This page contains a Flash digital edition of a book.
Putting a new spin on propeller design

With regard to propeller design MARIN focuses on the best possible compromise between the propulsive efficiency and cavitation nuisance, and how further improvements can be made. Evert-Jan Foeth, John Huisman & Arjan Lampe,

research and cruise ships with delayed cavitation inception, high performance propellers for merchant ships, or propellers for special purpose vessels such as dredgers, tugs and fishing vessels.


Currently, we are redesigning our propeller design process. For example, we used to set the diameter applying best-practice guidelines for propeller-hull clearance. Now we specify the maximum force allowed on the hull and ask ourselves: what is the best propeller design within those limits? By setting important propeller parameters at the end of the design process, and not at the beginning, we can obtain a better design. The latest design techniques are used, such as multi-objective optimisation techniques that can: • Thoroughly explore the many design opportunities within the design space

• Analyse the propeller in all the relevant conditions simultaneously

• Visualise trade-offs between conflicting objectives

Figure 1: Example of an optimisation case with the Pareto front in red. The margin against cavitation inception and efficiency are maximised. CPN is the pressure coefficient and σ И the cavitation number.

24 report

• Quantify the influence of design choices, constraints and limitations on the objectives

his applies to a wide range of designs such as high-end, ‘low- noise’ propellers for yachts, naval,

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28