Loading...
Search for:
hydroacoustic
0.101 seconds
Reduce Contra Rotating Propeller (CRP)Noise Level By Improving Design Specifications
, M.Sc. Thesis Sharif University of Technology ; Abbaspour, Madjid (Supervisor) ; Shafii, Mohammad Behshad (Co-Supervisor)
Abstract
One of the biggest problems in improving the performance of submersible propellers is the acoustic standard in conventional propellers. Recently, new solutions in propellers geometry have been used to reduce non-cavitation noise. Designing CRP licenses is one of these methods. This research includes numerical analysis. Numerical analysis in this research solves RANS equations of flow and extraction of hydrodynamic parameters and impeller noise in Ansys software. The results of numerical hydrodynamic solution are validated by laboratory results.DTMB 4119 three-blade propeller is used for hydrodynamic and hydroacoustic validation. The solution of Lighthill equations by FW-H method is...
Study The Effect of Geometric Parameter on Hydrodynamic and Hydroacoustic Performance Marine Propeller in Far Field by the Openwater Method
, M.Sc. Thesis Sharif University of Technology ; Seif, Mohammad Saeed (Supervisor) ; Mehdigholi, Hamid (Co-Supervisor)
Abstract
One of the most important noise produced by craft, is the propeller noise which must be identified and measured for many reasons, including military and engineering applications. Therefore, in the first step, the sources of noise emissions in the propeller are studied, and after describing the research background, the governing equations of this research are examined. Then, to validate, the DTMB 4119 propeller, which has hydrodynamic and hydroacoustic results, is used. In order to carry out the investigations, a B series propeller model is selected and compared with changing the parameters of the Rake, Skew, Pitch ratio and the number of blades for their hydrodynamic and hydroacoustic...