Analysis of Geometric Variation of Three Degrees of Freedom through the Constructal Design Method for a Oscillating Water Column Device with Double Hidropneumatic Chamber

Abstract:

This paper presents a biphasic two-dimensional numerical study of sea wave energy converters with operating principle being Oscillating Water Column (CAO) devices with two couples chambers. For the study of the geometric optimization, the Constructal Design method is applied in association with the exhaustive search method to determine the geometric arrangement that leads to the greatest hydropneumatic power available. The objective function is the maximization of hydropneumatic power converted by the device. The constraints of the problem are the inflow volumes of the hydropneumatic chamber (V_E1, V_E2), the total volumes (V_T1, V_T2) and the thicknesses of the device columns (e₁, e₃). The degrees of freedom analyzed were H₁/L₁ (ratio between height and length of the hydropneumatic chamber of the first device), H₂/L₂ (ratio between height and length of the hydropneumatic chamber of the second device), H₂ (height of the column dividing the two devices) and e₂ (thickness of the column dividing the devices). In the present work the degree of freedom H₆ (depth of immersion of the device) is kept constant and equal to H₆ = 9.86 m. The Finite Volume Method (FVM) was used in the numerical solution of the equations employed. For the treatment of the interaction between the air and water phases, the Volume of Fluid (VOF) method was applied. The results show that the maximum hydropneumatic power available was 5715.2 W obtained for degrees of freedom H₁/L₁ = H₂/L₂ = 0.2613 and e₂ = 2.22 m. The case of lower performance has a power value equal to 4818.5 W with degrees of freedom equal to H₁/L₁ = H₂/L₂ = 0.2613 and e₂ = 0.1 m.

• Periodical: Defect and Diffusion Forum (Volume 396)
• Pages: 22-31
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.396.22
• Online since: August 2019
• Authors: Yuri T.B. Lima*, Mateus das Neves Gomes, Camila F. Cardozo, Liércio André Isoldi, Elizaldo Domingues dos Santos, Luiz Alberto Oliveira Rocha
• Keywords: Constructal Design, Coupled Chambers, Oscillating Water Column (OWC)

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