中文摘要：

基于标准k-ε湍流模型，采用SIMPLEC算法，在贴体坐标系下，通过求解时均化的Navier—Stokes方程，对离心泵蜗壳内部三维不可压湍流场进行了数值模拟。得到了离心泵蜗壳内速度、速度矩、压力等参数的分布，分析了蜗壳内部流动的特征。研究结果表明：蜗壳对称面上流动比较均匀，随着半径的减小，周向速度分量和径向速度分量逐渐增加，且径向速度分量增加得较快；各径向截面上，速度分布的对称性好，幅角Ф〉160°后，径向截面上出现二次流现象；速度矩沿径向的分布随半径增大略有提高，沿蜗壳幅角方向的分布不等于常数，但其平均值基本不变；蜗壳内压力分布较为均匀，只是在隔舌附近有较大的压力梯度；流量沿蜗壳包角的分布基本遵循线性规律。

英文摘要：

On the basis of time-averaged Navier-Stokes equation and standard k-ε turbulent model, the inner flow through the volute of centrifugal pump is numerically simulated in 3-D body-fitted coordinate by using SIMPLEC algorithm. The distributions of velocity, velocity moment, pressure and other flow parameters are obtained, and the properties of inner flow inside the volute are also analyzed. The calculation results exhibit the main flow characteristics in the volute as： on the symmetry section, the velocity distribution is nearly uniform, both circular and radial velocities are in inverse proportion to the radius; on radial sections, the velocity vectors are symmetric, and secondary flow occurs when the spiral angle is larger than; the velocity moment increases slightly with the radius in radial sections, while the distribution is not constant in spiral angle, but its averaged value tends to be a constant in the volutes a uniform static pressure distribution inside the volute is discerned except for a large pressure gratitude in the tongue; the distribution of flow rate follows a linear function with the spiral angle.