Experimental investigation of result extrapolation accuracy of CRP propeller open water(POW) test at different advance ratio

Until now, various calculation methods have been used to analyze CRP propellers that are used in submarines and some ships. Open water and self-propulsion tests are the most common tests in the evaluation of propellers. In this research, one of the common methods of results extrapolation of the propeller test in open water (POW) has been tried to evaluate scientifically based on experimental data, and its accuracy in results generalizing from the model to the base sample in different advance ratio has been determined. The experimental data includes the test results of the POW model of a CRP propeller in the superimposition mode of the effect of the propellers and also the model test results for each single propeller of this CRP system. The way of checking the accuracy and efficiency of the method studied in this article is that with the raw data of the model test, the increase in the Kt and Kq coefficients of the CRP propeller compared to the single propellers of the model was determined. Then, with the help of the result extrapolation code, by extracting the coefficients of Kt and Kq for base sample propellers, the increase of Kt and Kq coefficients of the CRP propeller compared to single propeller was evaluated. By comparing the amount of these increases in the model and the base sample, it is possible to estimate result extrapolation accuracy of CRP propeller open water test at different advance ratio.