날개수에 따른 허브리스 림 추진기의 성능 분석 : CFD를 이용한 접근
Performance analysis of hubless rim-driven thruster based on the number of blades: a CFD approach
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
본 연구에서는 고정된 피치비와 확장면적비를 바탕으로 전산유체역학을 활용하여 다양한 날개 수를 가진 허브리스 림 추진기의 성능을 분석하였다. 날개 수에 따른 추력 계수, 토크 계수 및 효율을 평가하였으며, 날개의 토출면과 흡입면에서의 압력 분포도 상세히 조사하였다. 연구 결과, 전진비가 증가함에 따라 추력 계수는 감소하였고, 가장 낮은 전진비에서 최대 추력이 관찰되었다. 날개 수가 3개, 4개, 5개, 6개일 경우, 전진비가 높아질수록 토크 계수가 감소하는 경향을 보였으나, 날개 수가 7개 또는 8개일 경우에는 전진비가 높아질수록 토크 계수가 증가하는 경향을 나타났다. 낮은 전진비에서 높은 전진비로 이동함에 따라 효율은 처음에는 증가하다가 감소하는 경향을 보였으며, 최대 효율은 전진비 0.8에서 나타났다. 특히, 날개 수가 3개일 때는 모든 전진비에서 높은 효율을 보였다. 토출면에서는 앞전에서 높은 압력이 관찰되었으며, 뒷전에서는 낮은 압력이 나타났다. 흡입면에서는 날개 수가 3개일 때 날개 외곽 뒷전에서 높은 압력이 발생하였고, 날개 수가 증가함에 따라 이 부분의 압력은 감소하여 앞전과 뒷전에서의 압력 분포가 균일해졌다. 향후 이러한 결과는 날개 수 3개의 허브리스 림 추진기 설계 시 도움이 될 것이다.
Abstract
We analyzed the performance of hubless rim propellers based on the number of blades, maintaining a fixed pitch ratio and expanded area ratio, using computational fluid dynamics (CFD). Thrust coefficient, torque coefficient and efficiency according to the number of blades were analyzed. In addition, the pressure distribution on the discharge and suction sides of the blade was analyzed. As the advance ratio increases, the thrust coefficient decreases. The highest thrust was shown when the advance ratio was lowest. For the three, four, five and six-blades, the torque coefficient tended to decrease as the advance ratio increased. In the case of seven and eight-blades, the torque coefficient tended to increase as the advance ratio increased. The maximum efficiency was found when the advance ratio was 0.8. When the three-blade, it showed high efficiency at all advance ratios. A high pressure distribution was observed at the leading edge of the discharge blade, and a low pressure distribution was observed at the trailing edge. Applying a hubless rim-driven thruster with the three-blade can generate higher thrust and increase work efficiency.
참고문헌 (15)
- Celik IB, "Procedure for estimation and reporting of uncertainty due to discretization in CFD applications", J Fluids Eng Trans ASME, 130, pp.0780011~0780014 (2008)[DOI]
- Chen Y, "Longitudinal vibration and unsteady thrust transmission of the rim driven thruster induced by ingested turbulence", Ocean Eng, 131, pp.149~161 (2017)[DOI]
- Hsieh MF, "Integrated design and realization of a hubless rim-driven thruster", IECON Proceedings (Industrial Electronics Conference), pp.3033~3038 (2007)
- Jiang H, "Numerical investigation on hydrodynamic performance of a novel shaftless rim-driven counter-rotating thruster considering gap fluid", Appl Ocean Res, 118, pp.102967~ (2022)[DOI]
- Kim DY, "Study on attack-angle optimization of a Rim-driven propeller using CFD", J Korean Soc Mar Eng, 43, pp.701~709 (2019)[DOI]
- Kim DY, "Fundamental design of a 75-kW-rim-driven propeller", J Korean Soc Mar Eng, 43, pp.31~39 (2019)[DOI]
- Lee CJ, "A study on the wake characteristics of rim-driven propeller for underwater robot using the PIV", J Korean Soc Fish Technol, 58, pp.68~74 (2022)[DOI]
- Roache PJ, "Perspective : A method for uniform reporting of grid refinement studies", J Fluids Eng, 116, pp.405~413 (1994)[DOI]
- Roache PJ, "Conservatism of the grid convergence index in finite volume computations on steady-state fluid flow and heat transfer", J Fluid Eng, 125, pp.731~739 (2003)
- Santoso A, "Performance analysis rim driven propeller as a propulsor using open water test", Int J Mar Eng Innov Res, 2, pp.2548~1479 (2017)[DOI]
- Song BW, "Open water performance comparison between hub-type and hubless rim driven thrusters based on CFD method", Ocean Eng, 103, pp.55~63 (2015)[DOI]
- Witte M, "Identification of coherent flow structures and experimental analysis of the hydroacoustic emission of a hubless propeller", Ocean Eng, 188, pp.106248~ (2019)[DOI]
- Yakovlev AY, "Numerical design and experimental verification of a RIM-driven thruster", Proc 2nd Int Symp Mar Propulsors, pp.396~403 (2011)
- Yan X, "A review of progress and applications of ship shaft-less rim-driven thrusters", Ocean Eng, 144, pp.142~156 (2017)[DOI]
- Zhang S, "Hydrodynamic performance analysis of hubless rim-driven propulsors", Applied Mechanics and Materials, pp.2565~2568 (2013)[DOI]