3D numerical simulation of internal flow in NTB multi-stage ceramic pump
Yuan Shouqi1, Tao Yi1, Cao Weidong1, Tang Yue1, Tao Jianping2
1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Province Yixing Taoye Nonmetallic Chemical Machinery Factory Co. Ltd., Wuxi, Jiangsu 214222, China
Abstract：The 3D modeling and grid meshing of the NTB multi-stage ceramic pump were achieved referring to the CAD hydraulic design. Based on the Reynolds Time-Averaged N-S equations with the standard k-ε turbulence model in the multiple reference frame, the internal flow in the multi-stage ceramic pump under nine different working conditions including design point were simulated by using CFX software. The static pressure contours, velocity vectors and streamlines were obtained. The principles of the internal flow under large flow rates, small flow rates and design condition were qualitatively analyzed, meanwhile, the performance curves of the pump were drawn. The simulation results show that the distribution of absolute velocity vector under design working condition is reasonable. No backflow is found in the outlet of the volute. The velocity in the outlet of reverse diffuser changes little and the velocity vector is uniform, but axial vortex occurs there. The streamlines in the middle sections of both impellers are asymmetric. There are different scales of jet-wake structures in the first-stage impeller under three working conditions and axial vortex is found under small flow rate conditions. Based on the simulation, the model of the NTB multi-stage ceramic pump was manufactured, and the hydraulic characteristics were tested. The results of simulation and experiment were compared.The computational and experimental results present good agreement and the model pump satisfies the design requirements which show that the NTB multi-stage ceramic pump is successfully developed. Meanwhile, the results of simulation can provide foundation for optimization design.
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