Experimental investigation of free-surface effects on flow characteristics of a torpedo-like geometry having a cambered nose

Sarigiguzel, F.; Kilavuz, A.; Özgören, Muammer; Durhasan, Tahir; Şahi̇n, Beşi̇r; Kavurmacıoğlu, Levent; Akıllı, Hüseyin; Sekeroglu, E.; Yanıktepe, Bülent

doi:10.1016/j.oceaneng.2022.111174

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…Based on hydrodynamics, the teardrop or nearly cylindrical pressure shells made up of a series of cylindrical shells and end spherical conical shells remain the most effective design for modern submarines [17][18][19][20][21]. This design can significantly reduce seawater resistance at high speeds [22], increase sailing speeds [23], and lower energy consumption [24,25].…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Sun,

Zhang,

Zhang

et al. 2024

JMSE

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The main load-bearing structure of submarines is the pressure shell. Shell failures are usually caused by high hydrostatic pressure and its own potential geometric imperfections. This paper proposes a cylindrical shell with a strong corrugated stiffening structure. Two theoretically geometrically identical shells are fabricated using CNC machining to ensure the reproducibility and reasonableness of the results. Firstly, the point cloud data of all the geometric parameters of the corrugated pressure cylindrical shells were obtained using a 3D scanner. Geomagic Control X 3D inspection software was used to determine the geometric deviations of the shells. Geometric reconstruction was performed using Geomagic Design X reverse modeling software to capture potential imperfections of the shells. The aluminum shells were then welded and placed in the pressure chamber. Failure loads were obtained for all shells by constant water injection and pressurization. Considering the confined nature of the pressure chamber, a nonlinear finite element analysis of the corrugated pressure cylindrical shell was carried out using Abaqus/Riks, taking into account actual fabrication imperfections. Finally, the failure behavior of the shells under uniform external pressure was determined. The results show that both corrugated pressure cylindrical shells have high machining accuracy. The numerical simulation results of the critical buckling load of the corrugated pressure cylindrical shells were in good agreement with the test results. The corrugated structure has additional advantages in retarding the generation and expansion of shell surface defects. The equilibrium path of the corrugated pressure cylindrical shell can be maintained in a smooth and continuous state, showing stable buckling behavior. This study will provide new inspiration for the structural design and failure prediction of the submarine pressure shell.

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