Author:
Zhang Wenlu,Deng Shuwen,Wang Tao,Jiang Bo,Wang Yuchuan
Abstract
Abstract
In order to understand the unsteady flow phenomenon of the centrifugal pump, the dynamic mode decomposition method (DMD) is introduced to extract the three-dimensional coherent structure of the rotating flow field in the impeller passage under three different working conditions of the double-suction centrifugal pump. The time series collection of flow field is constructed by CFD numerical simulation, and the approximate matrix characteristic parameters and different modal data are solved. The analysis results show that the position, form and spatial-temporal evolution of the coherent structure can be accurately captured by DMD method corresponding to a single frequency in the double suction pump. For the temporal evolution, the coherent structure corresponding to low frequency is the most stable and dominate the unsteady flow. For the spatial evolution, the coherent structure corresponding to even-fold rotational frequency mostly occurs near the pressure side of the blade at the outlet of the impeller, and the coherent structure corresponding to odd-fold rotational frequency is mostly located in the flow field inside the impeller or near the blade surface.
Reference15 articles.
1. Technology status and development trend of large irrigation pumping stations in China;Fujun;China Water Resources,2009
2. Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions;Weidong;Journal of the Brazilian Society of Mechanical Sciences and Engineering,2020
3. Investigation of Rotor-Stator Interaction and Flow Unsteadiness in a Low Specific Speed Centrifugal Pump;Ning;Journal of Mechanical Engineering,2016
4. Mechanism and experiment of speed measurement of centrifugal pump based on dynamic and static interference;Zhongyong;Transactions of the Chinese Society for Agricultural Machinery,2010