矿用混凝土湿喷机喷嘴的评价指标与流场仿真模拟

摘要

The general evaluation index was proposed for mine concrete wet spraying machine nozzle.The flow field of SPB7-T wet spraying machine nozzle was studied with Fluent.Mixture static stress nephogram,single phase velocity contours and the volume fraction contours of nozzle exit phase were analyzed in nozzle flow field.According to the results,the static pressure of mixture and velocity of each phase increases along the moving direction of concrete;there is a velocity slip between high pressure air and concrete;the air mixing uniformity is 0.85 in the nozzle exit.The tests show that the resilient rate of the nozzle for SPB7-T wet spraying machine is 9.993%,which proved the correctness of the simulation.%提出了矿用混凝土湿式喷射机喷嘴的一般评价指标,选用Fluent模拟软件,对SPB7-T型湿喷机喷嘴内流场进行了仿真模拟,得出了喷嘴流场内混合物静态压力云图、单相速度云图以及喷嘴出口处相体积分数云图的模拟数据.结果表明:喷嘴流道内混合物的静态压力和各相速度均沿着运动方向增大,高压空气和混凝土两相之间存在速度滑移现象,喷嘴出口处空气混合均匀度达到0.85.通过实际喷射试验,测得SPB7-T型湿喷机喷嘴的回弹率为9.993%,验证了上述模拟仿真的正确性.