| 摘要: |
| 针对浮式消波海流机样机测试时出现的问题，对其吃水深度线和叶片安装角度进行优化。根据装置结构特点，用Gambit建立了装置横截面的二维网格模型。根据浮式消波海流机实际工作环境，利用Fluent流体仿真软件，使用VOF（volume of fluid）两相流模型，分配空气相与液态水相在流域中的不同比例，来确定不同的吃水深度线。并且结合k-epsilon紊流模型建立模拟仿真环境。先对3种水线进行仿真分析，然后进行实验验证。通过分析对比装置的3种不同吃水深度线的模拟与实验结果，得到装置的最优吃水深度线为1/3水线。基于最优吃水深度线，分别对叶片的4种安装角度在相同的仿真环境中进行模拟仿真。利用仿真得到的扭矩数据，计算扭矩系数、功率系数，分析对比仿真数据以及仿真过程中扭矩趋势图得出4种叶片安装角度的最优角度是90°。吃水深度线决定了装置的消波能力，并且为叶片获能提供条件，叶片安装角度直接影响着装置的获能效率，所以最优的吃水深度线和叶片安装角度对海流机的消波能力和获能效率具有重要意义。 |
| 关键词: 浮式消波海流机 网格模型 VOF(volume of fluid)模型 仿真环境 吃水深度线 安装角度 |
| DOI：10.11759/hykx20190326002 |
| 分类号:V448.15+3 |
| 基金项目:国家自然科学基金项目（41976194） |
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| Performance optimization of a floating wave-eliminating current machine based on the VOF model |
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WANG Shi-ming, WANG Jia-zhi, TIAN Ka, JIA Qiao-jiao
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College of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201306, China
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| Abstract: |
| On the basis of the problems that occurred during testing of the floating wave-eliminating current machine prototype, the draft depth line and blade installation angle are optimized. Then, on the basis of the structural characteristics of the device, the two-dimensional mesh model of the cross section of the device is established using the Gambit meshing software. In the actual working environment of the floating wave-eliminating current machine, using the Fluent fluid simulation software, the volume of fluid (VOF) two-phase flow model is utilized to determine the distribution of the different ratios of the air and liquid water phases in the watershed to identify the different draft depth lines. Moreover, the simulation environment is established using the k-epsilon turbulence model. In this study, three waterlines are simulated and analyzed. Through the analysis of the simulation and experimental results of three different draft depth lines of the comparison device, the optimal draft depth line of the device is determined to be one third. On the basis of the optimal draft depth line, four installation angles of the blades are simulated in the same simulation environment. Using the torque data obtained by the simulation, the torque and power coefficients are calculated, the comparative simulation data are analyzed, and the torque trend graph of the simulation process is obtained to determine the optimal angle of the four blade installation angles. The draft depth line determines the wave-carrying capacity of the device and provides the conditions for the blade to be energized. The blade installation angle directly affects the energy-receiving efficiency of the device. Therefore, the optimal draft depth and blade installation angle denote the capability of the machine to eliminate the current. Moreover, the capacitance efficiency is of considerable significance. |
| Key words: floating wave-eliminating current machine mesh model volume of fluid (VOF) model simulation environment draft depth line installation angle |
