Optimum Design of Water Jet Pumps

1969 ◽  
Vol 91 (1) ◽  
pp. 62-68 ◽  
Author(s):  
J. R. Cairns ◽  
T. Y. Na
Keyword(s):  
Optimum Design ◽  
Water Jet ◽  
Jet Pump ◽  
Analytical Work ◽  
Jet Pumps ◽  
Extensive Program

A summary of an extensive program of experimental and analytical work leading to a procedure for obtaining optimized performance of water jet-pump systems is presented. The procedure is extended to include systems involving n, series-staged ejector components operating in an optimal manner as a complete pump, pipeline, ejector unit. The theoretical, limiting performance of ejectors is established and several examples involving different design situations are shown.

CFD Investigation of Global Performance and Three Dimensional Flows in a Water-Jet Axial Flow Pump

2005 ◽  
Author(s):  
Hong Gao ◽  
Wanlai Lin ◽  
Fangming Ye
Keyword(s):  
Three Dimensional ◽  
Axial Flow ◽  
Flow Fields ◽  
Water Jet ◽  
Jet Pump ◽  
Wall Functions ◽  
Global Performance ◽  
Jet Pumps ◽  
Axial Flow Pump ◽  
Radial Loading

The purpose of the present study is to investigate the global performance and three dimensional flow fields in a water-jet pump. TASCflow software is employed to simulate the rotator-stator coupling flow field. A standard k-ε turbulence model combined with standard wall functions is used. In order to investigate the effect of a rear stator on flow fields, the flows in two water-jet pumps with and without a rear stator are studied. The CFD predicted global performances are in good agreement with the experimental results. Then the flow fields, such as the pressure distribution on the blade surfaces, the axial and tangential velocities distribution, especially the radial loading distribution are investigated at different flow rates. In addition, the effect of a rear stator and different spacing between the rotor and the stator on the global performance and the flow fields of the water-jet pump are also investigated.

scholarly journals Assessment of Cavitation Erosion in a Water-Jet Pump Based on the Erosive Power Method

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Ning Qiu ◽  
Han Zhu ◽  
Yun Long ◽  
Jinqing Zhong ◽  
Rongsheng Zhu ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Water Jet ◽  
Power Method ◽  
Jet Pump ◽  
Tip Leakage ◽  
Long Duration ◽  
Simulation Based ◽  
Jet Pumps ◽  
Sst Turbulence Model ◽  
Simulation Error

Cavitation affects the performance of water-jet pumps. Cavitation erosion will appear on the surface of the blade under long-duration cavitation conditions. The cavitation evolution under specific working conditions was simulated and analyzed. The erosive power method based on the theory of macroscopic cavitation was used to predict cavitation erosion. The result shows that the head of the water-jet pump calculated using the DCM-SST turbulence model is 12.48 m. The simulation error of the rated head is 3.8%. The cavitation structure of tip leakage vortex was better captured. With the decrease of the net positive suction head, the position where the severe cavitation appears in the impeller domain gradually moves from the tip to the root. The erosion region obtained by the cavitation simulation based on the erosive power method is similar to the practical erosion profile in engineering. As the net positive suction head decreases, the erodible area becomes larger, and the erosion intensity increases.

Performance Prediction of Cavitating Water-Jet Propulsors Using a Viscous/Inviscid Interactive Method

2008 ◽  
Author(s):  
Hong Sun ◽  
Spyros A. Kinnas
Keyword(s):  
Viscous Flow ◽  
Performance Prediction ◽  
Water Jet ◽  
Interaction Method ◽  
Jet Pump ◽  
Interactive Method ◽  
Sheet Cavitation ◽  
Jet Pumps

The authors present a viscous/inviscid interaction method to predict the viscous flow inside water-jet pumps, including the effects of sheet cavitation on the rotor and /or stator blades. The circumferentially averaged interaction between the rotor and the stator is accounted for in an iterative manner. The method is applied in the case of an actual water-jet pump and comparisons of the predicted and the measured rotor torque are presented.

Experience Concerning 1200-psi Naval Steam Generators

1969 ◽  
Vol 6 (03) ◽  
pp. 254-267
Author(s):  
J. E. Kaune ◽  
W. A. Fritz
Keyword(s):  
Training Program ◽  
Optimum Design ◽  
Steam Generators ◽  
Auxiliary Equipment ◽  
Operation And Maintenance ◽  
Naval Ship ◽  
Boiler Operation ◽  
New Type ◽  
Extensive Program ◽  
Maintenance Requirements

At a meeting held in the Naval Ship Engineering Center, Philadelphia Division, in January and February 1967, the following were found to be the principal reasons for the 1200-psi-boiler problems:Introduction of a new type of boiler without a sufficient training program;lack of a sufficient supply parts backup;lack of adequate manuals and documentation;lack of sufficient auxiliary equipment to assist in boiler operation and maintenance, and lack of optimum design features. This paper describes the aforementioned problems and what has been and is being done to improve conditions. An extensive program is now underway to vastly improve overall boiler reliability and decrease maintenance requirements.

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