대형 캐비테이션터널에서 펌프젯 추진기 단독성능 시험 및 해석 기법 연구

Abstract

In order to study the open-water test & analysis techniques for pumpjet propulsors in the Large Cavitation Tunnel (LCT), at Korea Research Institute of Ships and Ocean Engineering, set of test equipment was designed and manufactured. The pumpjet propulsor is composed of rotor, stator & duct which results in the strong interaction between the components. To measure the thrust and torque for duct and stator, a ring-shaped sensor was developed. The test equipment including pumpjet is installed on an existing POW dynamometer in the reverse direction. The results from the reverse POW test setup were validated against those from conventional POW test setup in the towing tank (TT) as well as in the LCT. The pumpjet open-water test was conducted at the Reynolds number of around 1.0×106, at which the obtained experimental data became stable in the Reynolds number effect test. The open-water test for the rotor (rotor-only) was conducted to study whether the duct and stator should be considered as a part of the hull or the propulsor. On the basis of the test results, it was shown that the duct and stator could be included in the propulsor. The total thrust, combined thrust of rotor, duct & stator was used for the pumpjet open-water test analysis. As the whole pumpjet is defined as a propulsor, it is thought that the self-propulsion test & analysis could be conducted in the same way as that of the conventional propeller.