加減速する平板の抵抗について

概要

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This report deals with the resistance of flat plate under the constant acceleration or deceleration. In the former part, the resistance experiments of flat plates are reported. In the latter part, making use of Karman's momentum equation, the approximate calculations of flat plates resistances under accelerations are carried out and the calculated results are compared with those of experiments. The main results obtained are as follows; (1) |ΔR_f/R_<f0>| increases in the low speed range. (2) |ΔR_f/R_<f0>| increases as increasing acceleration or deceleration. (3) |ΔR_f/R_<f0>| takes about the same value in the both cases of smooth and roughened flat plates. (4) As seen in Fig. 17, |ΔR_f/R_<f0>| can be arranged with Froude number. where, ΔR_f means the augmented frictional resistance due to the acceleration, and R_<f0> means the frictional resistance in the steady velocity.
社団法人日本船舶海洋工学会の論文
1985-03-22