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Numerical investigation on the flow characteristics and hydrodynamic performance of tandem propeller
Highlights Hydrodynamic performance of tandem propeller is investigated and the effects of the spacing ratio and the diameter ratio are analyzed. Efficiency is improved by approximately 45% for the tandem propeller with the diameter ratio being 0.95 at L/D = 0.29 compared to single propeller, at J = 0.7. Three flow regimes are identified in the wake flow and the velocity maximizes at approximately r = 0.7R.
Abstract The hydrodynamic performance of tandem propeller (two co-rotating KP458 propellers) is investigated by an FVM (Finite Volume Method) based approach in this study. The effects of advance ratio J (0 ≤ J ≤ 0.7), spacing ratio (0.26 ≤ L/D f ≤ 0.34) and diameter ratio (0.92 ≤ D a/D f ≤ 0.97) are comprehensively studied and analyzed. A three-dimensional cubic computational domain is considered in this study, and the MRF (Moving Reference Frame) approach is adopted to handle the rotation of the tandem propeller mathematically. Turbulence is accounted for with the RNG k-ε model. It is demonstrated that the hydrodynamic forces maximize at a spacing ratio of 0.29 if the diameter ratio equals 1.0. It is also found that the efficiency is improved by approximately 45% for the tandem propeller with the diameter ratio being 0.95 at L/D f = 0.29, compared to the single propeller, at J = 0.7. In addition, by appropriately specifying the spacing ratio or the diameter ratio, the rotation of rear propeller could well absorb the energy of the trailing vortices shed from the front propeller. Consequently, the trailing vortices are rapidly dissipated and disappear in the wake field after merging, and a better hydrodynamic performance can be obtained.
Numerical investigation on the flow characteristics and hydrodynamic performance of tandem propeller
Highlights Hydrodynamic performance of tandem propeller is investigated and the effects of the spacing ratio and the diameter ratio are analyzed. Efficiency is improved by approximately 45% for the tandem propeller with the diameter ratio being 0.95 at L/D = 0.29 compared to single propeller, at J = 0.7. Three flow regimes are identified in the wake flow and the velocity maximizes at approximately r = 0.7R.
Abstract The hydrodynamic performance of tandem propeller (two co-rotating KP458 propellers) is investigated by an FVM (Finite Volume Method) based approach in this study. The effects of advance ratio J (0 ≤ J ≤ 0.7), spacing ratio (0.26 ≤ L/D f ≤ 0.34) and diameter ratio (0.92 ≤ D a/D f ≤ 0.97) are comprehensively studied and analyzed. A three-dimensional cubic computational domain is considered in this study, and the MRF (Moving Reference Frame) approach is adopted to handle the rotation of the tandem propeller mathematically. Turbulence is accounted for with the RNG k-ε model. It is demonstrated that the hydrodynamic forces maximize at a spacing ratio of 0.29 if the diameter ratio equals 1.0. It is also found that the efficiency is improved by approximately 45% for the tandem propeller with the diameter ratio being 0.95 at L/D f = 0.29, compared to the single propeller, at J = 0.7. In addition, by appropriately specifying the spacing ratio or the diameter ratio, the rotation of rear propeller could well absorb the energy of the trailing vortices shed from the front propeller. Consequently, the trailing vortices are rapidly dissipated and disappear in the wake field after merging, and a better hydrodynamic performance can be obtained.
Numerical investigation on the flow characteristics and hydrodynamic performance of tandem propeller
Liu, Yang (author) / Gong, Qingwei (author)
Applied Ocean Research ; 101
2020-07-13
Article (Journal)
Electronic Resource
English
Application of Dynamic Mesh in Analysis of Propeller Hydrodynamic Characteristics
| British Library Conference Proceedings | 2012