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

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Article Type:
Research/Original Article (دارای رتبه معتبر)
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.

Language:
Persian
Published:
Pages:
57 to 72
https://www.magiran.com/p2864861  
سامانه نویسندگان
  • Corresponding Author (2)
    Madjid Abasspour
    (1360) دکترای حرفه‌ای(پزشکی و پیراپزشکی) انرژی و محیط زیست و مهندسی دریا و اقیانوس، Cornell Universsity and MIT
    Abasspour، Madjid
  • Author (5)
    Masoud Torabi Azad
    Full Professor Marine Sciences, Tehran North Branch, Islamic Azad University, Tehran, Iran
    Torabi Azad، Masoud
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