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

采用数值模拟和实验相结合的方法，对鱼形运动的推进性能进行了分析。采用二维波浪翼模型作为推进性能基础研究的对象。人们认为，鱼的推进比使用电机和螺旋桨的船舶具有更高的性能，但从流体力学的角度来理解并不是很清楚。目前问题的主要难点在于流场的不稳定性和非线性。提出了一种估算自航状态下推力和阻力平衡的分析方法，并综合考虑了实验和数值计算结果。经过两年的研究，取得了以下成果：1.建立了完整的类鱼推进分析系统。该集成系统由CFD模拟、水动力测量和PIV测量三个子系统组成。数值模拟结果与实验结果吻合较好，证实了该系统可用于推进机理的细节分析。2.研究了鱼形运动推进性能的基本特征，得到了基本的性能数据集。实现了基于通用机翼运动数据库的综合分析系统，并对机翼运动与推进性能的关系进行了参数研究。提出了一种自航状态下阻力和推力的估算方法，并用于参数研究分析。

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.