Analisis Performa Controllable Pitch Propeller ZF-KH680 pada Kapal AHTS 58,7 meter dengan Metode Computational Fluid Dynamics (CFD)

Abstract

AHTS vessels require an efficient propulsion system for complex operations. This study focuses on the performance analysis of a CPP on a 58,7 m AHTS vessel that failed to achieve its design speed during sea trials. The objective of this research is to analyze the propeller characteristics through 3D modeling, CFD simulations, and to compare the calculated speed with the sea trial results. The research methodology involves the development of a 3D CPP model validated against blade area data. CFD simulations were conducted to determine thrust and torque at various pitch settings ranging from 60% to 100%. Subsequently, engine– propeller matching calculations were performed, and the empirically calculated ship speeds were compared with sea trial results. The 3D CPP model validation against blade area data yielded an error of 2,141%. The simulation results show that increasing the pitch consistently increases thrust and torque. At J 0,2, a 60% pitch produced a thrust of 80146,335N and torque of 28710,812Nm, at 70% pitch thrust was 101320,310N and torque 39289,549Nm, at 80% pitch thrust was 121873,870N and torque 51500,903Nm, at 90% pitch thrust was 142205,420N and torque 65526,231Nm, and at 100% pitch thrust reached 162626,210N with torque 81493,923Nm. A significant discrepancy was found between the empirically calculated speed and the sea trial results. Based on the empirical calculations, the ship’s service speed at 60% to 100% pitch reached 9,09 knots, 10,03 knots, 10,99 knots, 11,99 knots, and 12,96 knots, respectively. In contrast, the recorded sea trial speeds at 60% to 100% pitch were only 6,7 knots, 7,3 knots, 7,9 knots, 8,8 knots, and 9,10 knots.