濟州 테우의 縱方向 틈에 의한 에너지 損失效果

Abstract

Among the methods of approaching marine engineering-related topics, to get an optimal gap of the Tewoo pontoon system through a hydraulic model test using a 2-D tank, an analysis on porosity divided into 9 cases were carried out and the results are as follows: As the wave penetrates through the porous (gap) of the Tewoo pontoon system model, it was found that there is a wave energy loss because the phenomenon of the separation of the gap due to the eddy of the Tewoo In the overall trend by wave-height meter data, reflexibility increases to the domain with high frequency as the wavelength get shorter while the penetration ratio. In contrast, increases to the domain with low frequency as the wavelength get longer. On the other hand, energy loss rate showed the same tendency as that of reflexibility. Reflexibility had a tendency in which the greater the porosity was, the narrower the distribution range of measured data and the less the average value got, and at porosity p=0.2518, a phenomenon in which the specifically distribution range of data and the average value got lower. Penetration ratio, in the opposite phenomenon to reflexibility, had a tendency in which the greater the porosity was, the wider the measured data scope got around the average value, and the greater the average value gradually got, and especially, at porosity p=0.000 and p=0.2518, the data scope appeared narrow, but the average value was the lowest at p=0.2518. On the other hand, energy loss rate increased linearly as porosity got greater around porosity p=0.2518, but it decreased around the peak. Through the above results, a comparative analysis on the penetration ratio, reflexibility and energy loss rate among the Tewoo pontoon system models with different porosity, the gap area of the model with the lowest penetration ratio and reflexibility was 0.23㎡ (p=0.2518, Width of porous(w)=0.2600m) while the porous area with the model with the highest energy loss rate was also 0.23㎡ (p=0.2518, w=0.2600m), so in terms of the breaking efficiency and wave energy absorption of the Tewoo pontoon system model, the area of the gap with the optimum efficiency can be said to be 0.23㎡ (p=0.2518, w=0.2600m). Since the porosity with the optimum efficiency in terms of the breaking efficiency and wave energy absorption of the Tewoo pontoon system model against the wave coming from the front stem was p=0.2518, it could be judged that the interval of the longitudinal porous (gap) of the system would have the optimum efficiency at 0.2600m.