New WAGENINGEN CD propeller series


The open water characteristics for a large systematic series of Controllable Pitch Propellers (CPP) were recently measured at MARIN, including ducted propellers. Report outlines this extensive test programme.


A


round the world people involved in ship and propeller design have been working with the open


water thrust and torque characteristics of the WAGENINGEN B-series for fixed pitch propellers. However, increasingly today CPP are being used both in open configuration and in nozzles. Such CPP can operate over a wide range of speeds and they are installed on navy vessels, merchant ships, tugs and offshore supply vessels but also on offshore units with DP capabilities.


To support the design, selection and use of CPP and to enable the modelling of the thrust and torque characteristics of these propulsors in DP simulations for example, MARIN has developed a newly designed, systematic CPP and ducted CPP series. Thrust, torque and blade spindle torque in open water conditions are measured at model scale in all positive and negative inflow conditions. As each propeller with a specific design pitch can be operated over a range of operational pitch, an extensive test programme has to be conducted.


Henk van den Boom & Jie Dang


h.v.d.boom@marin.nl 22 report


Quasi-steady technique To enable an efficient measurement procedure, a new so-called quasi-steady open water test technique has been developed and verified. With this new method (ref. below) forward speed and rpm are varied over the meas- urement run and in this way the complete


open water characteristics in all quadrants are derived from a limited number of runs. MARIN’s numerical milling machine is used to build alloy models because lightweight propeller models are required when using this approach. To measure the blade spindle torque a dedicated test hub is used where one of the blades is fitted to a torque sensor.


The research work is carried out in a Joint Industry Project so that the actual series could be selected and designed following input from several leading propeller design- ers and manufacturers and the costs and results can be shared. So far, 22 companies are participating and this has led to the extension of the series to 31 propellers in 46 configurations, presented in the table below. The design pitch is given for each propeller in the table. Each propeller with a specific design pitch is then tested over the complete range of operational pitch settings.


C-4.40 P/D C-4.55 P/D C-4.70 P/D C-5.75 P/D


0.8, 1.0, 1.2, 1.4 0.8, 1.0, 1.2, 1.4 0.8, 1.0, 1.2, 1.4


1.0, 1.2, 1.4, 1.6


D-4.40 P/D 0.0, 0.8, 1.0, 1.2, 1.4 in duct 19A and 37 D-4.55 P/D 0.0, 0.8, 1.0, 1.2, 1.4 in duct 19A and 37 D-4.70 P/D 0.0, 0.8, 1.0, 1.2, 1.4 in duct 19A and 37


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