2軸1舵船の舵特性に関する実験結果について

概要

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By utilizing propeller-rudder system with the absence of the ship body, we conducted experiments concerning normal force acting on a single rudder behind twin propellers. The tests were performed by varying gap between propeller axes, rudder angle, propeller loading and drift angle systematically. From these experimental results, increment of rudder nomal force caused by propeller stream and flow direction in the rudder position are discussed. On the basis of slipstream velocity given by the propeller momentum theory, a simple calculation is made for the normal force on the rudder in non-uniform flow with step velocity profile by using the linear lifting surface theory. An attempt is made in this report to determine values of the correction factor included in the formula giving slipstream velocity, comparing the experimental results with the calculated ones. This consideration yields the following results:when gap between propeller axes is kept constant, the ratio of increase of the normal force due to slipstream may be estimated by adopting constant values as the correction factor regardless of rudder angle. There is a tendency for the correction-factor value to decrease with increase in distance from the propeller to the rudder. According to results of the propeller race measurement, it can be understood that the tendency results from contraction of propeller stream.
社団法人日本船舶海洋工学会の論文
1984-09-30