海底泥浆举升叶片圆盘泵轴向力预测

摘要

为计算海底泥浆举升叶片圆盘泵的轴向力,采用RNG k-ε方程湍流模型和标准SIMPLE算法对模型泵内全流道三维湍流进行数值模拟.在水力性能试验验证的基础上,得到轮毂轴端及叶轮表面的静压力分布,并预测叶轮轴向力.结果表明:叶轮内表面静压分布较均匀,前、后盘静压分布基本相同,叶轮内表面压力分布不均所产生的轴向力占总的轴向力比例很小;叶轮前、后盘外表面压力分布存在明显的不一致,特别是在泵出口附近,叶轮后盘压力要明显大于前盘压力,叶轮所受总的轴向力主要由叶轮前、后盘外表面压力分布不均产生.%To calculate axial thrust of disk pump with radial straight blade for subsea mudlift,the RNGk-ε turbulence model and the standard SIMPLE algorithm were applied to numerically simulate the three dimensional viscous flow inside the whole flow passage of a model pump. On the basis of experimental verification of hydraulic performance,the pressure distribution of the pump axial end face and the impeller surface were obtained and the value of axial thrust was calculated.The results show that:pressure distribution of front disk and back disk of impeller is almost the same,axial thrust generated by pressure distribution of inner surface of impeller accounted for a very small proportion of the total axial thrust, pressure distribution of outer surface is obviously different for front disk and back disk of impeller, pressure of back disk was significantly higher than that of front disk,axial thrust generated by pressure distribution of outer surface of impeller accounted for a very large proportion of the total axial thrust.