Analysis of the Influence of Guide Vane Wrap Angle and Number of Blades on the Propulsion Performance of a Water-Jet Propeller

In this paper, the propulsion performance of a screw mixed-flow jet propulsion pump is studied systematically. The optimum thrust performance is achieved by changing the geometrical dimensions of the guide vanes. Under the condition of keeping other parameters unchanged, the operating conditions of the pump can be effectively adjusted by changing the number of guide vanes and wrap angle. The focus of this paper is on the presentation and demonstration of a strategy that takes the number of guide vanes and wraps angle as the main research object and its propulsion efficiency as the main reference index to analyze the advantages and disadvantages of each working condition in detail. The CFD numerical simulation technology has been used for numerical calculation. The simulation results are compared with the experimental results, and the numerical calculation results are in good agreement with the experimental values. The results show that the kinetic energy of the propulsion pump increases with the number of guide vane blades and the angle of wrap angle. The increase of guide angle and the number of blades will reduce the overall propulsion efficiency of the propeller. Finally, a mathematical model of propeller efficiency with the number of guide vane blades and the angle coefficient of guide vanes is established.

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Analysis of the Impact of the Space Guide Vane Wrap Angle on the Performance of a Submersible Well Pump

Fluid Dynamics & Materials Processing ◽

10.32604/fdmp.2019.07250 ◽

2019 ◽

Vol 15 (3) ◽

pp. 271-284

Author(s):

Xiaorui Cheng ◽

Hongxing Chen ◽

Xiaoquan Wang

Keyword(s):

Guide Vane ◽

Wrap Angle ◽

The Impact

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The action mechanism of rotor–stator interaction on the hydraulic and hydroacoustic characteristics of the guide vane in a jet centrifugal pump

Modern Physics Letters B ◽

10.1142/s0217984920503960 ◽

2020 ◽

Vol 34 (34) ◽

pp. 2050396

Author(s):

Rong Guo ◽

Rennian Li ◽

Renhui Zhang ◽

Wei Han

Keyword(s):

Flow Field ◽

Transient Flow ◽

Guide Vane ◽

Centrifugal Pumps ◽

Action Mechanism ◽

Exterior Field ◽

Outlet Angle ◽

Rotor Stator Interaction ◽

Wrap Angle ◽

Hydrodynamic Noise

The aim of this study was to investigate the action mechanism of the rotor–stator interaction (RSI) in the transient flow field and hydrodynamic noise field of the guide vane in jet centrifugal pumps (JCPs). The numerical method of CFD (computational fluid dynamics), coupled with CFA (computational fluid acoustics), was used to analyze the correlation between the impeller parameters and the flow/sound characteristics of the guide vane. The results show that on the inlet surface of the guide vane, an impeller with fewer blades, a smaller wrap angle, a smaller outlet angle and a smaller outlet diameter is beneficial for reducing the pressure fluctuation intensity. When the guide vane geometry is constant, the evolution processes of the transient flow field inside the static and dynamic cascades are mainly related to the blade number and speed of the impeller. An impeller with more blades, a larger wrap angle, a smaller outlet angle and a smaller outlet diameter is beneficial for improving the flow field distribution in the dynamic and static cascades. The hydrodynamic noise in the interior field is mainly related to the fluctuation characteristics of the transient flow field, but that in the exterior field is related not only to the fluctuation characteristics of the transient flow field, but also to the structural properties of the JCP pump body. The hydrodynamic noise in the exterior field presents an obvious dipole symmetrical distribution on the meridional plane, and the minimum value appears in the direction of the rotation axis because of the symmetrical structural characteristics of the pump body. The modal-shaped features of the JCP lead to a sidelobe phenomenon on the sagittal plane.

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Influence of Guide Vane Wrap Angle Key Design Parameters on Hydraulic Performance of Nuclear Reactor Coolant Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.721.73 ◽

2014 ◽

Vol 721 ◽

pp. 73-77 ◽

Cited By ~ 1

Author(s):

Wei Nan Jin ◽

Rong Xie ◽

Mu Ting Hao ◽

Xiao Fang Wang

Keyword(s):

Flow Field ◽

Nuclear Reactor ◽

Guide Vane ◽

Three Dimensional ◽

Internal Flow ◽

Hydraulic Performance ◽

Design Parameters ◽

Coolant Pump ◽

Reactor Coolant ◽

Wrap Angle

To study the effects of guide vane with different vane wrap angles and relative positions of outlet edge on hydraulic performance of nuclear reactor coolant pump, three-dimensional steady numerical simulations were performed by using CFD commercial software Numeca. The results show that the vane wrap angle changes the head and power characteristics by changing the relative velocity angle in vane outlet. The inner flow field changes while the wrap angle changes. With the wrap angle increases, the shock loss in volute is reducing, but the friction loss in vane passages is getting large. So there exists an optimum wrap angle and relative positions of outlet edge that corresponds to the highest efficiency of a pump. Numerical simulation is performed with the two key design parameters optimized through surrogate model, the internal flow field is improved and then the hydraulic efficiency is improved.

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Test on Characteristics of the High-Pressure Secondary Rotary Water Gas Jet Ventilation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.594-597.2167 ◽

2012 ◽

Vol 594-597 ◽

pp. 2167-2170

Author(s):

Zhong Fei Ma ◽

Peng Gang Jin ◽

Feng Zhao

Keyword(s):

High Pressure ◽

Guide Vane ◽

Water Pressure ◽

Flow Characteristics ◽

Water Jet ◽

Gas Jet ◽

Jet Ventilation ◽

Water Gas ◽

The Relationship ◽

Vane Angle

In order to reduce the concentration of explosive gas, experimental research was carried out on the high pressure secondary rotating water jet ventilation characteristic, and the principle of high pressure secondary rotating water jet ventilation was analyzed. Experiments of the relationship between pressure and the suction air flow characteristics were carried out with different structure of jet pipe, different structure of nozzles, different throat in high pressure single rotating water jet ventilation, and the secondary rotating ventilation characteristic were tested with different guide vane angle. The results show that the air-sucking quantity approximatively increased with water pressure in accordance with parabola in the high press secondary rotating water jet ventilator, the air-sucking quantity of different structure of jet pipe was not same, the air-sucking quantity was significantly greater than that of swirl nozzle, the secondary rotary ventilation acts on the larger range.

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CFD-Based Match Design and Improving Performance for Francis Turbine Components

Volume 2: Fora ◽

10.1115/fedsm2008-55246 ◽

2008 ◽

Author(s):

Pengcheng Guo ◽

Xingqi Luo ◽

Xiaobo Zheng ◽

Shengzhu Liu

Keyword(s):

Guide Vane ◽

Rake Angle ◽

Design Tool ◽

Francis Turbine ◽

Angle Distribution ◽

Unit Speed ◽

Wrap Angle ◽

Exit Edge ◽

Spiral Casing ◽

Blade Wrap Angle

The CFD-based design tool is applied to investigate and improve the flow matching relationship and the hydraulic performance of Francis turbine components for a turbine rehabilitation project. At first numerical analysis of spiral casing with stay vanes was performed, the discharge angle distribution at the spiral casing outlet was obtained and according to the discharge angle distribution, the stay vanes were divided into 5 groups to correspond with the spiral casing discharge angle distribution. The circumferential relative position relationship between the stay vanes and the guide vanes was numerical investigated by altering the circumferential position of the stay vane, and the optimal matching relationship between the stay vane outflow angle and the guide vane inflow angle was obtained. Systemic measures of adopting negative rake angle blades, increasing blade number, increasing blade wrap angle, thickening blade exit edge, and reducing optimum unit speed were used to develop a new runner that replaced existing runner to damp the vibration of turbine units. And the model test comparison in the same conditions of the new runner and existing runner was carried out and the results showed that the severe vibration of the power building floor was eliminated.

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