Three-dimension efflux velocity characteristics of marine propeller jets
| Autor: | Donal Ryan, Charmaine Kee, Gerard Hamill |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Engineering
Jet (fluid) animal structures business.industry Propeller Blade geometry Magnitude (mathematics) Ocean Engineering Mechanics Laser Doppler velocimetry Quantitative Biology::Cell Behavior Quantitative Biology::Subcellular Processes Dimension (vector space) Range (statistics) Current (fluid) business Marine engineering |
| Zdroj: | Proceedings of the Institution of Civil Engineers - Maritime Engineering. 168:62-75 |
| ISSN: | 1751-7737 1741-7597 |
| DOI: | 10.1680/jmaen.14.00019 |
| Popis: | Determining the efflux velocity in a ship's propeller jet is the key to calculating the velocity at any other location within the diffusing jet. Current semi-empirical equations used to calculate the magnitude of the efflux velocity have been based on studies that employed a limited range of propeller characteristics. This paper reports on the findings of an experimental investigation into the magnitude of the efflux velocities of the jets produced by four different propellers, where the characteristic of the blade geometry has been chosen to extend the range of applicability of the outcomes. Measurements of velocity have been made using a three-dimensional laser Doppler anemometry system, with the test propellers operating at a range of rotational speeds that bound typical operational values. Comparisons are made with current predictive theories and, to aid engineers in the design of marine infrastructure, methods are presented by which the three-dimensional efflux velocity components, as well as the resultant efflux value, can be more accurately determined. |
| Databáze: | OpenAIRE |
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