摘要
基于标准k-ε双方程紊流模型,采用SIMPLE算法,通过求解时均化的Navier-Stokes方程,利用FLUENT软件对OC150-30型离心泵叶轮和压水室内部流场,按叶轮旋转位置的不同进行二维数值模拟和分析。研究表明:叶轮流道内流体的流速和压力呈明显非轴对称,最大动压强出现在叶片出口附近,并在叶片吸力面出现较大涡流区,当叶片旋转至蜗壳隔舌附近时叶轮出口出现回流;弯锥形扩散管内存在较大回流,将其改成直锥形扩散管后流场得到明显改善。
Based on the standard k-ε turbulence model, a 2D numerical simulation analysisof the internal flow field in the impeller and spiral chamber under the different impeller rotating position is made by the Reynolds-Averaged Navier-Srokes equation, with the simple algorithm and the fluent program. The study demonstrates that the fluid velocity and pressure in the impeller channel is axis-asymmetrical, and the most dynamic pressure is close to the impeller outlet, and there is a larger backflow zone in the suction surface of the blade, and there appears backflow in the impeller outlet when the blade rotates near the volute tongue, and larger vortex exists in the curved taper diffuse pipe, and backflow is improved with the straight taper diffuse pipe.
出处
《中国农村水利水电》
北大核心
2009年第3期72-75,共4页
China Rural Water and Hydropower
关键词
离心泵
叶轮
蜗壳
数值模拟
centrifugal pump
impeller
spiral casing
numerical simulation
