Basic Study on the Analysis of Propulsive Performance of Fish-Like Motion

点击翻译按钮获取中文摘要

The propulsive performance of fish-like motion was analyzed by means of integrated system of numerical simulations and experiments. The two-dimensional waving wing model was employed for the target of basic study of propulsive performance. It has been believed that the propulsion of fishes produces higher performance than that of ships using motor and propeller, but the understanding by means of hydrodynamics were not achieved clearly. The main difficulties of present problem existed in the unsteadiness and non-linearity of flow field. An analysis approach, which estimates the thrust and drag balance at the self-propulsion condition, was proposed, and the experimental and numerical results were considered. Following results were achieved through the two years project.1.The integrated system for the analysis of fish-like propulsion has been established. The integrated system consists of sub-systems of CFD simulation, hydrodynamic force measurement and PIV measurement. The results of numerical simulation and experiment show good agreements, and it has been confirmed that the system could be used for the analysis of the detail of propulsive mechanisms.2.The basic feature of propulsive performance of fish-like motion was investigated, and basic data set of the performance has been obtained. The integrated analysis system based on the common database of wing motion, and parametric study on the relationship between wing motion and propulsive performance was realized. An estimation method for the drag and thrust under self-propulsion condition was proposed, and it was used for the analysis of parametric study.