• Title, Summary, Keyword: Propeller performance prediction

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PROPULSIVE PERFORMANCE PREDICTION OF A DUCTED PROPELLER IN OPEN WATER CONDITION USING CFD (CFD를 이용한 덕트 프로펠러 단독 상태에서의 추진 성능 예측)

  • Lee, K.-U.;Jin, D.-H.;Lee, S.-W.
    • Journal of computational fluids engineering
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    • v.20 no.2
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    • pp.1-6
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    • 2015
  • In this study, a numerical prediction on propulsive performance of a ducted propeller in open water condition was carried out by solving Reynolds averaged Navier-Stokes(RANS) equation using computational fluid dynamics(CFD). A configuration of propeller Ka-470 inside duct 19A was considered. Hexahedral grid system was generated by dividing whole computational domain into three separate regions; propeller, duct and outer flow region. A commercial CFD software, ANSYS-CFX was used for numerical simulations. Results were compared with experimental data and showed considerable improvement in accuracy, in comparison to those from surface panel method which is based on potential flow assumption. The results also exhibited the importance of grid system within the gap between the inner surface of duct and blade tip for accurate prediction of propulsive performance of ducted propeller.

Development of Internet-Based Marine Propeller Design and Analysis System (인터넷 기반 선박용 프로펠러 설계 및 해석 시스템 개발)

  • Jang, Hyun-Gil;Ahn, Byoung-Kwon;Moon, Il-Sung;Lee, Chang-Sup
    • Journal of Ocean Engineering and Technology
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    • v.24 no.4
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    • pp.66-71
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    • 2010
  • Numerical prediction of propeller performance plays an important role in a marine propeller design process. Program developers are consistently trying to improve diminish predicted errors, and program users need to keep up with the latest ones with minimum expenditure of time and money. We have developed an internet based design system in which clients can design propellers with remote access. In this paper, optimized Internet based Propeller Design and Analysis System (iProDAS) for transferences of the massive data is presented, and a sample design using iProDAS is examined.

Study on the Contra-Rotating Propeller system design and full-scale performance prediction method

  • Min, Keh-Sik;Chang, Bong-Jun;Seo, Heung-Won
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.1 no.1
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    • pp.29-38
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    • 2009
  • A ship's screw-propeller produces thrust by rotation and, at the same time, generates rotational flow behind the propeller. This rotational flow has no contribution to the generation of thrust, but instead produces energy loss. By recovering part of the lost energy in the rotational flow, therefore, it is possible to improve the propulsion efficiency. The contra-rotating propeller (CRP) system is the representing example of such devices. Unfortunately, however, neither a design method nor a full-scale performance prediction procedure for the CRP system has been well established yet. The authors have long performed studies on the CRP system, and some of the results from the authors' studies shall be presented and discussed.

Proposal for Improvement in Prediction of Marine Propeller Performance Using Vortex Lattice Method (와류격자법에 의한 프로펠러 성능추정 향상을 위한 제안)

  • Suh, Sung-Bu
    • Journal of Ocean Engineering and Technology
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    • v.25 no.4
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    • pp.48-53
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    • 2011
  • Current trends in propeller design have led to the need for extremely complex blade shapes, which place great demands on the accuracy of design and analysis methods. This paper presents a new proposal for improving the prediction of propeller performance with a vortex lattice method using the lifting surface theory. The paper presents a review of the theory and a description of the numerical methods employed. For 8 different propellers, the open water characteristics are calculated and compared with experimental data. The results are in good agreement in the region of a high advanced velocity, but there are differences in the other case. We have corrected the parameters for the trailing wake modeling in this paper, and repeated the calculation. The new calculation results are more in agreement with the experimental data.

Flow simulation and efficiency hill chart prediction for a Propeller turbine

  • Vu, Thi;Koller, Marcel;Gauthier, Maxime;Deschenes, Claire
    • International Journal of Fluid Machinery and Systems
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    • v.4 no.2
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    • pp.243-254
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    • 2011
  • In the present paper, we focus on the flow computation of a low head Propeller turbine at a wide range of design and off-design operating conditions. First, we will present the results on the efficiency hill chart prediction of the Propeller turbine and discuss the consequences of using non-homologous blade geometries for the CFD simulation. The flow characteristics of the entire turbine will be also investigated and compared with experimental data at different measurement planes. Two operating conditions are selected, the first one at the best efficiency point and the second one at part load condition. At the same time, for the same selected operating points, the numerical results for the entire turbine simulation will be compared with flow simulation with our standard stage calculation approach which includes only guide vane, runner and draft tube geometries.

Recent Application of CFD in Ship Hydrodynamics

  • Kawamura, Takafumi
    • 한국전산유체공학회:학술대회논문집
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    • pp.321-326
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    • 2008
  • The engineering use of CFD is recently extending to the prediction of maneuvering characteristics, response to waves, propeller performance, and so on. The focus of the research is shifting to simulation of more complex processes. Typical examples of such processes are bow or stern slamming, green water problem, propeller cavitation, hull-propeller interaction, or drag reduction by bubble injection. Those processes are characterized by keywords such as high nonlinearity, unsteadiness, multiphase flow. In this paper, two new attempts which have been recently made by the author's research group are presented. One is the prediction of propeller cavitation and its effect to the ship hull. The other is the application to the drag reduction by use of air bubbles.

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Recent Application of CFD in ship Hydrodynamics

  • Kawamura, Takafumi
    • 한국전산유체공학회:학술대회논문집
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    • pp.321-326
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    • 2008
  • The engineering use of CFD is recently extending to the prediction of maneuvering characteristics, response to waves, propeller performance, and so on. The focus of the research is shifting to simulation of more complex processes. Typical examples of such processes are bow or stern slamming, green water problem, propeller cavitation, hull-propeller interaction, or drag reduction by bubble injection. Those processes are characterized by keywords such as high nonlinearity, unsteadiness, multiphase flow. In this paper, two new attempts which have been recently made by the author's research grop are presented. One is the prediction of propeller cavitation and its effect to the ship hull. The others is the application to the drag reduction by use of air bubbles.

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Flexible CFD meshing strategy for prediction of ship resistance and propulsion performance

  • Seo, Jeong-Hwa;Seol, Dong-Myung;Lee, Ju-Hyun;Rhee, Shin-Hyung
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.2 no.3
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    • pp.139-145
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    • 2010
  • In the present study, we conducted resistance test, propeller open water test and self-propulsion test for a ship's resistance and propulsion performance, using computational fluid dynamics techniques, where a Reynolds-averaged Navier-Stokes equations solver was employed. For convenience of mesh generation, unstructured meshes were used in the bow and stern region of a ship, where the hull shape is formed of delicate curved surfaces. On the other hand, structured meshes were generated for the middle part of the hull and the rest of the domain, i.e., the region of relatively simple geometry. To facilitate the rotating propeller for propeller open water test and self-propulsion test, a sliding mesh technique was adopted. Free-surface effects were included by employing the volume of fluid method for multi-phase flows. The computational results were validated by comparing with the existing experimental data.

Numerical Flow Analysis of Propeller Type Pump (프로펠러식 펌프의 전산 유동 해석)

  • Yu, Hye-Ran;Park, Warn-Gyu
    • The KSFM Journal of Fluid Machinery
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    • v.9 no.6
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    • pp.29-34
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    • 2006
  • Propeller type pump has been widely used for pumping water in agricultural and manufacturing industry. Since a propeller type pump contains a screw impeller inside a circular casing, the numerical analysis becomes complex. However, the accurate prediction of viscous flow is essential for computing hydrodynamic performances. To analysis the flow and the performance of the propeller type pump, the present work has solved 3D incompressible RANS equations on the multiblocked grid. From the present calculation, small amount of flow separation was shown near hub and the flow was recovered to nearly uniform inflow after one diameter downstream. Torque and thrust coefficient were computed and compared with experiments.

Analysis and Calibration of Propeller Power Effect for Turboprop Aircraft (터보프롭 항공기의 프로펠러 파워효과 해석 및 보정)

  • Park, Youngmin;Chung, Jindeog
    • Journal of Aerospace System Engineering
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    • v.9 no.4
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    • pp.62-66
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    • 2015
  • During the conceptual design of turboprop aircraft, the power effect driven from rotating propeller is typically obtained from empirical data. In the present paper, propeller power effect was obtained by using unsteady three-dimensional Navier-Stokes solver with $k-{\omega}$ turbulence model for the accurate prediction of turboprop aircraft performance. In order to simulate the relative motion between propeller and fuselage, unsteady sliding mesh method was used. During simulation, three flow conditions such as climb, cruise and descending flight were selected considering the flight envelop of the real turboprop aircraft. For the correction of aerodynamic coefficients, the thrust effect of engine exhaust gas was included based on the engine manufacturer's data. Using the computational results, the correction table for the aerodynamic coefficient of turboprop aircraft was suggested for the performance analysis of turboprop aircraft.