Abstract
Submerged resonant ducts offer an approach to the design of wave-energy extraction devices consistent with the need for maximum seaworthiness. This paper gives a full account of one type of analysis of these systems, based upon two-dimensional wave hydrodynamics and linearized duct dynamics. The mathematical analyses are given in detail in § 2 while § 1 describes as concisely as possible (i) the assumptions underlying each analysis, (ii) its results and their implications for design, and (iii) any available experimental comparisons.One theoretical prediction, unexpected when it was first made but since confirmed by experiment (Knott & Flower 1979), is that the effective pressure fluctuations to which a resonant duct responds can be substantially greater than those that would be present at the level of the duct mouth if the duct were absent. Other important predictions are concerned with added mass, radiation damping and the conditions for optimum energy extraction, calculated below for a wide variety of mouth design configurations and internal duct geometries. Broad tentative conclusions from the analyses are given at the end of § 1.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference14 articles.
1. Carey, D. J. & Meratla, Z. 1976 Brit. Patent Appl. no. 38490/76, dated 16 September 1976; cognated with Brit. Patent Appl. no. 820/77, dated 10 January 1977.
2. Newman, J. N. 1975 J. Fluid Mech. 71,273.
3. MacDonald, A. D. 1949 J. Math. & Phys. 28,183.
4. Every, M. J. , Priddin, K. G. & Prosser, M. J. 1977 Tests on a Device for Extracting Wave Power. Cranfield, England:BHRA Fluid Engineering.
5. Dean, W. R. 1945 Proc. Camb. Phil. Soc. 41,231.