| Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy |
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| 引用本文： | KONG Qiao-ling MA Jie. Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy[J]. 船舶与海洋工程学报, 2007, 6(4): 37-43. DOI: 10.1007/s11804-007-7034-0 |
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| 作者姓名： | KONG Qiao-ling MA Jie |
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| 作者单位： | State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200030, China |
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| 基金项目： | Foundation item： Supported by the Sustainable Energy Propulsion System Program of 211＇s Engineering Foundation Shanghai Jiaotong University.Acknowledgement The author would like to thank Pro. MA Jie for his support and valuable guidance. The RR.C 211 progrmn of ship and ocean construction in Shanghai Jiaotong University is greatly acknowledged for financing support. |
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| 摘 要： | The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.
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| 关 键 词： | 相变 热传输分析 海洋温差能 水下驱动能力 |
| 文章编号： | 1671-9433（2007）04-0037-07 |
| 收稿时间： | 2007-05-17 |
Phase change analysis of an underwater glider propelled by the ocean’s thermal energy |
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| Qiao-ling Kong,Jie Ma. Phase change analysis of an underwater glider propelled by the ocean’s thermal energy[J]. Journal of Marine Science and Application, 2007, 6(4): 37-43. DOI: 10.1007/s11804-007-7034-0 |
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| Authors: | Qiao-ling Kong Jie Ma |
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| Affiliation: | (1) State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai, 200030, China |
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| Abstract: | The phase change characteristic of the power source of an underwater glider propelled by the ocean's thermal energy is the key factor in glider attitude control.A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions.Phase change is not an isothermal process, but one that occurs at a range of temperature.The total melting time of the material is very sensitive to the surrounding temperature.When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times.But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same.However, the temperature at which phase change is completed decreases significantly.Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source's cross sectional area.Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time.Our conclusions should be helpful in effective design of underwater glider power systems. |
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| Keywords: | phase change heat transfer analysis ocean thermal energy underwater glider |
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