Experimental Investigation of Drag Reduction by Polymer Additives

J. Ocean Eng. Technol. 2002;16(4):1-6.

중합제 첨가에 의한 항력 감소 효과에 관한 실험적 연구

성형진,위장우,권순홍,전호환

한국과학기술원,한국선급,부산대학교기계기술연구소,부산대학교기계기술연구소

Keywords: Polymer Additives, Drag Reduction, Turbulent Intensity, Surface Roughness

핵심용어: 중합체 첨가, 항력 감소, 난류강도, 표면 조도

Abstract

Experimental investigation of drag reduction by adding a polymer additive(polyacrylamid, N-401P) into water is carried out in a Circular Water Channel. The effect of viscosity, surface roughness and degradation as a function of running time is also measured with varying the concentration of polymer additives(20ppm,100ppm) and Reynolds numbers. Near and far wakes past a circular cylinder are observed by LDV. Drag forces are measured with a strain-gaged device. The experimental results show that around 5%-30% of drag reduction with the polymer solution are observed. The larger effects of drag reduction can be found at low range of Reynolds number, more roughened surface cylinder. The effect of polymer solution for near wakes is larger than for far wakes.