Steady velocity measurements in the stern wake of submarine hull form at high angles of incidence

Abstract

Velocity distribution in the stern region over a generic submarine hull form (SUBOFF) at high angles of incidence was investigated through steady velocity measurements in the Wind Tunnel Facility at Naval Science & Technological Laboratory, India. Velocity measurements were performed for a range of angles of incidence in angle of attack (+8° to - 40°) and drift (0°–28°) on 1.372 m model at Reynolds number 1.7 × 106. The present study for high angles of incidence is to depict a submarine motion during extreme manoeuvers in case of emergency situations. The particulars of the SUBOFF model, experimental facility and measurement technique, test results for axial, tangential and radial velocity measurements, non-uniformity and circumferential mean velocity, derived quantities for vorticity and circulation are highlighted in the paper. The velocity measurements data generated from the above studies will greatly complement the current research on turbulent flows over submerged bodies both computationally and experimentally.