摘要
将焓法模型稍做变换后,用于求解温差能驱动水下滑翔机动力装置的相变过程,将温度场与液相分数场解耦,液相分数值由温度场确定.引入有效热导率来表示液相对流对相变过程的影响,计算结果与实验值吻合.对几种不同性质的材料进行了数值模拟分析,分别计算了比相变温度高5℃和10℃温差下,量纲一的量相界面的移动规律、液相分数随时间的变化情况,以及相变材料储能速率.结果表明,外界环境温度在5～30℃范围内,十六号凝胶性能优于其他材料.此外,以十六号凝胶为贮能材料,研究了对流换热系数、储能容器半径对相变过程的影响.
Modified enthalpy method was used to solve melting process of underwater glider propelled by ocean thermal energy.Temperature field and liquid fraction field was decoupled.Liquid fraction field updated using the currently known temperature field.Effective conductivity was used to consider the effect of natural convection of the melting phase,simulation results is more consistent to the experiment.Several phase change materials were analyzed while the surrounding temperature was 5 or 10 degree over the melting temperature.Non-dimensional interface moving rate,liquid fraction varying with time and energy storing rate were attained.No.16 Gel is more suitable as the phase change material when the surrounding temperature is between 5 to 30 degrees.Then,the effect of different radius,convections coefficients on the total melting time of No.16 Gel was analyzed.
出处
《武汉理工大学学报（交通科学与工程版）》
2011年第2期223-227,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金项目资助(批准号:50979058)
关键词
水下滑翔机
海洋温差能
相变
焓法模型
underwater glider
ocean thermal energy
phase change
enthalpy method
