Abstract
A full understanding of the hydrodynamic processes within the jet produced by a manoeuvring ship’s propeller is essential in the development and maintenance of ports, docks and harbours. In this study the predominant axial velocity component of a diffusing propeller jet was studied. The flow fields formed by four propellers, each operating at four power levels (speeds of rotation), were investigated under bollard pull conditions within a large free surface tank using Laser Doppler Anemometry. Comparison were made to existing methodologies by which a prediction of the magnitudes of the axial velocity can be made, and where deficient modifications to the methodologies have been developed. The jets were found to produce a maximum axial velocity along the initial efflux plane at a location near the blade mid-span. The position and magnitude of the axial velocity was seen to decrease as the jet entrained more flow and transitioned from the zone of flow establishment into the zone of established flow.
| Original language | English |
|---|---|
| Pages (from-to) | 104-112 |
| Journal | Ocean Engineering |
| Volume | 124 |
| Early online date | 02 Aug 2016 |
| DOIs | |
| Publication status | Published - 15 Sep 2016 |
Keywords
- Propeller Jets, Scour, Ports, Dock and Harbours, Hydraulics & Hydrodynamics
Access to Document
- Predicting axial velocity profiles within a diffusing marine propeller jet
Copyright 2016 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.
