Curved fibre path optimisation for improved shape adaptive composite propeller blade design

2021 ◽  
Vol 255 ◽  
pp. 112961
Author(s):  
Phyo Thu Maung ◽  
B. Gangadhara Prusty ◽  
Andrew W. Phillips ◽  
Nigel A. St John
Keyword(s):  
Blade Design ◽  
Propeller Blade ◽  
Adaptive Composite

A Design Procedure for Large-Hub Propellers

1972 ◽  
Vol 16 (03) ◽  
pp. 167-173
Author(s):  
James Bruce Andrews ◽  
Damon E. Cummings
Keyword(s):  
Design Procedure ◽  
Blade Design ◽  
Propeller Blade ◽  
Lifting Surface ◽  
Line Sink ◽  
Circulation Distribution ◽  
Lifting Line

A procedure is given for the design of propellers with large hubs. The hub is modelled by a line sink. A lifting-line propeller model with no hub far downstream is used for thrust, torque, and efficiency calculations. The circulation distribution from this wake propeller is moved up the hub streamlines to the propeller plane for the actual lifting-surface propeller blade design.

THEORETICAL METHOD OF THE OPTIMUM DESIGN OF A SUPERCAVITATING PROPELLER BLADE WITH SPOILER MOUNTED ON THE TRAILING EDGE

2021 ◽  
Vol 152 (A1) ◽  
Author(s):  
Zaw Win ◽  
G M Fridman ◽  
A S Achkinadze
Keyword(s):  
Design Method ◽  
Theoretical Method ◽  
Blade Design ◽  
Propeller Blade ◽  
Trailing Edge ◽  
Theoretical Design ◽  
Closure Scheme ◽  
Blade Section ◽  
Cavity Closure ◽  
Cfd Method

This paper presents theoretical design method to obtain 2-D optimum section with spoiler mounted on the trailing edge of a supercavitating propeller blade. Matched Asymptotic Expansions (MAE) is applied to determine the geometry of profile and cavity shape in the framework of potential flow theory. The blade section is of wedge-like shape and the opened cavity closure scheme is adopted. A typical section, on which the optimum blade design will be based, is singled out among the best individual sections from root to tip. The spoiler length of each hydrofoil section resulting from MAE method are finalized with CFD method so as to consider viscous effect under the same lift condition, others hydrofoil geometries being kept constant. The hydrodynamic performances of all blade sections being designed on the basis of the resulting typical section from linearized method are finally predicted with CFD method.

scholarly journals Experimental Verification of the Elastic Response in a Numeric Model of a Composite Propeller Blade with Bend Twist Deformation

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3766
Author(s):  
Sondre Østli Rokvam ◽  
Nils Petter Vedvik ◽  
Lukas Mark ◽  
Eivind Rømcke ◽  
Jon Schawlann Ølnes ◽  
...  
Keyword(s):  
Finite Element ◽  
Twist Angle ◽  
Point Load ◽  
Image Correlation ◽  
Elastic Response ◽  
Propeller Blade ◽  
Element Analysis ◽  
Numeric Model ◽  
Load Variable ◽  
Adaptive Composite

Adaptive composite propeller blades showing bend twist behaviour have received increasing interest from hydrodynamic and structural engineers. When exposed to periodic loading conditions, such propellers can be designed to have higher energy efficiency and emit less noise and vibration than conventional propellers. This work describes a method to produce an adaptive composite propeller blade and how a point load experiment can verify the predicted elastic response in the blade. A 600 mm-long hollow full-size blade was built and statically tested in the laboratory. Finite element modelling predicted a pitch angle change under operational load variable loads of 0.55°, a geometric change that notably compensates for the load cases. In the laboratory experiment, the blade was loaded at two points with increasing magnitude. The elastic response was measured with digital image correlation and strain gauges. Model predictions and experimental measurements showed the same deformation patterns, and the twist angle agreed within 0.01 degrees, demonstrating that such propellers can be successfully built and modelled by finite element analysis.

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