Hydrophysics

Hydrophysics

The effect of duct cross-section on the reduction of noise produced by marine propellers using numerical and laboratory methods

Document Type : Original Article

Authors
1 PhD student of Physical Oceanography, North Tehran Branch Islamic Azad University, Tehran , Iran
2 Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
3 Associate professor of of Physical Oceanography Department, North Tehran Branch. Islamic Azad University, Tehran, Iran
4 Professor of Physical Oceanography Department, North Tehran Branch,. Islamic Azad University, Tehran, Iran
Abstract
Ship noise emission has many environmental impacts and its reduction can reduce or eliminate some of these harmful effects. Hence, recognizing noise-generating source and investigating noise reduction techniques is the first step in eliminating these harmful effects. Studies show that ship propeller is one of the main commercial ship noise-generating sources. The duct placement around the propeller is one of the well-known solutions for reduction noise eliminated from marine propeller. In this paper, we first investigate mathematical equations of noise emission in far field. In the following, a basic geometry was introduced for ducted propeller and necessary numerical calculations were done to estimate SPL at a certain distance from the propeller (by using FWH equations). The measured SPL emitted from the propeller in CFD approach (solving the FWH) shows 28% reduction for ducted propeller in comparison with the propeller without the duct. In experimental approach (after removing the ambient noise) shows 37% reduction for ducted propeller in comparison with the propeller without the duct.
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Volume 9, Issue 2 - Serial Number 17
February 2024
Pages 57-72

  • Receive Date 18 October 2024
  • Revise Date 26 November 2024
  • Accept Date 01 December 2024