大管径管道冰浆流动阻力特性实验研究

Experimental study on flow resistance characteristics of ice slurry in pipelines with large diameter

分别针对DN50和DN802种大管径管道开展了冰浆流动阻力特性实验研究,实验均处于湍流。实验发现:在低雷诺数下,冰浆阻力系数远大于适用于纯水单相流的Blasius关联式计算值,且含冰率越大,阻力系数越大;而在高雷诺数下,冰浆的阻力特性符合Blasius关联式,不同含冰率下的阻力系数都与纯水一致;含冰率和管径对冰浆阻力系数何时进入Blasius曲线有影响,含冰率越大、管径越大,则开始进入Blasius曲线的雷诺数越大;相较于直管,弯头的临界流速更高,更容易出现堵塞,且含冰率越大,临界流速越大。

This paper conducts an experimental study on two pipelines with large diameter including DN50 and DN80 pipelines,and the flow in the experiments is in turbulence.It is found that,at low Reynolds number,the resistance coefficient of ice slurry is much higher than that of pure water with single-phase flow which follows the Blasius correlation,and the higher the ice packing fraction is,the higher the resistance coefficient is.At high Reynolds number,the resistance characteristics of ice slurry tend to follow the Blasius correlation,and the resistance coefficients of different ice packing fractions are consistent with those of pure water.Both the ice packing fraction and pipeline diameter have an influence on when the ice slurry resistance coefficient enters the Blasius curve.The larger the ice packing fraction is and the larger the pipeline diameter is,the greater the Reynolds number entering the Blasius curve is.Compared with the straight pipeline,the critical velocity of the elbow is higher and the elbow is more prone to blockage,and the higher the ice packing fraction is,the greater the critical velocity is.