Application Analysis of the MAS's 40 m Patrol Ship Propeller Designed by the Theoretical Method

A new propeller is designed in this paper for MAS's 40 m patrol ships.Particularly,the lifting-line and lifting-surface design method as well as the panel method are employed,and the given circulation distribution is adopted during the propeller theoretical design.For validation,both open water model tests and real ship tests were conducted.The ship tests were performed on two ships of the same type,yet one ship was equipped with an atlas designed propeller,while the other was equipped with the theoretical designed propeller.The parameters of speed,shaft power and aft vibration were compared and analyzed between the two models.It is observed that compared with the atlas designed propeller,the one designed by the theoretical method has a closer match with the ship,which is more efficient in propelling(with an increase of approximately 2% in the real ship propeller efficiency)and superior in noise reduction(with a decrease of about 5 dB in hull aft vibration).Therefore,the feasibility and reliability of the proposed design method in practical applications are successfully proved.