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.

서 론
재료 및 방법
    추진기 설계
    전산유체역학
결과 및 고찰
결 론
사 사
References

• 김형호(경상국립대학교 기계소재융합공학부 부교수) | Hyoung-Ho KIM (Associate Professor, School of Mechanical Material Convergence Engineering, Gyeongsang National University, Gyeongnam 52725, Korea)
• 이창제(한국해양대학교 해사산업연구소 연구교수) | Chang-Je LEE (Research Professor, Institute of Maritime Industry, Korea Maritime and Ocean University, Busan 49112, Korea) Corresponding author