... Abstract The Detached Eddy Simulation (DES) has been used to simulate the pressure fluctuation of the impeller in an axial flow pump. The results were combined with experiments including high-speed photography and transient pressure measurements to investigate the unstable flow induced by tip...

... of IGV angle and blade pitch angle, because the relative velocity at leading edge played an important role in the performance under overload conditions. axial-flow pump inlet guide vane blade pitch angle pressure fluctuation INVESTIGATION OF UNSTEADY PERFORMANCE CHARACTERISTICS...

... performances that the inlet vane has made is specifically simulated and compared. The flow fields of the inlet tube influenced by the vane is also investigated on the vortex distribution and velocity vector distribution. The MOD1 has a generally smaller pressure fluctuation amplitude than the prototype...

... of the pressure fluctuation, thus the pressure fluctuation exiting within the pump cannot be neglected because of its direct influence on the noise and vibration performance. Therefore, reducing the pressure fluctuation intensity is a key point for research. The side channel pump studied in this paper...

... Pressure fluctuations acting on centrifugal pump contain a lot of dynamic information, such as rotor-stator interaction, vortex, backflow, and so on. By CFD method, calculations of three-dimensional unsteady flow in the suction chamber, impeller, annular chamber, inlet and outlet were conducted...

... and experimental tests. Nowadays, the requirements in terms of precision lead us to develop new and original techniques to model the fluid physics inside the pump. So, the accurate prediction of the pressure fluctuations is very sensitive and many considerations are essential for this purpose such as the correct...

... 06 06 2012 In order to reveal the characteristics of pressure fluctuation in centrifugal pump, based on finite volume method, RNG k–ε turbulence model and sliding mesh, the three-dimensional unsteady incompressible viscous flow in a low-specific-speed centrifugal pump is simulated...

..., the axial velocity distribution at stator outlet is also mainly affected by the stator blade numbers, but its phase does not change cyclically. axial pump rotor-stator interaction unsteady turbulent flow pressure fluctuation velocity distortion Proceedings of ASME-JSME-KSME Joint Fluids...

... Pressure fluctuation is a common problem in large-scale hydraulic turbine, which will affect the performance of the water turbines, such as negatively affecting the efficiency, increasing the damage of related components and decreasing the life span, bringing up great potential troubles...

... The pressure fluctuations in a centrifugal pump at both design and off-design points and the internal electromagnetic field of canned motor are presented in this paper. The 3D unsteady flow numerical simulation is completed at different operating points by using the FLUENT. A sliding mesh...

... 30 07 2010 A numerical investigation was carried out in a volute type centrifugal pump to study the influence of splitter blades and radial gap and decrease the pressure fluctuations levels at the blade passage frequency for the same operating conditions. In this kind of turbomachinery...

... 30 07 2010 The flow structures and the pressure fluctuations in a centrifugal pump at both design and off-design points are presented in this paper. The flow structures are numerically obtained by solving the viscous incompressible Navier-Stokes equations with a 3D unsteady flow model...

... 30 07 2010 Adopting the Reynolds averaged Navier-Stokes equation and RNG k-ε turbulent model, the unsteady flow in the double channel pump is simulated with sliding mesh technique. Detecting points in the impeller and volute passages are to capture the pressure fluctuation law...

... 10 07 2009 The pressure fluctuation taking place at the whole passage of a prototype Francis hydraulic turbine is studied by carrying out both experimental and numerical simulation. Unsteady wall pressure measurements at six different typical operating conditions are performs...

... pattern under 9 guide vane openings are obtained, and detailed analysis is focused on flow in the draft tube to obtain variation of pressure distribution on symmetry surface of the draft tube with respect to time and pressure fluctuation of all test points in the turbine. Comparison between simulation...

... 26 03 2009 The pressure fluctuation caused by swirling flow in draft tube is one of the main reasons of vibration in hydraulic turbine. It directly affects the steady operation of hydraulic turbine unit. The pressure fluctuation in draft tube of a large Francis turbine can’t...

... transportability. The objectivity of the experimentally-identified flow regimes and their transition conditions was verified by the application of a Kohonen self-organizing neural network. Flow regimes three-phase power spectrum density pressure fluctuation artificial neural network transportability...

... Kaplan Hydraulic Turbine Three-Dimensional Turbulent Flow Unsteady Pressure Fluctuation In recent years, stability research of the hydraulic turbine has been one of the most important problems of analysis of the large turbines. In this paper, the simulation model is based on the large...