大,且3种管型中直管压降最小,T型管压降最大。对比实验与模拟结果,单位压降随流速的变化趋势一致,且误差在20%以内,但在大流速时,模拟值大于实验值。

Based on particle phase dynamics,the Euler-Euler model in FLUENT was selected to numerically simulate the ice slurry flowing in a piping system such as a straight pipe,90°elbow pipe,and T type pipe without considering the ice melting process.The simulation results revealed that the pressure drops in these three pipe types at the entrance were obvious.In the90°elbow pipe,the inside pressure was less than the outside pressure after the bend,and the highest and lowest pressures appeared in the shunt of the T type pipe.The ice slurry flow experiment results showed that the specific pressure drop increased with the velocity and ice particle fraction.Among the three pipe types,the pressure drop of the straight pipe was the smallest,and that in the T type pipe was the largest.A comparison of the numerical simulation and experimental results showed that the pressure drop was consistent with the flow velocity within an error range of20%,but the simulated value was larger than the experimental value at high flow rates.