Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
IMPACT OF THE CHORD/DIAMETER DISTRIBUTION ON PROPELLERS EFFICIENCY USING THE LIFTING-LINE THEORY
Submission Author:
Felipe Leme , SP
Co-Authors:
Felipe Leme, Thiago Pontin Tancredi
Presenter: Felipe Leme
doi://10.26678/ABCM.COBEM2021.COB2021-1065
Abstract
Propellers are components widely used in vessel propulsion. Paradoxically, because of the high cost associated with physical experiments and the complexity of the phenomena to be modeled, the studies of these systems remain quite restricted. To reduce this gap, this work analyzes the influence of the c/D quotient along the blade on the hydrodynamic performance of a propeller. Prandtl's Lifting-line Theory implemented in the OpenProp code is used to the analyses. Initially, it is presented a validation procedure done with experimental data available in the literature. After the validation, two groups of geometries are proposed. The first, has a constant c/D distributions and the second, has c/D values decreasing in the region close to the blade tip. This work investigated Wageningen B-Series propellers with 3, 4 and 5 blades, with EAR values between 0.45 and 0.80. The results presented allow to conclude that, for any combinations analyzed, the lower is the c/D value, the higher is the efficiency obtained, reaching increments of 9%. When propellers with lower values of c/D at the blade’s tips are analyzed, the efficiencies obtained are even higher, reaching increments of 13%.
Keywords
propeller, Prandtl lifting-line theory, c/D, Blade, numerical model
