scholarly journals INFLUENCE OF THE CORROSION FACTOR ON THE CAVITATION WEAR RESISITANCE OF SHIP PROPELLER ALLOYS

2020 ◽  
pp. 91-100
Author(s):  
Yuriy N Tsvetkov ◽  
◽  
Evgeniy O. Gorbachenko ◽  
Roman N. Larin
Keyword(s):  
Corrosion Factor ◽  
Cavitation Wear ◽  
Ship Propeller

scholarly journals Measuring diameter of water jets affecting propeller blade surface under cavitation wear

2021 ◽  
Vol 2021 (1) ◽  
pp. 54-64
Author(s):  
Yuriy Nickolayevich Tsvetkov ◽  
Yaroslav Olegovich Fiaktistov ◽  
Evgeniy Olegovich Gorbachenko
Keyword(s):  
Hydrodynamic Cavitation ◽  
Cold Hardening ◽  
Mean Deviation ◽  
Blade Surface ◽  
Propeller Blade ◽  
Water Jets ◽  
Proportional Relationship ◽  
Cavitation Wear ◽  
Propeller Blades ◽  
Ship Propeller

The article analyses the structure of cavitated areas of the ship propeller blades made from aluminum bronzes with different composition. The most informative zones of cavitation wear are the cold-hardening zone and the peripheral one that help estimate the mechanical parameters causing the cavities to collapse. The dents formed on the metal surface in the process of hydrodynamic cavitation wear have spherical parts on their bottoms, in which it is possible to inscribe a circle of a definite diameter. There were conducted the experiments on forcing the ball indentors into the surface of different metal alloys. The first run of the experiments includes forcing of a steel ball with a diameter of 1.588 mm into the surface of 33 alloys with different hardness under the loads of 1 470, 980 and 588 N. The impression diameters were measured using Brinell magnifying glass. There has been found the power dependence between deformation of dents on the metals tested under hydrodynamic cavitation and hardness of the materials, which is similar to the dependence of deformation after forcing the ball indentors into the alloys of different hardness. The second run of the experiments included modeling the cold-hardening zone of the cavitation wear area by repeated forcing the ball indentors with the diameters of 1.588, 2.5, 3.175 and 5.0 mm into the bronze BrAZhNMts9-4-4-1 plates with area of 100 × 50 × 20 mm. Forcing was made into the side 100 × 50 mm previously ground and polished. The equal strain rate in impressions of different diameters was observed during forcing. A direct proportional relationship was obtained between the arithmetic mean deviation of the surface profile and the indenter diameter. The arithmetical mean deviation of the assessed profile of the side plotted against the ball indentor yields a direct proportional relationship. Using the dependence for the case of cavitation attack on the propeller blades helps to infer that the diameter of water jets striking against the propeller blade surface with diameter of 3 700 mm makes about 10 mm. The obtained value allows to choose reasonably the experimental equipment and the parameters of testing the ship propeller materials for cavitation wear.

Resistance and wake distortion optimization of JBC considering ship-propeller interaction

2022 ◽  
Vol 244 ◽  
pp. 110376
Author(s):  
Zhiqiang Liu ◽  
Weiwen Zhao ◽  
Decheng Wan
Keyword(s):  
Wake Distortion ◽  
Ship Propeller

Circumferentially nonuniform ship propeller inflow

1957 ◽  
Vol 4 (38) ◽  
pp. 520-530
Author(s):  
B.V. Korvin-Kroukovsky ◽  
Winnifred R. Jacobs
Keyword(s):  
Ship Propeller

scholarly journals CAVITATION WEAR OF PUMP IMPELLERS

2016 ◽  
Vol 2 (1) ◽  
pp. 40-44 ◽  
Author(s):  
Mirosław Szala ◽  
Daniel Łukasik
Keyword(s):  
Centrifugal Pump ◽  
Cavitation Erosion ◽  
Operating Parameters ◽  
Common Phenomenon ◽  
Cavitation Wear ◽  
Financial Losses ◽  
Selection Of

Cavitation is a common phenomenon in pump systems, negatively influencing their operating parameters and components such as impellers and, thus, causing considerable financial losses. This paper explains the problem of cavitation and cavitation erosion. The causes of cavitation in pump systems are analyzed. A selection of centrifugal pump impellers damaged by cavitation erosion are presented and examined. The authors also discuss ways of preventing cavitation and cavitation erosion in pump systems. Finally, relevant conclusions are drawn.

Numerically Controlled Machining of Propeller Blades

1989 ◽  
Vol 26 (03) ◽  
pp. 202-209
Author(s):  
Mark F. Nittel
Keyword(s):  
Operating Experience ◽  
Nc Machining ◽  
Machining Processes ◽  
The Past ◽  
Nc Programming ◽  
Machining Center ◽  
Blade Machining ◽  
Propeller Blades ◽  
Production Problems ◽  
Ship Propeller

This paper describes state-of-the-art manufacture of ship propeller blades with numerically controlled(NC) machining. A brief explanation of the rationale for NC machining is provided, followed by a discussion of the operating experience of a blade machining center over the past six years. Some of the unique considerations involved in the NC programming and machining processes are described along with some of the most common production problems. The factors leading to the company's decision to expand the blade machining center are discussed along with a description of the design and procurement of the new equipment and facilities. Tolerances achieved by NC machining and hand finishing are compared.

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