종황비에 따른 오일펜스용 모형 전개 장치의 전개력

Spreading forces of model spreading devices for oil fence by aspect ratio

In order to investigate the spreading performance of model canvas plates of spreading devices for oil fence by aspect ratios and spreading force FL and drag FD acting on them in a circulating water channel, 3 types of rectangular canvas plates with aspect ratios of 1/1.2, 1, and 1.2, respectively were manufactured. FL and FD is described as FL=CL(1/2)pSv² and FD=CD(1/2)pSv², where p is water density, S is the projected area of canvas, and v is current speed, respectively. The maximum spreading force coefficients CL at current speed of 0.2, 04 and 0.6 m/s were 1.5-1.6 at attack angle of 32-38° in case of aspect ratio with 1/1.2, 1.7-1.8 at attack angle of 38-44° in case of aspect ratio with 1, and 1.8-1.9 at attack angle of 40-46° in case of aspect ratio with 1.2, respectively. In addition, the ratios of CL to CD were 1.41 in case of aspect ratio with 1/1.2, 2.01 in 1, and 2.0, and 3-3.4 in 1.2, respectively.