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基于计算流体动力学的导管式水动力涡轮机设计优化

CFD-based design optimization of ducted hydrokinetic turbines.

作者信息

Park Jeongbin, Knight Bradford G, Liao Yingqian, Mangano Marco, Pacini Bernardo, Maki Kevin J, Martins Joaquim R R A, Sun Jing, Pan Yulin

机构信息

Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.

Ocean Engineering, University of Rhode Island, Narragansett, RI, 02882, USA.

出版信息

Sci Rep. 2023 Oct 20;13(1):17968. doi: 10.1038/s41598-023-43724-4.

DOI:10.1038/s41598-023-43724-4
PMID:37864063
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10589359/
Abstract

Hydrokinetic turbines extract kinetic energy from moving water to generate renewable electricity, thus contributing to sustainable energy production and reducing reliance on fossil fuels. It has been hypothesized that a duct can accelerate and condition the fluid flow passing the turbine blades, improving the overall energy extraction efficiency. However, no substantial evidence has been provided so far for hydrokinetic turbines. To investigate this problem, we perform a CFD-based optimization study with a blade-resolved Reynolds-averaged Navier-Stokes (RANS) solver to explore the design of a ducted hydrokinetic turbine that maximizes the efficiency of energy extraction. A gradient-based optimization approach is utilized to effectively deal with the high-dimensional design space of the blade and duct geometry, with gradients being calculated through the adjoint method. The final design is re-evaluated through higher-fidelity unsteady RANS (URANS) simulations. Our optimized ducted turbine achieves an efficiency of about 54% over a range of operating conditions, higher than the typical 46% efficiency of unducted turbines.

摘要

水动力涡轮机从流动的水中提取动能以产生可再生电力，从而有助于可持续能源生产并减少对化石燃料的依赖。据推测，管道可以加速并调节通过涡轮叶片的流体流动，提高整体能量提取效率。然而，到目前为止，尚未为水动力涡轮机提供实质性证据。为了研究这个问题，我们使用基于计算流体力学（CFD）的优化研究，采用叶片解析雷诺平均纳维-斯托克斯（RANS）求解器来探索一种管道式水动力涡轮机的设计，以最大限度地提高能量提取效率。采用基于梯度的优化方法来有效处理叶片和管道几何形状的高维设计空间，通过伴随方法计算梯度。最终设计通过更高保真度的非定常RANS（URANS）模拟进行重新评估。我们优化后的管道式涡轮机在一系列运行条件下实现了约54%的效率，高于无管道涡轮机通常46%的效率。

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