Optimization of hydraulic machinery by exploiting previous successful designs

Kyriacou, Stylianos; Weissenberger, S; Grafenberger, P; Giannakoglou, Kyriakos C.

doi:10.1088/1755-1315/12/1/012031

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…The presented parametrization benefit is a low number of parameters, but it provides only limited options for varying the shape of profiles. More complex blade parametrization was presented by Kantor [22] using individual profile points or Kyriacou [23] using Bezier curves.…”

Section: Cfd Analysismentioning

confidence: 99%

Variable-Speed Propeller Turbine for Small Hydropower Applications

et al. 2023

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Standard technical solutions are not cost-effective for many small hydropower sites. This study aims to demonstrate the workflow for the tailor-made variable-speed axial propeller turbine and provide proof of this concept. The turbine is designed to meet the site’s specific space limitations and operating range needs. The runner shape is adjusted to the variable-speed operation and defined hydraulic profile using a parametric geometry model and CFD-based optimization. The variable-speed propeller turbine shows excellent flow control while keeping the mechanical design simple. The tailor-made approach minimizes construction costs using existing structures and is highly suitable for mini-hydropower applications. The prototype—an atypical turbine designed for highly restricted space and installed on-site—serves as proof of the concept. The findings on the design of axial variable-speed turbines are presented.

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Section: Cfd Analysismentioning

confidence: 99%

Variable-Speed Propeller Turbine for Small Hydropower Applications

et al. 2023

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The continuous adjoint method for the design of hydraulic turbomachines

Papoutsis‐Kiachagias

Kyriacou

Giannakoglou

2014

Computer Methods in Applied Mechanics and Engineering

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Coupled Multipoint Shape Optimization of Runner and Draft Tube of Hydraulic Turbines

Lyutov

Чирков

Skorospelov

et al. 2015

Journal of Fluids Engineering

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This paper suggests a method of simultaneous multi-objective shape optimization of hydraulic turbine runner and draft tube (DT) with the objective to increase turbine efficiency in wide range of operating points (OPs). Runner and DT are the main sources of energy losses in hydraulic turbines. Coupling runner and DT in computational fluid dynamics (CFD) analysis enables correct statement of boundary conditions for efficiency evaluation, while simultaneous variation of these components allows more flexible adjustment of flow passage geometry. Detailed runner parameterization with 28 free geometrical parameters and DT parameterization with nine free parameters are given. Optimization problem is solved using multi-objective genetic algorithm (MOGA). For each variation of runner and DT shapes, flow field in wicket gate (WG), runner, and DT is simulated using steady-state Reynolds-Averaged Navier–Stokes (RANS) equations with k-e turbulence model. Energy-based boundary conditions are used for the calculations, allowing determination of efficiency of the whole turbine in correspondence with International Electrotechnical Commission (IEC) standard. Formulations of multiple OP efficiency objective functions and constraints are discussed in detail. To demonstrate the advantages of simultaneous runner and DT variation, two optimization problems are solved for a medium specific speed Francis turbine. Namely, single runner and coupled “runner–DT” optimizations are carried out. It is shown that optimized runner–DT geometry outperforms the result of single runner optimization by about 0.3% in terms of average efficiency, showing the potential of the developed approach to improve multiregime turbine characteristics in practical design optimization problems.

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Optimization of hydraulic machinery by exploiting previous successful designs

Cited by 3 publications

References 4 publications

Variable-Speed Propeller Turbine for Small Hydropower Applications

Variable-Speed Propeller Turbine for Small Hydropower Applications

The continuous adjoint method for the design of hydraulic turbomachines

Coupled Multipoint Shape Optimization of Runner and Draft Tube of Hydraulic Turbines

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