8 気泡流中におけるプロペラ単独特性 : 第1報:気泡吹き出しによる局所ボイド率分布と速度分布計測

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This paper is the first half of the experimental study on propeller characteristics in bubbly flow, and explains the test setup and the realized flow. A bubble generator was placed upstream of the propeller, and the nominal void ratio of the flow going into the propeller was varied between 0% and 5%. The distributions of the local void ratio and the velocity field at the propeller plane were measured using an optical probe and a five-hole Pitot tube, respectively. The measured mean void ratio at the propeller plane increased monotonically in proportion to an increase in airflow rate. The propeller open water test results at no bubble injection changed little by changing the towing speed and the propeller rotation speed. The flow field at the propeller plane was slightly retarded by placing the bubble generator. The bubble injection caused upward flow at the propeller plane due to buoyancy. The magnitude of the z-component of the flow (upward flow) increased in proportion to the average void ratio at the propeller disc, while the x- and y-components showed little change.
社団法人日本船舶海洋工学会の論文