Comparison of extrapolation procedures for submarine towing test data

Object and purpose of research. This paper discusses towing test data extrapolation for submarines (in submerged conditions) as per two different procedures to compare the results. Subject matter and methods. The study relied on model test data for submarines and submersibles available with Krylov State Research Centre Deepwater Test Tank and performed as per Procedure [1], and on towing test data extrapolation results obtained as per References [2, 4]. Test results are extrapolated to the full-scale as per two procedures, with subsequent comparison of towing resistance values for model hull. Main results. The paper demonstrates that the deviation between the two procedures is insignificant and commensurable with acceptable measurement error, with discussion on possible reasons for this deviation. Conclusion. Despite minor deviations in towing test procedures described in [1, 4], full-scale extrapolations obtained as per References [2, 4] coincide, which indirectly confirms reliability of the results and correctness of the assumptions.