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Investigating the effect of geometric parameters on hydrodynamic and hydro-acoustic performances of submerged propellers
Razaghian, AH and Ebrahimi, A and Zahedi, F and Javanmardi, MR and Seif, MS, Investigating the effect of geometric parameters on hydrodynamic and hydro-acoustic performances of submerged propellers, Applied Ocean Research, 114 Article 102773. ISSN 0141-1187 (2021) [Refereed Article]
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The hydro-acoustic analysis of submerged propellers is an important issue in marine industries, which is examined to reduce the vibrations and noise level of vessels alongside reducing fuel consumption and improving hydrodynamic efﬁciency. B-series propellers are common propellers whose hydrodynamic and acoustic inves-tigation through applying suitable rake, and skew angle can offer proper results to designers for enhancing the hydrodynamic performance and reducing noise. In this study, a model of the ﬁve-bladed B-series propeller with the normal skew angle is chosen. The effects of geometric parameters, including the rake angle, skew angle, geometric pitch ratio, and the number of blades on the hydrodynamic and acoustic performance of propeller, are numerically investigated under non-cavitating conditions. In the numerical analysis, RANS equations are solved using the ﬁnite volume method through k-ε turbulence modeling, and the hydrodynamic characteristics of the propellers are evaluated at different ﬂow conditions. In addition, the noise of propellers is calculated using FW-H formulation in deﬁned receivers. For validation of the numerical results, the model of propeller is tested in the K23 cavitation tunnel at the Sharif University of Technology. Results show that the numerical results are in good agreement with experimental results and other numerical studies. Moreover, the effects of changes of geometric parameters on the hydrodynamic and acoustic performance of the propeller are investigated. According to the results, the far-ﬁeld can be deﬁned relative to the propellerís radius (R). By increasing the rake angle, geometric pitch ratio, and blade numbers individually, the hydrodynamic efﬁciency decreases in each advance ratio. The overall SPL downstream of the propeller is higher than the rotation plane, and the ﬁve and 7-blade propellers can provide desirable SPL acoustically in this propeller type.
|Item Type:||Refereed Article|
|Keywords:||hydro-acoustic, hydrodynamic, geometric parameters, FW-H equations, sound pressure level|
|Research Group:||Maritime engineering|
|Research Field:||Ship and platform structures (incl. maritime hydrodynamics)|
|Objective Group:||Computer, electronic and communication equipment|
|Objective Field:||Integrated systems|
|UTAS Author:||Javanmardi, MR (Dr Mohammadreza Javanmardi)|
|Web of Science® Times Cited:||5|
|Deposited By:||NC Maritime Engineering and Hydrodynamics|
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