Design and off-design performance improvement of a radial-inflow turbine for ORC applications using metamodels and genetic algorithm optimization

Sarmiento, Angie Lizeth Espinosa; Camacho, Ramiro Gustavo Ramírez; Oliveira, Waldir de; Velásquez, Elkin I. Gutiérrez; Murthi, Manohar N.; Gautier, Nelson José Díaz

doi:10.1016/j.applthermaleng.2020.116197

Cited by 32 publications

(7 citation statements)

References 29 publications

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“…In relation to new ways of harnessing energy, Organic Rankine Circle (ORC) cycles are promising where low-temperature sources can be used in generation through the expansion of radial turbines, where optimization methodologies are used in order to increase isentropic efficiency. 43,44 Arispe et al 45 used CFD to parameterize and analyze the performance characteristics of a Francis turbine draft tube based on the GAMM Francis turbine model. The authors developed four different draft tube geometries using a combination of three types of elbow curves.…”

Section: Cfd Study On Turbomachinerymentioning

confidence: 99%

Comparative analysis for distributed generation using ultra‐low head hydro, solar and wind energies

et al. 2021

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Brazil has one of the richest river basins in the world and an energy matrix based mostly on hydroelectric power. Current national policy is increasingly promoting renewable sources like wind power and solar photovoltaic power. Technologies used in generation energy via hydro, wind, and solar sources can be employed in decentralized generation. This study describes a turbine for hydro energetic use in flow sites with heads up to 2.5 (m). A hydrodynamic study was performed using computational fluid dynamics (CFD) analysis to evaluate the performance of this turbine. For this, a three-dimensional model of the turbine was considered, consisting of three computational domains, using periodicity to decrease the computational cost. The variation of the angular velocity and the volumetric flow were the boundary conditions. The turbulence model used was the shear stress transport. The draft tube geometry was modified according to the results of the CFD analysis. The efficiency and performance of the turbine improved from 79% to 80% as a result of this modification. A case study was conducted for a comparative financial analysis of the turbine proposed in this paper, with wind power and solar photovoltaic decentralized generation in Brazil.

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Section: Cfd Study On Turbomachinerymentioning

confidence: 99%

Comparative analysis for distributed generation using ultra‐low head hydro, solar and wind energies

et al. 2021

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“…The radial inflow turbine is a power component that is widely used in the field of OTEC. It has many advantages, such as compact structure, a large single-stage enthalpy drop, a high rotational speed, strong adaptability to variable working conditions with variable guide stator vanes, and a high operating efficiency under small-flow conditions [2][3][4][5]. At present, research achievements made by domestic and foreign scholars on OTEC system radial inflow turbines are gradually increasing.…”

Section: Introductionmentioning

confidence: 99%

Parameter Optimization and Performance Research: Radial Inflow Turbine in Ocean Thermal Energy Conversion

Wang,

Chen,

Xue

et al. 2023

JMSE

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Combining one-dimensional parameter optimization and three-dimensional modeling optimization, a 30 kW radial inflow turbine for ocean thermal energy conversion was designed. In this paper, the effects of blade tip clearance, blade number, twist angle, and wheel–diameter ratio on the radial inflow turbine were analyzed. The results show that the model prediction method based on 3D numerical simulation data can effectively complete secondary optimization of the radial turbine rotor. The prediction model can be used to directly obtain the optimal modeling parameter of the rotor. The tip clearance, blade number, twist angle, wheel–diameter ratio, and shaft efficiency were found to be 0.273 mm, 16, 43.378°, 0.241, and 88.467%, respectively. The optimized shaft efficiency of the turbine was found to be 2.239% higher than the one-dimensional design result, which is of great significance in reducing the system’s power generation costs and promoting the application of this approach in engineering power generation using ocean thermal energy.

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“…However, the cost of radial-inflow turbines will be higher than others. Different researchers have tried to design and use radial-inflow turbines in the ORC [18][19][20][21][22]. The method they used for the design of radial-inflow turbines is called the conventional method.…”

Section: Introductionmentioning

confidence: 99%

Design of Radial-Inflow Turbines for Low-Temperature Organic Rankine Cycle

Zhang

Tang

2023

Machines

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This study presents the development of a design method that has been extended to the design of radial-inflow turbines operating in organic Rankine cycles (ORC). Both the conventional design method and the circulation method available in the literature have been reviewed. The two main limitations of the current circulation method that make it not suitable for the ORC turbine design are the lack of real gas capability and 3D blades with high stresses. Using the circulation method, the flow field is decomposed into a potential part and a rotational part. The mean velocity field and the periodic velocity field are solved separately. To model the thermodynamic properties of the real gas, NIST REFPROP or CoolProp are used. The blade geometry is then solved iteratively by assuming that the velocity vector is parallel to the blade surface. The blade boundary condition is modified to force the blade camber to be radial-fibred, which is helpful to reduce the centrifugal bending stress on the blade. All the formulations are derived step by step, and the numerical treatments, including grid generation, numerical differentiation, computational scheme, and convergence, are discussed in detail. This method is validated by designing a R245fa ORC turbine rotor. The performance of the rotor design is predicted by CFD and FEA simulations, and it is compared to the results using other methodologies in the literature.

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Design and off-design performance improvement of a radial-inflow turbine for ORC applications using metamodels and genetic algorithm optimization

Cited by 32 publications

References 29 publications

Comparative analysis for distributed generation using ultra‐low head hydro, solar and wind energies

Comparative analysis for distributed generation using ultra‐low head hydro, solar and wind energies

Parameter Optimization and Performance Research: Radial Inflow Turbine in Ocean Thermal Energy Conversion

Design of Radial-Inflow Turbines for Low-Temperature Organic Rankine Cycle

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