Detailed analysis of the wake of a DP thruster emphasizing comparison between LDV and SPIV techniques

• Published in: Journal of Offshore Mechanics and Arctic Engineering
• Main Authors: El Lababidy, S., Bose, N., Liu, P., Di Felice, F.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2006
• Subjects: Nozzle; Arctic
• Online Access: https://doi.org/10.1115/1.2185680; https://nrc-publications.canada.ca/eng/view/object/?id=8f472750-4d8b-4747-9bf9-9609f203c460; https://nrc-publications.canada.ca/fra/voir/objet/?id=8f472750-4d8b-4747-9bf9-9609f203c460

To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the bollard pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper. Peer reviewed: Yes NRC publication: Yes