Study on Performance of Asymmetric Pre-Swirl Stator according to Variations in Dimensions and Blade Tip Shape

신, 용진; 김, 문찬; 강, 진구; 이, 준형

doi:10.5574/ksoe.2016.30.6.431

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…Regarding stator design, the pitch angle is the most important factor. In a previous study [24], the potential-based pitch design showed a good correlation with the experimental results. In the case of duct design, the duct angle is determined by aligning the flow direction through CFD computation [26], and NSMB Nozzle 19A was adopted for the present foil shape.…”

Section: Design Of Ring Statorsupporting

confidence: 55%

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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: Design Of Ring Statorsupporting

confidence: 55%

“…Adjusting the variable pre-swirl stator changes the circulation force Г for each radius. Since Г expresses the load applied to the blade, the performance can be compared through [24]. The PASTA program expresses Г as an equivalent angle of attack, α E , to enable intuitive analysis.…”

Section: Potential Analysismentioning

confidence: 99%

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

Kang

Kim

Shin

2022

JMSE

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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%

“…where G is non-dimensional circulation as given by G = In the present study, the asymmetric pre-swirl stator proposed by Shin et al [16] was used, as shown in Tables 1 and 2. The equivalent incident angle is verified, as shown in Fig.…”

Section: = ρVmentioning

confidence: 99%

“…However, the drag of stator in case of container ships, which is the subject of this paper, increases significantly when large pitch angles are adopted. Therefore, the maximum angle is designated as −12°, which is slightly lower than the equivalent incidence angle used for lowspeed full body ships [16]. Table 3 shows the pitch angles for each blade, and Fig.…”

Section: = ρVmentioning

confidence: 99%

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

Shin

Kim

Kang

et al. 2019

brod

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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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