Experimental Investigation into Roughness of Hull Surface and Increase of Skin Frictional Resistance
Experimental Investigation into Roughness of Hull Surface and Increase of Skin Frictional Resistance
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船体表面粗糙度与增加蒙皮摩擦阻力的实验研究
DOI：
10.2534/jjasnaoe1952.1965.58
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发表时间：
1965
期刊：
影响因子：
--
通讯作者：
A. Ogawa
中科院分区：
文献类型：
--
作者：
H. Sasajima;T. Terao;Koichi Yoko;M. Nakato;A. Ogawa
为探讨船体表面粗糙度与表面摩擦阻力增加的关系，应遵循以下步骤。都被带走了；I)便携式粗糙度记录仪的研制，ii)新建船舶和服役1-5年后的船体表面的粗糙度测量，iii)类似于实际船体的钢板的阻力试验，iv)相同的钢板在海水中浸泡10-49个月，v)清洗和重新喷漆后的潜板的阻力试验。上述研究的主要结果总结如下：a)新建船体的粗糙度用H_(3060)λ0.7表示，式中H：以微米为单位的视在幅度。λ：以厘米为单位的视在波长。b)在役船舶和水下试验板的粗糙度结构在趋势上是一致的。C)ΔCFs与ΔCFm之间的近似关系可用ΔCFs_？_ΔCFm·(CFs/cfm)2·式中，ΔCf：由于粗糙度引起的Cf增加，Cf：光滑表面的摩擦阻力系数，“S”，“m”：代表“船”和“模型”的后缀。
To investigate the relation between the roughness of hull surface and increase of skin frictional resistance, following procedures. were taken;i) preparation of a portable roughness recorder, ii) roughness measurements of hull surface of newly built ships and of a ship after 1 & 5 years service, iii) resistance test of steel plates similarly treated as actual ship hull, iv) the same plates were submerged in sea water for 10 to 49 months, v) resistance test of the submerged plates after cleaned and repainted, as ships in docking Main results of the above research are summarized as follows.a) Roughness of newly built hull are expressed byH_??_ (3060) λ0.7, where H : apparent amplitude in micron.λ : apparent wave length in centimeter.b) Roughness configuration of the ship in service and of the submerged test plates are coincident in tendency. From this, the results of our resistance tests can be applied to estimate the augmented resistance of actual ships.c) Approximate relation between ΔCfs and ΔCfm, can be expressed byΔCfs_??_ΔCfm· (Cfs/Cfm) 2·where ΔCf : augmentation of Cf due to roughness, Cf : frictional resistance coefficient of smooth surface, “s”, “m” : suffix representing “ship” and “model”.