Study On The Noise Reduction Performance Of Bionic Surface Of Marine Propeller And Its Abrasive Belt Grinding Method

In order to solve the problems of high resistance and cavitation of marine propeller,such as low propulsion efficiency and high noise,this paper takes marine propeller as the research object and bionic noise reduction surface as the starting point,systematically studies the biological characteristic parameters of different types of shark skin surface,and studies the surface morphology of different types of shark skin by numerical simulation Based on the dynamic drag reduction and noise reduction mechanism of characteristic parameters,the bionic surface of propeller with shark skin noise reduction characteristics is formed.According to the service environment of the bionic surface of propeller,the noise performance is analyzed,which provides theoretical and technical support for improving the noise reduction level of marine propeller.The main research contents are as follows:(1)Simulation study on the fluid noise performance of marine propeller.The numerical simulation method is used to analyze the flow field of the common marine propeller under the specified operation state,and the pressure and velocity distribution in the flow field are obtained;then the cavitation performance of the marine propeller is analyzed,and the cavitation state of the marine propeller under the specified operation state is obtained;then the noise of the marine propeller is analyzed and calculated according to the results of the first two steps,The running noise of the common marine propeller in the prescribed state is determined,which provides a comparative object for the study of the noise performance of the propeller with bionic surface.(2)The mechanism of noise reduction on the surface of biological structure and its bionic analysis.In this paper,the micro structure features of the surface of organism with the characteristics of drag reduction and noise reduction under water are extracted,the feature model of the surface of organism is established,and the hydrodynamic analysis of this feature is carried out,and the mechanism of drag reduction and noise reduction of the surface of organism with groove structure is obtained;according to the above analysis,the machined bionic groove surface is established,and the feature table of the bionic groove and the bionic groove is compared and analyzed The parameters of the zigzag bionic groove structure with the performance close to the biological surface are determined by the difference of the drag reduction and noise reduction performance of the surface,which lays a good foundation for the subsequent establishment of the marine propeller with the bionic surface.(3)Study on noise reduction performance of bionic surface of marine propeller.The bionic characteristics are applied to the surface of the propeller blades,and the model of the propeller with bionic groove surface is created.The flow field,cavitation performance and running noise of the bionic propeller are analyzed by numerical simulation method,and the results are compared with those of the ordinary propeller.The ratio of the propeller with bionic groove surface is obtained The results show that the ordinary marine propeller has better noise performance at higher speed.(4)Study on abrasive belt grinding method of propeller bionic noise reduction surface.First of all,the feasibility of the bionic groove on the surface of Ni Al Bronze alloy plate is verified by the experiment of belt grinding method;a belt grinding method which can process the bionic groove feature on the surface of marine propeller is proposed;the belt grinding experiment on the bionic groove surface of a marine propeller is carried out by using this method,and the belt grinding method is verified in the ship The feasibility of using propeller surface to grind the surface of unit bionic groove.