Unsteady Flow Structure and Global Variables in a Centrifugal Pump
Unsteady Flow Structure and Global Variables in a Centrifugal Pump
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DOI：
10.1115/1.2234782
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发表时间：
2006-09
影响因子：
2
通讯作者：
J. González;C. Santolaria
中科院分区：
文献类型：
--
作者：
J. González;C. Santolaria
本文给出了低比转速离心泵的整体变量与数值计算得到的动态流场结构之间的关系。本文采用一种非定常流动模型，对单级商用泵叶轮和蜗壳内的流动特性与动态场进行了关联。实际上，粘性不可压缩Navier-Stokes方程是在三维非定常流动模型中求解的。滑移网格技术被应用到考虑叶轮-蜗壳的相互作用。在数值模型已成功地与实验数据比较的非定常压力波动模式的蜗壳护罩，一个新的步骤，提出了一个新的步骤，以相关的观察到的影响与泵内的流动结构。特别是，作为叶轮叶片的相对位置的函数的扭矩与叶片负载有关，并且蜗壳中的二次流与数值获得的不同压力模式有关。对不同蜗壳截面的螺旋度进行了局部流动分析和定性研究。提出的研究的主要目标是成功的局部和全局参数的离心泵中的流动的相关性。压力似乎是在叶轮和蜗壳中建立流动特征的主要驱动机制，适用于广泛的操作条件。
A relationship between the global variables and the dynamic flow structure numerically obtained for a low specific speed centrifugal pump is presented in this paper. A previously developed unsteady flow model is used to correlate the dynamic field with the flow characteristics inside the impeller and volute of a single-stage commercial pump. Actually, the viscous incompressible Navier-Stokes equations are solved within a 3D unsteady flow model. A sliding mesh technique is applied to take into account the impeller-volute interaction. After the numerical model has been successfully compared with the experimental data for the unsteady pressure fluctuations pattern in the volute shroud, a new step is proposed in order to correlate the observed effects with the flow structure inside the pump. In particular, the torque as a function of the relative position of the impeller blades is related to the blades loading, and the secondary flow in the volute is related to the different pressure patterns numerically obtained. Local flow analysis and qualitative study of the helicity in different volute sections is performed. The main goal of the study presented is the successful correlation of local and global parameters for the flow in a centrifugal pump. The pressure forces seem to be the main driven mechanism to establish the flow features both in the impeller and volute, for a wide range of operating conditions.