해양레저 환경분석과 실험적 기반에 의한 고속 레저선 선형개발에 관한 연구

Abstract

Abstract

A Study on the Hull Form Development of High Speed Leisure Boats on the Basis of Experiment and Analysis for Ocean Leisure Environment

Lee, Il-Soo Advisor : Prof. Park, Je-woong, Ph. D. Dept. of Advanced Marine Transportation System Engineering, Graduate School of Chosun University

Although Korea is a maritime country surrounded by the sea in 3 sides, Korea has avoided the sea in the history rather than making it a part of life. Under the circumstances, the middle aged people or people in their prime of life mostly enjoyed basic water sports such as fishing and swimming instead of other active sports however today's young generation considers the sea, lake, river as a part of their living space and enjoy more active sports and the number of young people enjoying the water sports is increasing.

Considering the ocean leisure environment in Korea, more demand for ocean tour is expected as the accessibility to ocean tourist resources increased due to the opening of the West Coast Expressway, the expansion of airport facilities in Muan, Uljin, and Yangyang, and the construction of Busan New Port, and especially the fishing villages and fishing ports that have empathized the fisheries industry are changing to adapt ocean tourism industry such as windsurfing, yacht, and diving, and they need the ocean leisure equipments to support those ocean tourism industries.

There is a great variety of leisure equipments to enjoy ocean leisure sports however this study made statistical analysis of boats in Australia and Japan who have similar industrial structure as Korea centering on the hull design of high speed leisure boats and used the data for designing initial hull form of high speed leisure boat.

This study analyzed the ocean leisure environment, examined the direction of development for the leisure boat related technologies in Korea and their current issues, and searched for the solutions for such issues centering on the high speed leisure boat type development plan. Especially, this study discussed how the ocean leisure industry will develop in the southwestern region of Korea which will hold Yeosu Ocean Expo 2012 and has optimum natural environment for the industry.

This study discussed the current status and the prospect of ocean leisure industry, especially about the direction of development of leisure boat related technologies in Korea, the prospect of the development of ocean leisure sports industry in the southwestern region of Korea, current issues and possible solutions based on the assumption that the demand for ocean leisure sports in Korea will increase enormously

This study discussed the characteristics of and the research trend about the high speed leisure boat, designed the hull form of high speed leisure boat through systematic analysis based on the data of existing single hulled and tunnel type high speed leisure boats, and made hydromechanic performance evaluation through the tank test.

For the hull form plan of the single hulled high speed powerboats for which Korea has accumulated quite a bit of technological strength and which is popularly constructed in Korea, a small 3t class boat with the speed range of maximum 35 knots and approximately 7.0m of total length was designed based on statistical analysis of available data. The performance of the planned hull form was analyzed through the circulating water channel test. For the tunnel type powerboat which is appropriate for relatively shallow coasts, puts out high speed while maintaining stability, a small boat with approximately 6.07.0m of total length was designed and the performance was analyzed through the circulating water channel test.

A commercial software, FLUENT 6.2 was used to analyze the hydromechanic characteristics of the planned hull form, and the calculation result was compared with the result of the circulating water channel test to determine whether this numerical analysis technique can be applied to the high speed gliding boat.

Using the fact that the sailing position of single hulled high speed leisure boat is largely affected by the increase of speed and the appendages such as side wings, this study made the flow analysis around the boat and analyzed its relationship with the resistance performance and compared the results with the model test results and suggested the possibility for application.

For tunnel type high speed leisure boat, the flow analysis around the boat was performed in reference to the tunnel depth and the change of shape and its relationship with the resistance performance was analyzed based on the model test, and the 3-dimensional structure analysis for slamming weight and the structure stability test were performed using the structural analysis software, NISA-II.

The following is the comprehensive conclusion of this study.

- This study examined and analyzed the ocean leisure environment and the status of the industry and talked about how the ocean leisure industry will develop. Especially, the southwestern region of Korea has excellent natural environment that it is expected to become the center of ocean leisure sports in Korea along with the Yeosu Expo 2012.

- This study statistically analyzed the overseas data of existing small and approximately 7m long high speed powerboats with the minimum speed of 30 knots and suggested the design schemes for two leisure boats that can be quite useful for determining major principle items when developing initial hull form.

- This study derived the correlation equation for determining the dimensions of major parts of the single hulled and tunnel type high speed powerboats using the data collected for this study.

- For single hull high speed power boat, the most excellent resistance performance was found when no appendages were applied in the medium speed range near 2025 knot however the overall resistance performance was improved by attaching side wings near 30 knot.

- For such side wings can have great impact on the rolling stability, attaching side wings also appears to be a good scheme. When trim-tab was attached to the stern, the prow sank remarkably and greatly worsened the resistance that it is necessary to have further studies to find the optimum size for the trim-tab.

- For tunnel type high speed powerboat, the tunnel depth has great impact on the difference of resistance performance. Reducing the tunnel depth will give an advantage in terms of the resistance performance however it requires further studies considering the propulsion performance. and it is necessary to examine the structural stability considering the increase of pressure in the prow.

- The commercial CFD Code, FLUENT, can be quite useful in developing initial hull form of high speed leisure boat, and it is expected to estimate the hydromechanic performance more similar to actual phenomenon through large scale computing using parallel computer in the future.