Numerical investigation to observe combined effect of propeller boss cap fin (PBCF) and propeller duct to improve propel
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ORIGINAL ARTICLE
Numerical investigation to observe combined effect of propeller boss cap fin (PBCF) and propeller duct to improve propeller efficiency Pritam Majumder1 · Dileep Kumar Avanapu1 · Subhendu Maity1 Received: 22 March 2020 / Accepted: 21 September 2020 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2020
Abstract Propeller is the main device in marine vehicle to generate propulsive energy. During practical manoeuvring condition, it losses a major part of energy due to the formation of hub as well as tip vortex. This fact becomes a great concern for researcher and motivates to find some alternate energy saving device (ESD). In this paper numerical investigations, based on Reynolds Average Navier Stokes (RANS) equation, are carried out to observe the combined effect of PBCF and propeller duct as ESDs to improve propeller efficiency. Here, aerofoil shape PBCF with NACA4412 profile has been combined with 19A and 19Am duct to observe their ability to improve propeller efficiency in moving reference frame approach. Along that to make a comparative study, numerical investigations are also performed with propeller and 19A duct without PBCF. Results show that in comparison to the combined effect of PBCF and ducted propeller, only duct (19A) without PBCF plays a prominent role to enhance propeller efficiency by approximately 9.21%. To obtain more details of flow phenomenon, fluctuation of velocity, pressure, vortex strength, etc., at various locations are also investigated. Besides that, the effect of angle of attack of the duct on a PBCF introduced ducted propeller is also investigated numerically. Keywords PBCF · ESD · Efficiency · Duct · Vortex strength · Angle of attack
1 Introduction Propeller is the main device to generate the major propulsive force in marine vehicle. Modern society is giving more concern to water medium transport system compared to other conventional medium due to economic as well as environmental issues. There are significant amount of energy losses in ship propulsion system due to hull resistance, formation of vortex, cavitation, induced vibration, which become a great challenge for modern ship researchers. Energy-saving devices is getting attention of modern researchers for their capability to recover energy losses in conventional propeller. It has been noticed that a lot of research work has been performed on propeller duct for its ability to gain lost energy by reducing tip vortex from the propeller blade tip. Besides that, PBCF also significantly improves propeller efficiency by destroying hub vortex generated from the boss of the propeller. Both ESDs are applied prominently to enhance * Pritam Majumder [email protected] 1
Department of Mechanical Engineering NIT Meghalaya, Shillong 793003, India
propeller efficiency for modern ship industry. But there has not been performed any investigation to observe the combined effect of PBCF and propeller duct to increase propeller efficiency. This inspires to perform a brief numerical study to check the
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