Experimental study on hydrodynamic coefficients for high-incidence-angle maneuver of a submarine

TLDR

Snap rolling during hard turns and instability during emergency rises are key submarine operational concerns. The study aims to develop a quasi‑steady dynamics model for high‑incidence‑angle submarine maneuvers to predict snap rolling and emergency‑rise instability. The authors determined hydrodynamic coefficients by conducting static, dynamic, and control‑surface tests in a towing tank (Re = 3.12 × 10⁶) and wind tunnel (Re = 5.11 × 10⁶), then applied least‑squares, golden‑section search, and polynomial surface fitting to analyze the data. The resulting coefficients, presented in tables, enable hard‑turning simulation, emergency‑rise simulation, and controller design.

Abstract

Snap rolling during hard turning and instability during emergency rising are important features of submarine operation. Hydrodynamics modeling using a high incidence flow angle is required to predict these phenomena. In the present study, a quasi-steady dynamics model of a submarine suitable for high-incidence-angle maneuvering applications is developed. To determine the hydrodynamic coefficients of the model, static tests, dynamic tests, and control surface tests were conducted in a towing tank and wind tunnel. The towing tank test is conducted utilizing a Reynolds number of 3.12 × 106, and the wind tunnel test is performed utilizing a Reynolds number of 5.11 × 106. In addition, least squares, golden section search, and surface fitting using polynomial models were used to analyze the experimental results. The obtained coefficients are presented in tabular form and can be used for various purposes such as hard turning simulation, emergency rising simulation, and controller design.