New Tripping JIP for scale corrections for propellers using boundary layer tripping

Full scale performance of propellers is still an area of large uncertainty during the propeller design phase, during the extrapolation of model tests for powering predictions and during full scale monitoring. On full scale, propellers usually operate with turbulent flow. On model scale, however, laminar flow, flow transition and more pronounced flow separation are encountered. Model tests and powering predictions suffer from these effects.

The aim of the new Tripping Joint Industry Project is therefore to develop new propeller scale corrections to predict full-scale open water performance and propulsive performance more accurately. In the Tripping JIP, turbulators will be applied on a large set of model-scale propellers to trip towards a turbulent flow, resembling the full scale situation more accurate. The Wageningen B-series will be revisited, amongst propellers of the newer Wageningen C- and F-series. The Reynolds scale effects for a fully turbulent flow will be assessed by means of RANS computations.

The Tripping JIP will provide new scale corrections (to replace the old ITTC corrections), correlation allowances for RANS computations and a full-scale polynomial for the Wageningen B-series.