Proposal for the control method of rotational speed to reduce the cavitation of a marine propeller

초록

This paper presents a control method for adjusting propeller rotation speed to reduce cavitation observed on the propeller suction side, attributed to a decrease in flow velocity in the wake field. The primary goal is to decrease the cavity volume while concurrently preventing a reduction in average thrust. Depending on the relationship between inflow velocity, rotational speed, and the angle of attack of the propeller, an increase in the angle of attack of the blades is noted when the inflow velocity decreases. Specifically, back sheet cavitation is predominantly observed in blade positions within the range of -10˚ to 30˚. To address this issue, the paper calculates the rotational speed during one revolution of the propeller based on the estimated inflow velocity corresponding to the propeller’s rotational angle. The rotational speed is expressed as a function of the blade’s rotational angle, and the computed speeds are then applied to computational fluid dynamics simulations to compare and analyze the reduction in cavity volume for improved cavitation reduction performance. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

키워드