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Chen H.,Shanghai University | Chen H.,Shanghai Key Laboratory of Mechanics in Energy Engineering | Liu W.,Shanghai East Pump Group Co. | Jian W.,Shanghai East Pump Group Co. | And 2 more authors.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2011

The efficiency of a low specific-speed centrifugal pump is low, it is very difficult to improve its efficiency due to the large impeller diameter, narrowed blade width and severe diffusion in the flow passages. Based on CFD numerical simulations and performance tests, a relationship between efficiency and internal flow characteristics of a low specific-speed centrifugal pump was analyzed to establish a basis for improving the flow structure in impeller and increasing the pump efficiency. The updatedimpellers, which were respectively with two types of blade structure proposed by using boundary layer control techniques, were developed. In order to analyze and compare easily, the main geometric parameters of the new impellers, such as diameter, width and installation size, were consistent with the original impeller. All the experiments on pump performance were conducted in the same casing. The experimental results show that the efficiency of pumps with splitter blades is improved in large capacity region, but the flow range is not extended. The efficiency of the pump with drainage blades is improved significantly at every flow rate. Further, the maximum flow rate is extended. The flow control techniques have been applied successfully to improve the flow pattern in impellers and the pump efficiency.

Meng G.,Tsinghua University | Tan L.,Tsinghua University | Cao S.L.,Tsinghua University | Jian W.,Shanghai Eastpump GROUP CO. | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2015

Cavitation is an unsteady phenomenon, which is nearly inevitable in pumps. It would degrade the pump performance, generate vibrations and noises, and even erode pump flow passage components. The double suction centrifugal pump at design flow rate and large flow rate is numerically simulated using the k-ω turbulence model and the mass transport cavitation model. As a result, the calculated variation of pump head with pump inlet pressure agreed well with the experimental data. The results demonstrate that the numerical model and method can accurately predict the cavitation flows in a double suction centrifugal pump. The cavitation characteristics are analysed in great details. In addition, based on the calculation results, the reason that the plunge of pump head curve is revealed. It is found that the steep fall of pump head happens when the cavity reaches the blade to blade throat and the micro-vortex group appears at the back of the blade suction side. At the same time, this practice can provide guidance for the optimal design of double suction pumps.

Ma P.-F.,Huazhong University of Science and Technology | Wang J.,Huazhong University of Science and Technology | Shan D.,Huazhong University of Science and Technology | Liu W.-W.,Shanghai East Pump Group Co | Yang Y.,Shanghai East Pump Group Co
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2013

Blading density degree is one of the important parameters in axial pump design. For researching the effect of blading density degree on the performance of the pump, three models with different blading density degrees were designed by lifting design method and all of them can meet the design objectives. Then this article derived the relationship between geometric parameters and energy parameters of the pump. After that, numerical simulations were implemented for models to compare the internal flow characteristics and external characteristics. The simulation results showed that the flow distribution law of three models had no much difference and, with the increase of blading density degree, blade static pressure distribution became more reasonable and efficiency increased, while the optimal operating point offset to the small flow. However, there was a strong fluid impinging occurred at the edge of the blade inlet.

Ma P.,Huazhong University of Science and Technology | Wang J.,Huazhong University of Science and Technology | Li H.,Huazhong University of Science and Technology | Liu W.,Shanghai East Pump Group Co
International Conference on Power Engineering 2013, ICOPE 2013 | Year: 2013

Pressure fluctuation is one of the key factors that cause noise and unstable operation of pump unit. In order to study pressure fluctuation properties in two-way axial flow pump, comparison of external characteristics between steady numerical simulation results and test results was performed firstly for bidirectional axial-flow pump of which the approximate specific speed was 1600. It demonstrated that the simulation method and grid used for this pump had a reasonable accuracy. And then, this paper simulated the three-dimensional unsteady flow field of the pump based on standard k-ε model and analyzed the time-domain of each monitoring points in different position. The results showed that the vane has an obvious effect on pressure fluctuation variation of the pump and; the maximum pressure pulsation occured near the edge of the blade inlet during both positive and negative operation. This research will provide certain references to reveal pressure fluctuation variation rules in bidirectional axial-flow pump.

Ma P.,Huazhong University of Science and Technology | Wang J.,Huazhong University of Science and Technology | Liu W.,Shanghai East Pump Group Co. | Cai K.,Shanghai East Pump Group Co.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2015

In order to investigate the best relative position between elbow and guide vane, a high specific speed bidirectional axial-pump was chosen as the study object to analyze the cause of numerical simulation results change, which occurred when guide vane grid rotated. It was found that the relative positions both between vane and blade and between vane and elbow can affect the steady numerical simulation results. Then the flow field of passage without guide vane and blade was simulated by the LES (Large Eddy Simulation) method, the cause of pump performance change was analyzed, and the result was verified by comparing the flow field of guide vane area at different positions. The results show that the pump performances at different positions of guide vane have a certain difference, and the inlet incidence angle of guide vane may deviate from the design angle. It can be used to reduce the influence of elbow on pump performance by extending diffusion tube, reducing elbow angle and adjusting guide vane arrangement in design. ©, 2015, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.

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