Reduce Contra Rotating Propeller (CRP)Noise Level By Improving Design Specifications

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Kheiri, Ehsan | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 54956 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Abbaspour, Madjid; Shafii, Mohammad Behshad
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 heterogeneous by considering the nonlinear phenomena of sound transmission and elimination of quadrupole sources of noise and the difference in noise propagation can be determined by experimental results. rake angle, skew angle and step ratio studies have been investigated in this study and the effect of each on the noise emitted in front of the hub and the rotating plate has been shown
Keywords:
Sound Pressure Level ; Hydrodynamics ; Hydroacoustic ; Contra-Rotating Propeller ; Ffowcs Williams and Hawkings (FWH)Equation

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