Experimental Static Cavitation Tunnel for Underwater Marine Propeller Cavitation Study

Flow field around a marine propeller was measured by means of PIV technique in a large cavitation tunnel of the Naval Systems Research Center, TRDI/Ministry of Defense, Japan. Test section of the tunnel is 2m(W) × 2m(H) × 10m(L) and it contains 2000m3 of water. 2-dimensional PIV (2-D PIV) and stereo PIV (SPIV) measurements were made for a five-bladed highly skewed marine propeller. In the case of 2-D PIV measurements, high spatial resolution measurements were possible by seeding relatively small amount of tracer particles. Phase-averaged flow fields showed details on evolution of tip vortices. In the case of SPIV measurements, much larger amounts of tracer particles were required, and it was difficult to perform high resolution measurements. Phase averaged velocity profiles from SPIV measurements showed good agreement with 2-D PIV-measured results. PIV-measured results were compared with results of LDV measurements. Although PIV-measured velocity profiles showed fairly good agreements with LDV-measured results, some discrepancies were found at the blade tip region.

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An experimental and numerical study of the vortices generated by hydrofoils

Polish Maritime Research ◽

10.2478/v10012-008-0027-3 ◽

2009 ◽

Vol 16 (3) ◽

pp. 11-17 ◽

Cited By ~ 4

Author(s):

J. Szantyr ◽

R. Biernacki ◽

P. Flaszyński ◽

P. Dymarski ◽

M. Kraskowski

Keyword(s):

Velocity Field ◽

Cross Sections ◽

Numerical Study ◽

Turbulence Models ◽

Marine Propeller ◽

Flow Conditions ◽

Tip Vortices ◽

Cavitation Tunnel ◽

Computer Codes ◽

Propeller Blades

An experimental and numerical study of the vortices generated by hydrofoils The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experimental part of the project consisted of the LDA measurements of the velocity field in three cross-sections of the vortex generated by the hydrofoils in the cavitation tunnel. The numerical part of the project consisted of calculations of the corresponding velocity field by means of three computer codes and several selected turbulence models. The comparative analysis of the experimental and numerical results, leading to the assessment of the accuracy of the numerical methods, is included.

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New Marine Propeller Cavitation Tunnel at The University of Tokyo, Its Design Concept and Special Features

Journal of the Society of Naval Architects of Japan ◽

10.2534/jjasnaoe1968.1981.150_148 ◽

1981 ◽

Vol 1981 (150) ◽

pp. 148-157 ◽

Cited By ~ 2

Author(s):

Hiroharu Kato ◽

Yayuki Watanabe ◽

Takashi Komura ◽

Masatsugu Maeda ◽

Masaru Miyanaga

Keyword(s):

Design Concept ◽

Marine Propeller ◽

Cavitation Tunnel ◽

The University

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Similarity Laws and Model Test Approaches to Determine Hydrodynamic Performance of a Marine Turbine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.665 ◽

2013 ◽

Vol 694-697 ◽

pp. 665-672

Author(s):

Wei Chao Shi ◽

Da Zheng Wang ◽

Mehmet Atlar ◽

Dan Wang

Keyword(s):

Model Test ◽

Rotation Speed ◽

Speed Control ◽

Torque Control ◽

Hydrodynamic Performance ◽

Marine Propeller ◽

Power Extraction ◽

Cavitation Tunnel ◽

Extraction Performance ◽

Similarity Laws

The paper presents the methodologies and approaches used in a Cavitation Tunnel or any other circulation channel to investigate the power extraction performance of a marine stream turbine. The paper first introduced model test similarity laws used in the Emerson Cavitation Tunnel (ECT) of Newcastle University to test a marine turbine in marine propeller cavitation tunnel; then based on these similarity laws to investigate the power extraction performance of a marine turbine in different approaches to control the rotation speed, namely: Torque Control and Rotation-speed control. A comparison was made by the tested experimental results. Torque Control is referred to the speed control strategy of using a generator to absorb the torque building up from the stream, on the other hand Rotation-speed control is to use motor to control rotation speed of the turbine. It indicates that both methods can be employed to investigate the hydro performance of marine stream turbine, with wider range of TSR can Rotation-speed Control test.

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