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This paper presents a procedure for design optimization of a Multiphase pump used for offshore plants. The Multiphase pump consists of a Helico-Axial type impeller with three blades and diffuser with eleven vanes. Variables and ranges defining blade angles of impeller and diffuser were selected as design variables for influences evaluation by using 2K factorial method. Based on the selected variables,...
Renewable energy sources which are gaining popularity over conventional resources mostly produce intermittent power as they fall under the influence of natural phenomena as daily cycle or weather conditions. However, worldwide remarkable growth of electricity generation from renewable resources in the recent years has resulted in the decentralized production posing network load stability problems,...
The flow in a pump sump is a very complicated one, which has three dimensional flow patterns, deformed free surface, and many unsteady vortices. As the model testing has a problem of similarity, CFD simulation method attracts attention in these days. In this study, a model case flow in the pump sump with simplified shape is simulated numerically. The flow is simulated as three-dimensional with free...
In order to investigate the influence of velocity circulation on the hydraulic performance of large axial-flow pumping stations, an accurate prediction method is necessary to be built. In this paper, vortex flows of pumps with internal cavitation and non-cavitation are firstly described by the velocity circulation theory. And then a CFD model, i.e., SST k-omega turbulence model is used to calculate...
To study the effect on hydraulic performance of Serial-Parallel Centrifugal Pumps (SPCP) is caused by the non-uniform flow. In fact, the motor of the pump is easily burnout when the pump is working by large flowing capacity and high head. The paper adopted by the velocity triangle theory, the computational formula of the max shaft power and the corresponding flows of the Single-Stage Model Pumps (SSMP)...
Xingshipo pumping station is the last stage pumping station of the Water Diversion Project from Yellow River to Jiaodong and it is the key of the project. The flow pattern in inlet structure of a pumping station influences greatly on the inflow condition of pumps and the operation status of the pump unit. In this paper, based on the RANS method, the standard k-e turbulence model together with FVM...
Elbow-type suction box is widely applied to China's large and medium-scale vertical pumping systems. The bottom slab of elbow-type suction box in the inlet segment can be horizontal or has an upward angle, the cross-sectional area of which is gradually contracted along the way from the inlet section to the outlet section and the flowing water is gradually accelerated. Characteristic of small hydraulic...
Wave power generator uses the surface water displacement as an energy source. The pitching motion of the device causes a column of water to rise and fall periodically in the double-hull housed caisson, creating a bi-directional flow. A cross-flow turbine uses this bi-directional flow for self-start and causes the rotation of turbine in a single direction. The turbine does not have direct contact with...
The pump-turbine impeller is the key component of pumped storage power plant. Current design methods of pump-turbine impeller are private and protected from public viewing. Generally speaking, the design proceeds in two steps: the initial hydraulic design and optimization design to achieve a balanced performance between pump mode and turbine mode. In this study, the initial impeller blade design is...
This work presents a numerical study of forward centrifugal fan. The study has been carried out to investigate the effect of impeller blades shape on fan performance and noise. Four models have been designed in different shapes of the blades curve. Computational fluid dynamics (CFD) software FLUENT has been applied to establish three-dimensional model of centrifugal fan. A steady and transient, Reynolds-averaged...
Turbine operation range has had to be extended to meet economic requirements in recent years. Specifically, efficiency under partial flow conditions has been improved by the development of low loss runners. The most effective runner design achieves suitable flow distribution from the runner exit, because the loss mechanism in the partial flow is due to swirl loss in the draft tube. In this study,...
For a container ship, B573, a wake field in the sense of a non-uniform low velocity distribution occurs behind it. To improve wake current distribution and to enhance propeller efficiency, the container ship model is numerically studied using a computational fluid dynamics (CFD) method. The simulated wake field of the ship includes the bare hull with a symmetry accelerating duct, namely duct 37A....
The dynamic characteristics of the sliding bearing have great influences on the vibration and stability of the rotor-bearing coupled system. This study focus on a water lubricated bearing which supports the vertical rotor in a test facility. This rotor system is designed with maximum rotational speed of 5000 rpm and used to study the influence of water bearing on the rotor dynamics. Based on the unsteady...
Insufficient understanding of large deviations between theoretical efficiency and measured efficiency is a major problem encountered in the water-jet propulsion design and application. Therefore, reason analysis of the poor efficiency is necessary. In this paper, CFD was directly adopted in the hydraulic loss distribution of water-jet propulsion. At reliable conditions, nearly 50% hydraulic losses...
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