### Abstract

Original language | English |
---|---|

Pages (from-to) | 14-24 |

Number of pages | 11 |

Journal | Applied Ocean Research |

Volume | 35 |

Issue number | null |

DOIs | |

Publication status | Published - Mar 2012 |

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### Cite this

*Applied Ocean Research*,

*35*(null), 14-24. https://doi.org/10.1016/j.apor.2012.01.002

}

*Applied Ocean Research*, vol. 35, no. null, pp. 14-24. https://doi.org/10.1016/j.apor.2012.01.002

**Semi-empirical methods for determining the efflux velocity from a ship's propeller.** / Lam, W.; Hamill, Gerard A.; Robinson, Desmond J.; Raghunathan, S.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Semi-empirical methods for determining the efflux velocity from a ship's propeller

AU - Lam, W.

AU - Hamill, Gerard A.

AU - Robinson, Desmond J.

AU - Raghunathan, S.

PY - 2012/3

Y1 - 2012/3

N2 - The present study proposed the semi-empirical methods for determining the efflux velocity from a ship's propeller. Ryan [1] defined the efflux velocity as the maximum velocity taken from a time-averaged velocity distribution along the initial propeller plane. The Laser Doppler Anemometry (LDA) and Computational Fluid Dynamics (CFD) were used to acquire the efflux velocity from the two propellers with different geometrical characteristics. The LDA and CFD results were compared in order to investigate the equation derived from the axial momentum theory. The study confirmed the validation of the axial momentum theory and its linear relationship between the efflux velocity and the multiplication of the rotational speed, propeller diameter and the square root of thrust coefficient. The linear relationship of these two terms is connected by an efflux coefficient and the value of this efflux coefficient reduced when the blade number increased.

AB - The present study proposed the semi-empirical methods for determining the efflux velocity from a ship's propeller. Ryan [1] defined the efflux velocity as the maximum velocity taken from a time-averaged velocity distribution along the initial propeller plane. The Laser Doppler Anemometry (LDA) and Computational Fluid Dynamics (CFD) were used to acquire the efflux velocity from the two propellers with different geometrical characteristics. The LDA and CFD results were compared in order to investigate the equation derived from the axial momentum theory. The study confirmed the validation of the axial momentum theory and its linear relationship between the efflux velocity and the multiplication of the rotational speed, propeller diameter and the square root of thrust coefficient. The linear relationship of these two terms is connected by an efflux coefficient and the value of this efflux coefficient reduced when the blade number increased.

U2 - 10.1016/j.apor.2012.01.002

DO - 10.1016/j.apor.2012.01.002

M3 - Article

VL - 35

SP - 14

EP - 24

JO - Applied Ocean Research

JF - Applied Ocean Research

SN - 0141-1187

IS - null

ER -