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수치해석을 이용한 터널스러스터 외벽의 모따기 효과 고찰
송지수(G.S. Song),오세면(S.M. Oh),박광근(K.K. Park),홍춘범(C.B. Hong) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
The ducted propeller, combination of KA4-70 and 19A duct, was carried out to validate the numerical simulation methodology. The numerical simulation results showed good agreement with experimental data produced by SSMB. Then, numerical simulations for the effect of chamfering in tunnel thruster outside were performed. From this study, we analyzed the effect of chamfering by comparing the thrust.
수치해석을 이용한 터널스러스터 외벽의 모따기 효과 고찰
송지수(G.S. Song),오세면(S.M. Oh),박광근(K.K. Park),홍춘범(C.B. Hong) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
The ducted propeller, combination of KA4-70 and 19A duct, was carried out to validate the numerical simulation methodology. The numerical simulation results showed good agreement with experimental data produced by SSMB. Then, numerical simulations for the effect of chamfering in tunnel thruster outside were performed. From this study, we analyzed the effect of chamfering by comparing the thrust.
송지수(G.S. Song),이성욱(S.W. Lee) 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.1
The influence of free surface for the ducted propeller was investigated based on the numerical simulation in this paper. The ducted propeller consists of a duct with 19A section and the KA4-70 propeller. The immersion ratio was defined as the non-dimensional value between the distance from propeller axis to free surface and diameter of propeller. In this study, 4 immersion ratios were considered as 0.75, 1, 1.25, and 1.5, and the results from each condition were compared to those of fully immersed condition, respectively. As the immersion ratio is decreased, the total thrust and torque of the ducted propeller tend to be decreased, in particular, the portion of thrust reduction on the duct was greater than that of the propeller. It was observed that the pressure on duct is asymmetrically distributed due to the effect of free surface, on the contrary, it is axis-symmetrical in fully immersed condition. And the free surface behind the ducted propeller system is observed in the shape of “V”. As the immersion ratio decreases, the difference between crest and though of free surface was increased.