表面粗度と摩擦抵抗について (第1報) : モデル粗面による船速低下への影響

概要

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Five roughness models that were found on the hull surfaces of ships in service were prepared on the test plates. Frictional resistance coefficient (C_F) of these test plates were measured in the circulating water channel and following results were deduced. (1) A painted surface which was carefully applied with airless spraying had 40μm in BSRA roughness but its C_F value was as same as that of smooth surface of glass plate. (2) The C_F of orange peel surface of antifouling paint was bigger than that of the shallow eroded surface in spite of BSRA roughness values of the two were almost same. (3) Three roughness models in this experiment can be said as sand roughness by their curves in frictional resistance test and it is difficult to say that BSRA roughness of these roughness models are mutually related to their equivalent sand roughness by their k_S/k_<BSRA> values. (4) Ship speed reduction deduced from frictional resistance values of roughness models was 0.2-2 knot in low-speed, blunt ship and 0.3-3 knot in high-speed, fine ship.
社団法人日本船舶海洋工学会の論文
1984-09-30