エアクッション船の基礎的研究

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This report deals with the studies of Marine ACV which have been carried out in Ship Research Institute since 1964. The research fields cover aerodynamic studies of peripheral jet type ACV by using wind tunnel, tank tests of sidewall ACV, computer simulation to estimate the performance of sidewall ACV propelledby waterjets, and comments for noise problems. These studies are summarized as follows ; 1) From the experiments using both freely towed model and self-propelling model with waterjets, the measured drag was broken down into its components-profile aerodynamic drag, air momentum drag, sidewall frictional drag, skirts frictional drag and wave-making drag. Wave-making drag was calculated by using the theory of Newman & Poole, Barratt and Plissov theory. Theoretical values of wave-making drag were compared with the values measured along a longitudinal cut (Newman-Sharma method). The experiments agree well with the theory except the low Froude number region. The wetting area of sidewalls and skirt drag were estimated by the experimental results. The effects of the waterjet inlet geometry and inlet velocity ratio on the inlet loss and inlet interaction drag were examind by both wind tunnel tests and selfpropelling waterjet model tests. It was found that negative inlet interaction drag could occur according to inlet velocity ratio. The minimum inlet loss causes at some inlet velocity ratio. The propulsive performance of a sidewall ACV was discussed based on the model tests. 2) The parametric design studies were examined using Computer simulation. According to the all-up weight and speed, there is a optimum cushion aspect ratio and cushion pressure which makes effective drag lift ratio minimum. The sidewall ACV which design Froude number is high tends to have higher cushion aspect ratio and cushion pressure. The design studies of thausands ton class sidewall ACV are discussed from the view point of effective drag lift ratio which depends on the design speed. 3) Aerodynamic drag was analyzed based on the experimental data obtained by wind tunnel tests using both a fan equipped model and a model fed air through pipe. The effects of air jet flow on the aerodynamic drag were considered. Noise caused by a commercial ACV was measured in Toba port. Noise level around the ACV was analysed and the noise contour line was obtained.
独立行政法人海上技術安全研究所の論文
1986-03-31

エアクッション船の基礎的研究

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