Abstract
This paper describes a methodology to design and optimize a controllable pitch propeller suitable for small leisure ship boats. A proper range for design parameters has to be set by the user. An optimization based on the Particle Swarm Optimization algorithm is carried out to minimize a fitness function representing the engine’s fuel consumption. The OpenProp code has been integrated in the procedure to compute thrust and torque. Blade’s geometry and tables about pitch, thrust and consumption are the main output of the optimization process. A case study has been included to show how the procedure can be implemented in the design process. A case study shows that the procedure allows a designer to sketch a controllable pitch propeller with optimal efficiency; computational times are compatible with the design conceptual phase where several scenarios must be investigated to set the most suitable for the following detailed design. A drawback of this approach is given by the need for a quite skilled user in charge of defining the allowable ranges for design parameters, and the need for data about the engine and boat to be designed.
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Notes
Form 2 by Formlabs (https://formlabs.com/3d-printers/form-2/).
Abbreviations
- \(A_\mathrm{E}/A_\mathrm{O}\) :
-
Blade area ratio
- \(\beta _i\) :
-
Initial stagger angle (\(\circ\))
- \(\beta _2\) :
-
Stagger angle for intermediate velocity (\(\circ\))
- \(\beta _1\) :
-
Stagger angle for lowest advance velocity (\(\circ\))
- c/D :
-
Chord distribution along blade
- D :
-
Diameter (m)
- \(D_\mathrm{hub}\) :
-
Hub diameter (m)
- \(D_\mathrm{opt}\) :
-
Optimum propeller diameter (m)
- \(\eta\) :
-
Propeller efficiency
- \(\mathrm{FC}\) :
-
Fuel consumption (kg / h)
- f/c :
-
Camber distribution along blade
- \(\Gamma\) :
-
Vortex circulation
- J :
-
Advance ratio
- \(K_\mathrm{T}, K_\mathrm{Q}\) :
-
Thrust and torque propeller coefficients
- \(k_{\mathrm{cav}}\) :
-
Cavitation penalization coefficient
- \(k_{\mathrm{stress}}\) :
-
Maximum stress penalization coefficient
- \(k_{\mathrm{thrust}}\) :
-
Generated thrust penalization coefficient
- n :
-
Rotational speed (1 / s)
- P/D :
-
Pitch distribution along blade
- \(P_\mathrm{T}\) :
-
Thrust power (W)
- \(P_\mathrm{D}\) :
-
Delivered power (W)
- Q :
-
Torque (N m)
- RPM:
-
Rotational speed ( 1 / min)
- \(\rho\) :
-
Water density (kg / m\(^3\))
- \(\sigma _{N}\) :
-
Cavitation number
- t :
-
Deduction factor
- T :
-
Generated thrust (N)
- \(T_{\mathrm{des}}\) :
-
Desired thrust (N)
- \(\%_{\mathrm{th}}\) :
-
Throttle percentage
- \(V_\mathrm{a}\) :
-
Volumetric mean inflow velocity (m / s )
- \(V_\mathrm{s}\) :
-
Advance ship speed ( m / s)
- Z :
-
Blade number
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Bacciaglia, A., Ceruti, A. & Liverani, A. Controllable pitch propeller optimization through meta-heuristic algorithm. Engineering with Computers 37, 2257–2271 (2021). https://doi.org/10.1007/s00366-020-00938-8
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DOI: https://doi.org/10.1007/s00366-020-00938-8