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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 57952 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Abbaspour, Majid
- Abstract:
- This study presents a hydrodynamic and performance analysis of a small research submarine, aiming to optimize its design, enhance efficiency, and ensure safety under operational and emergency conditions. Given the increasing importance of underwater exploration and research, various submarine models were initially evaluated in terms of design and performance. The Myring subsurface model was selected as the optimal design due to its favorable fullness ratio and the ability to approximate the hull shape to a spherical geometry. The submarine's dimensions were specified as 3 meters in length and 2 meters in diameter, suitable for small-scale research missions at moderate depths. To investigate the submarine's hydrodynamic behavior, the placement of fins and rudders was optimized. This process was conducted using numerical simulations in STAR-CCM software, employing computational fluid dynamics (CFD) methods. The simulation results demonstrated that precise positioning of fins and rudders could reduce hydrodynamic resistance. Additionally, the maximum speed of the submarine was calculated and optimized based on these analyses. In another part of the study, the design and performance analysis of the propeller, a critical component in providing thrust, were carried out. A propeller from the B-series was chosen due to the availability of 120 open water diagrams, making it a suitable option. The optimal installation position and diameter of the propeller were determined through numerical analysesOne of the most significant aspects of this research was the investigation and simulation of the emergency ascent mechanism for the submarine. This mechanism was designed to enable rapid and safe surfacing in critical situations by releasing ballast weights located at the lower part of the hull. To achieve optimal performance, the weight, placement, and release timing of the ballast were examined and optimized according to the submarine's depth. Simulations conducted in STAR-CCM software showed that the ballast should be designed and positioned to generate an upward force opposing gravity while maintaining the submarine's stability and passenger comfort. For validation purposes, the simulation results were compared with data from a related study that modeled emergency ascent through the rapid release of ballast tanks. The comparison indicated a deviation of less than 5%, confirming the accuracy of the simulations. Given the limited scientific resources and research on emergency ascent mechanisms through ballast weight release, the optimization process including determining the weights, placement, and precise timing of release was carried out using a trial-and-error approach. The findings of this study demonstrate that the proposed mechanism can ensure safe, rapid, and stable emergency ascent from depths ranging from 10 to 50 meters. This research introduces an innovative method for designing emergency ascent mechanisms for small submarines and can serve as a foundation for future studies aimed at optimizing submarine performance and safety under operational and emergency conditions
- Keywords:
- Hydrodynamic Analysis ; Optimization ; Computational Fluid Dynamics (CFD) ; Impeller Design ; Small Research Submarine ; STAR-CCM Software ; Emergency Ascent Mechanism
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