孔板管道下游流动加速腐蚀速率数值模拟研究

Numerical Simulation Study of Flow Accelerated Corrosion in Downstream of Orifice Pipe

采用计算流体力学方法中的k-ε模型模拟了孔板管道下游管壁与流体间的传质系数分布,并利用Sanchez-Caldera流动加速速率预测模型计算了孔板管道下游的流动加速腐蚀速率分布。结果表明,孔径比的减小会导致流动加速腐蚀敏感部位向孔板下游移动,入口流速的增大对孔板下游流动加速腐蚀敏感部位的位置无明显影响,pH值的增大能有效减小流动加速腐蚀速率。

The mass transfer coefficient distribution between the pipe wall and fluid was simulated by the k‐εmodel of computational fluid dynamic method .The distributions of flow accelerated corrosion （FAC） rate in downstream of orifice pipe were calculated by Sanchez‐Caldera model .T he results show that the sensitive position of FAC moves to downstream as decreasing orifice diameter ratio .However ,the increase of inlet velocity has no significant influence on sensitive position of FAC .The FAC rate can be effective‐ly reduced with increasing pH value .