Numerical investigation on the influence of rope cutter installation on water flow around a ship’s propeller
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초록
Research and development of marine equipment aimed at improving safety at sea has led to a significant reduction in the occurrence of marine accidents. Studies have revealed that installing a rope cutter device would prevent propeller entanglement, which is a major cause of accidents for small ships sailing in coastal regions. This study investigates the effects of rope cutter installation on the pressure distribution, flow streamlines, velocity vectors, cavitation, and thrust force produced by the propeller using the computa-tional fluid dynamics (CFD) approach. ANSYS Fluent, CFD software was used in this study and simulations were conducted under open sea conditions at a maximum continuous rating (MCR) using actual ship propeller dimensions. As a result, rope cutter installation led to a slight reduction of water flow velocity behind the propeller, lower vapor volume fraction by 5.02%, and lesser turbulence in the flow behind the propeller. There were no visible differences in the pressure distribution around the propeller. The average thrust force produced by the propeller was increased by 1.97% after rope cutter installation while the torque required to rotate the propeller with the rope cutter was higher by 0.965%. The findings indicate that the installation of a rope cutter has no adverse impact on the propeller's operation. This research revealed extra positive effects, including a decrease in vapor formation, water circulation behind the propeller, and a slight increase in the propeller's thrust force.
Abstract
Research and development of marine equipment aimed at improving safety at sea has led to a significant reduction in the occurrence of marine accidents. Studies have revealed that installing a rope cutter device would prevent propeller entanglement, which is a major cause of accidents for small ships sailing in coastal regions. This study investigates the effects of rope cutter installation on the pressure distribution, flow streamlines, velocity vectors, cavitation, and thrust force produced by the propeller using the computa-tional fluid dynamics (CFD) approach. ANSYS Fluent, CFD software was used in this study and simulations were conducted under open sea conditions at a maximum continuous rating (MCR) using actual ship propeller dimensions. As a result, rope cutter installation led to a slight reduction of water flow velocity behind the propeller, lower vapor volume fraction by 5.02%, and lesser turbulence in the flow behind the propeller. There were no visible differences in the pressure distribution around the propeller. The average thrust force produced by the propeller was increased by 1.97% after rope cutter installation while the torque required to rotate the propeller with the rope cutter was higher by 0.965%. The findings indicate that the installation of a rope cutter has no adverse impact on the propeller's operation. This research revealed extra positive effects, including a decrease in vapor formation, water circulation behind the propeller, and a slight increase in the propeller's thrust force.
참고문헌 (16)
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