Design of Asymmetric Pre-swirl Stator for LNG Carrier according to Variation of Stator Shapes

이철민,; 신용진,; 김문찬,; 최정은,; 전호환,

doi:10.3744/snak.2016.53.1.37

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…Additionally, the chord and thickness of the stator are designed to be 10% less than those of the optimized corresponding values in [7], that is, almost the minimum value in consideration of structural strength. The most important parameter of the equivalent angle was determined to be 14 • , which has been proven in various previous studies [27,28]. The ring stator is longitudinally located at 0.5R of the propeller, just ahead of the propeller position.…”

Section: Initial Reference Casementioning

confidence: 81%

Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Kang

Kim

Shin

2022

JMSE

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This study is a parametric investigation of the application of a compact type of pre-swirl duct for a slender aft-body 158k crude oil carrier. The International Maritime Organization (IMO) has created the Energy Efficiency Design Index (EEDI), which is an index related to carbon dioxide emissions, to enforce regulations on newly built ships; many solutions have been proposed, including an increase in propulsion efficiency. In the present study, a new type of energy-saving device (pre-swirl duct), the so-called ring stator, is proposed for 158k crude oil carriers, the hull form of which has been developed as a slender after-body full form to reduce the resistance by delaying separation. A conventional pre-swirl duct is no longer effective at the slender aft-body hull forms because of the small radial flow to the propeller. A parametric study was conducted through Computational Fluid Dynamics (CFD) analysis using the commercial program Star-CCM+, and an improvement of approximately 3% in the propulsion efficiency was achieved in the present study. The efficiency gain was validated through a comparison with the experimental results. The developed ring stator may become applicable to container ships through further parametric studies in the near future.

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Section: Initial Reference Casementioning

confidence: 81%

Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Kang

Kim

Shin

2022

JMSE

Self Cite

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“…The interaction between propeller and stator is considered by iterative scheme and in that case the treatment of stator's wake has to be carefully done. Lee et al [15] and Shin et al [16] determined the pitch angle of an asymmetric pre-swirl stator using the PASTA program and found that the efficiency increased by 4-5%. However, the optimal pitch angle corresponding to maximum efficiency needs to be verified.…”

Section: Fig 3 Profile Of An Asymmetric Pre-swirl Statormentioning

confidence: 99%

Validation of Optimally Designed Stator-Propeller System by Efd and CFD

Shin

Kim

Kang

et al. 2019

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The development of energy-saving devices to lower the energy efficiency design index (EEDI) of ships has been actively researched worldwide. One such device is an asymmetric pre-swirl stator, which helps to improve the propulsion efficiency by recovering the rotational energy generated during propeller rotation. Determining the pitch angle is the most important factor in the design of an efficient asymmetric pre-swirl stator. To optimize the pitch angle of an asymmetric pre-swirl stator, this study deals with potential-flow, computational fluid dynamics, and model tests. The model delivered power at a design speed of 24 kt was compared by changing the pitch angle by ±2° with respect to the reference angle designed using a potential-flow program. The commercial code Star-CCM+ was used for the numerical analysis, and the model was also tested in a towing tank at Pusan National University. This study proposes an effective method for determining and verifying the optimal pitch angle of an asymmetric pre-swirl stator.

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“…The in-house developed potential code (PASTA) was used for the design [24], and Star CCM+ v15.04 was used for CFD computations. The CFD analysis was verified by a grid dependence test, and a comparison with experimental results from the David Taylor Research Center (DTRC) and the Korea Research Institute of Ship & Ocean Engineering (KRISO) was performed for validation.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Hydrodynamic Characteristics of the Pumpjet Propulsor for the SUBOFF Submarine

Kim,

Park

et al. 2023

JMSE

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Submarines with pumpjet propulsors have recently been used in many countries to improve their propulsion and noise performance. The pumpjet has the advantage of improving noise and cavitation performance by increasing the pressure inside the duct, and it has good efficiency at a low advance ratio. This study analyzed the propulsive performance of a pumpjet propulsor affixed to a SUBOFF submarine as a function of variations in the design parameters using computational fluid dynamics analysis. The incidence angle and camber of the duct and the pitch angle of the stator were selected as the design parameters. To investigate the propulsion performance as a function of the design parameter variations, each case’s thrust, torque, and efficiency were compared, and the velocity and pressure fields of each case were analyzed. In addition, the efficiency was analyzed using the non-dimensional mass flow rate and area ratio difference for each case. The duct incidence angle contributed most dominantly to the dimensionless flow rate and the difference in area ratio, and these two factors resulted in high efficiency at certain values. It is expected that further research will be conducted in the near future that takes into account cavitation inception speed and cavitation.

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Design of Asymmetric Pre-swirl Stator for LNG Carrier according to Variation of Stator Shapes

Cited by 10 publications

References 1 publication

Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Study on Compact Pre-Swirl Duct for Slender Aft-Body Crude Oil Carrier

Validation of Optimally Designed Stator-Propeller System by Efd and CFD

Parametric Study of the Hydrodynamic Characteristics of the Pumpjet Propulsor for the SUBOFF Submarine

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