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Yang F.,Yangzhou University | Yang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Liu C.,Yangzhou University | Liu C.,Hydrodynamic Engineering Laboratory of Jiangsu Province
Journal of Engineering Science and Technology Review | Year: 2013

The Investigation of the three-dimensional (3D) fluid flow inside a slanted axial pumping system, based on the Reynolds time-averaged Navier-Stokes equations and the RNG k-ε turbulent flow model, applying the multiple reference frames. The flow detail of whole slanted axial pumping system is attained. The relation between hydraulic performance of outlet sections with rotating impeller and installation height of pumping system and the stress distribution of impeller is analyzed, so is the relative velocity distribution near the airfoil cross sections under the designed condition. The hydraulic moment under different conditions was calculated based on the numerical results, and the changing features of hydraulic moment on blades with flow rates are analyzed. The reference nominal height of pump is put forward. The comparison of simulation results and the experiment data shows that the calculation performance closes agrees with the experiment results at the best efficiency and designed operating conditions, but under the condition of low rate, deviations exist between the two results. Using CFD method to simulate the internal flow field of slanted axial pumping system can provide the basis for the hydraulic design of the slanted axial pumping system or its optimization. © 2013 Kavala Institute of Technology. Source


Liu C.,Yangzhou University | Yang F.,Yangzhou University | Yang H.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Yan B.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Tang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013

In this study, CFD numerical simulation was used for optimum design of suction and discharge passages of pump system to minimize flow resistance, and two sets of new tubular pump were developed, one with plane S-shaped shaft extension and another with facade S-shaped extension. Experiments of model pumps with these new designs were conducted on a high precision hydraulic machinery test stand to measure their energy, cavitation and runaway features. The results show that the plane and facade extension systems have a peak efficiency of 83.32% and 83.55% at blade angle -4° and -2° respectively. These two sets of new tubular pump have advantages of high efficiency and energy-saving. © Copyright. Source


Yang F.,Yangzhou University | Yang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Tang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Liu C.,Yangzhou University | And 2 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

To investigate the unsteady turbulenct characteristics of a large-scale volute mixed-flow pump system, a RNG k-ε turbulence model and the technology of transient rotor stator (TRS) were applied to flow simulation on the CFD software ANSYS CFX, with a detailed analysis of the three-dimensional unsteady turbulent flows in the volute passage. Amplitude and frequency of pressure pulsations at several monitoring locations of the passage components were analyzed, and radial hydraulic forces in different operating conditions were obtained. Based on the simulations of unsteady flows, performance data of the system were predicted and compared with those of steady flow. The results show that the pulsation amplitude and radial hydraulic force are smaller at design condition compared with large or low flow rate and the dominant pulsation frequency in the outlet section is equal to blade frequency. The pressure pulsations at two locations on the "ω" back wall of inlet passage are almost the same. Performance predictions based on unsteady flow simulations are closer to the test data than those on steady simulation, with insignificant differences between the two though. Source


Yang F.,Yangzhou University | Yang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Liu C.,Yangzhou University | Liu C.,Hydrodynamic Engineering Laboratory of Jiangsu Province | And 4 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2014

In order to study on the evolution law of shaft profile line and the influence of shaft passages on internal flow mechanism and operational stability of pumping system, 4 different shaft passages were designed by using one-dimensional hydraulic design method based on the induction analysis of shaft profile lines. ANSYS CFX soft was used to simulate the three-dimensional fluid flow of pumping system, and the hydraulic performance of different shaft inlet passages were analyzed quantitatively. Dimensionless momentum parameter analysis was used to compare the influence of different inlet passages on the operation stability of pumping system. With the increase of flow coefficient, the dimensionless momentum parameter decreases in the flow coefficient range from 0.317 to 0.634. Different inlet passages have little effect on the operation stability of pumping system. The effect of different inlet passages on the comprehensive hydraulic performance of pumping system was analyzed comparatively by using the weighted performance of multiple operating conditions evaluation method(M. P. I), which could be used in comparison and analysis of comprehensive hydraulic performance and scheme optimization of pumping system. For verifying the accuracy and reliability of the calculation results, its performance experiments were conducted. It is found that the calculated results agreed well with the measured results. Source


Liu C.,Yangzhou University | Liu C.,Hydrodynamic Engineering Laboratory of Jiangsu Province | Yang F.,Yangzhou University | Yang F.,Hydrodynamic Engineering Laboratory of Jiangsu Province | And 3 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

To further study the internal flow characteristics of high-efficiency S-shape shaft extension tubular pump system, three-dimensional steady flows in a pump system were simulated by CFD and the internal flow patterns at large and small flows and optimum operating conditions were obtained. For an optimal pump system that has a blade angle 0°, a flow coefficient KQ=0.492, and a head coefficient KH=0.830, its highest efficiencies of 82.57% and 81.00% were measured and calculated respectively. In the inlet passage, axial velocity distribution uniformity is 97.51%, and velocity-weighted average angle 88.8°, with a hydraulic loss of 3.89cm. At the optimum operating condition the calculation of pipe efficiency is up to 98.50%, in the range of normal operation the maximum velocity of 1.429 m/s meets the requirement of National standard (GB50265-2010), and under large flow rate vortices appeared in a small top region of the discharge elbow. The predictions of performances were compared with measurements, and it is found that both agree well. The overall flow pattern of this optimal pump system is uniform and smooth and the hydraulic loss is very small, indicating its superior hydraulic performances. Source

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