在役油罐内壁除锈喷嘴外流场数值模拟

针对在役单层油罐改造成双层罐的除锈问题,选用磨料水射流喷嘴为研究对象,使用计算流体力学方法,进行了混合磨料水射流对油罐内壁除锈效果的数值模拟。以射流打击靶面的最大剪切力和冲蚀磨损率作为评价指标,研究结果表明:前混合磨料水射流达到相同的除锈效果相较于后混合磨料水射流所需的射流压力更低,射流入射压力为20 MPa时,除锈效果较理想且具有较好的经济性;剪切力在靶面上存在一个核心作用区,最大剪切力位置不在靶面中心处;冲蚀磨损率随磨料的体积浓度、磨料粒径、磨料密度的增大而增大,而最大壁面剪切力不随其增大而变化。

Numerical simulation of flow field outside the nozzle for rust removal on the inner wall of the service tank

Abrasive water jets were selected to solve the problem of derusting of single layer oil tanks, which will be reformed into double-layer tanks. The effect of mixed abrasive water jet on the rust removal of inner wall of oil tank were evaluated by using computational fluid dynamics(CFD). By evaluating the maximum shear stress and the erosion rate of the jet impact target surface, the results show that the pressure of pre-mixed abrasive water jet is lower than that of the post-mixed when they perform the same rust removal effect. When the jet pressure is 20 MPa,the rust removal effect is most effective. The distribution of shear stress has a core area on the target surface, and the maximum shear stress is not at the center of the target surface. The erosion rate increases with the increase of the volume concentration of abrasive, the abrasive particle size, and the abrasive density, while the maximum wall shear stress does not change with it.