New McdSeries tool: design CP propellers using the WAGENINGEN CD Series

Within the scope of the CD Propeller JIP, a modern, systematic series of controllable pitch propellers (CPP) was developed and tested in open water. The ‘McdSeries’ software tool allows you to design CPP on the basis of these results.

In the CD Propeller JIP, MARIN has developed the WAGENINGEN CD Series of CPP (4 and 5 bladed) and ducted CPP (4 bladed in duct 19A and 37). Thrust, torque and blade spindle torque in open water conditions were measured at model scale in all the positive and negative inflow conditions. As each propeller with a specific design pitch can be operated over a wide operational pitch range, an extensive test programme was carried out. The results of these tests are represented by a database of polynomials and Fourier series for each combination of propeller type, blade area ratio, design pitch and pitch setting.

Martin van Hees

One of the results of the CD Propeller JIP is the McdSeries design tool, which is now available at MARIN. The McdSeries enables you to select and

analyse a CPP for your project within the confines of the WAGENINGEN CD Series.

McdSeries comprises a workflow for design, performance evaluation and geometry creation. Design propeller can be performed on the basis of 18 different combinations of input, e.g. on the basis of given thrust and speed, power and speed, resistance and speed, design bollard pull, etc. In Evaluate performance, open water curves and two quadrant curves can be created for varying pitch angles. In Performance prediction performance data can be prepared on the basis of either a speed-thrust relationship or a speed-effective power-thrust deduction relationship. In Engine revs/pitch variation a matrix of speed, power, thrust and torque is computed. In Engine revs/ship speed variation a matrix of pitch settings, thrust, torque and power is computed. Both sets of data can be used as input to create combinator curves. In Create geometry a spreadsheet is generated with the radial distribution of pitch, chord length, camber and the section profile coordinates. The innovative McdSeries tool provides all the input necessary for a detailed propeller design.

Screen shot of McdSeries tool, open water curve of selected CPP design

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