Development of a sound radiation model for a finite-length duct of arbitrary shape

AIAA Journal ◽  
1982 ◽  
Vol 20 (12) ◽  
pp. 1687-1692 ◽  
Author(s):  
M. A. Hamdi ◽  
J. M. Ville
Keyword(s):  
Finite Length ◽  
Arbitrary Shape ◽  
Sound Radiation ◽  
Radiation Model

Study on Applicability of Sound Radiation Characteristics of Thin Finite Length Cylindrical Shells Using Wave Propagation Approach

2012 ◽  
Vol 190-191 ◽  
pp. 1325-1330 ◽  
Author(s):  
Bing Ru Li ◽  
Xuan Yin Wang ◽  
Hui Liang Ge ◽  
Yue Peng Jiang
Keyword(s):  
Wave Propagation ◽  
Boundary Conditions ◽  
Finite Length ◽  
Cylindrical Shells ◽  
Great Influence ◽  
Sound Radiation ◽  
Radiation Characteristics ◽  
Stiffened Shells ◽  
Wave Propagation Method ◽  
Mode Truncation

Based on Donnell’s thin shell theory and basic equations, the wave propagation method is discussed here in detail, which is used to investigate the vibration and sound radiation characteristics of thin finite length circular cylindrical shells and ring stiffened shells under various boundary conditions. The effects of boundary conditions, mode truncation, shell’s length, thickness and rings on the acoustic radiation are explored. It is shown that the wave propagation method is more effective for the long cylindrical shell, and the mode truncation can satisfy the calculation accuracy. The conclusion is drawn that the stiffeners have a great influence on the total mechanical impedance while have a slight influence on radiation impedance. The work will give some guidelines for noise reduction of this kind of shell.

Linearized Potential Flow Models for Hydrofoils in Supercavitating Flows

1971 ◽  
Vol 93 (4) ◽  
pp. 550-564 ◽  
Author(s):  
Tetsuo Nishiyama ◽  
Terukazu Ota
Keyword(s):  
Finite Length ◽  
Potential Flow ◽  
Arbitrary Shape ◽  
Cavitating Flow ◽  
Experimental Results ◽  
Flow Models ◽  
Cavity Closure ◽  
The One

A number of linearized models of fully cavitating flow about hydrofoils are investigated. Specifically, the cavity closure and wake behind the closure are examined and their effects on the characteristics of a symmetrical wedge, a base-vented hydrofoil, and a supercavitating hydrofoil of arbitrary shape are considered. By comparing theoretical and experimental results, the suitability of various flow models is examined and the one which gives the best results is explored in detail. A method based on the later model for calculating the characteristics of a hydrofoil with a cavity of finite length is presented.

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