Abstract
A free running test using a container ship model clarified properties of effective inflow velocity to propellers in waves. The analysis assumes that thrust and torque vary keeping their relation to the effective inflow velocity as represented by open-water characteristics of a propeller in a steady calm water condition. Measurement in regular waves confirmed the variation of average values of the effective wake coefficient and ship speed depending on wavelength and wave encounter angle. Comparison with the longitudinal flow velocity measured at the sides of the propeller using an onboard vane-wheel current meters confirmed that one can estimate the effective inflow velocity based on thrust or torque data. Theoretical estimates in regular waves based on a strip method are provided and compared with the experimental data. A prediction model of the future inflow velocity is proposed to cope with a time delay of a propeller pitch controller for higher propeller efficiency in waves.
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Acknowledgments
The authors thank Mr. Yasushi Kitagawa at the National Maritime Research Institute for his providing the information about a propeller pitch controller of a cargo carrier. This study was supported by the Program for Promoting Fundamental Transport Technology Research from the Japan Railway Construction, Transport and Technology Agency (JRTT).
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Appendix
Appendix
Reference test data including ship motion in regular and irregular waves are shown in Figs. 13 and 14.
Time history of longitudinal component of ship speed, U(ship); effective inflow velocity obtained using thrust data, u P[T]; flow velocity measured by vane-wheel current meter at starboard, u(stb) in regular head waves (χ, wave encounter angle; Hwm, measured wave height; n, propeller revolution)
Time history of pitch angle (bow-up positive), heave acceleration at center of gravity (downward positive), and relative waves at aft perpendicular (upward positive) in irregular waves, corresponding Fig. 5; (χ, wave encounter angle; T 01, primary wave period; H 1/3, designated significant wave height; n, propeller revolution)
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Ueno, M., Tsukada, Y. & Tanizawa, K. Estimation and prediction of effective inflow velocity to propeller in waves. J Mar Sci Technol 18, 339–348 (2013). https://doi.org/10.1007/s00773-013-0211-8
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DOI: https://doi.org/10.1007/s00773-013-0211-8