当前位置: X-MOL 学术Renew. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Shape optimisation of the sharp-heeled Kaplan draft tube: Part I - Performance evaluation using Computational Fluid Dynamics
Renewable Energy ( IF 8.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.renene.2020.05.164
S.J. Daniels , A.A.M. Rahat , G.R. Tabor , J.E. Fieldsend , R.M. Everson

Abstract A methodology to assess the performance of an elbow-type draft tube is outlined. This was achieved using Computational Fluid Dynamics (CFD) to evaluate the pressure recovery and mechanical energy losses along a draft tube design, while using open-source and commercial software to parameterise and regenerate the geometry and CFD grid. An initial validation study of the elbow-type draft tube is carried out, focusing on the grid-regeneration methodology, steady-state assumption, and turbulence modelling approach for evaluating the design’s efficiency. The Grid Convergence Index (GCI) technique was used to assess the uncertainty of the pressure recovery to the grid resolution. It was found that estimating the pressure recovery through area-weighted averaging significantly reduced the uncertainty due to the grid. Simultaneously, it was found that this uncertainty fluctuated with the local cross-sectional area along the geometry. Subsequently, a study of the inflow cone and outer-heel designs on the flowfield and pressure recovery was carried out. Catmull-Rom splines were used to parameterise these components, so as to recreate a number of proposed designs from the literature. GCI analysis is also applied to these designs, demonstrating the robustness of the grid-regeneration methodology.

中文翻译:

尖头卡普兰导流管的形状优化:第 I 部分 - 使用计算流体动力学进行性能评估

摘要 概述了一种评估弯管式尾水管性能的方法。这是使用计算流体动力学 (CFD) 来评估沿尾水管设计的压力恢复和机械能损失,同时使用开源和商业软件来参数化和重新生成几何和 CFD 网格来实现的。对弯管式尾水管进行了初步验证研究,重点是用于评估设计效率的网格再生方法、稳态假设和湍流建模方法。网格收敛指数 (GCI) 技术用于评估压力恢复到网格分辨率的不确定性。发现通过面积加权平均估计压力恢复显着降低了由网格引起的不确定性。同时地,发现这种不确定性随着几何形状的局部横截面积而波动。随后,对流场和压力恢复的流入锥和外跟设计进行了研究。Catmull-Rom 样条用于参数化这些组件,以便从文献中重新创建许多提议的设计。GCI 分析也应用于这些设计,证明了电网再生方法的稳健性。
更新日期:2020-11-01
down
wechat
bug