Modelling and parametric analysis of small-scale axial and radial-outflow turbines for Organic Rankine Cycle applications

Jubori, Ayad M. Al; Al-Dadah, Raya; Mahmoud, Saad; Daabo, Ahmed M.

doi:10.1016/j.apenergy.2016.12.169

Cited by 50 publications

(14 citation statements)

References 38 publications

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“…The definitions of the nozzle enthalpy loss coefficient (ξ N ) and rotor enthalpy loss coefficient (ξ R ) of a radial outflow turbine are as shown in Equations (9) and (10), respectively [23]. The total-to-total efficiency (η tt ) and total-to-static efficiency (η ts ) of the turbine can be expressed by using the enthalpy loss coefficients shown in Equations (11) and (12) [20,22].…”

Section: Basic Theorymentioning

confidence: 99%

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Preliminary Design and Off-Design Analysis of a Radial Outflow Turbine for Organic Rankine Cycles

Kim

2020

Energies

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Recently, the advantages of radial outflow turbines have been outstanding in various operating conditions of the organic Rankine cycle. However, there are only a few studies of such turbines, and information on the design procedure is insufficient. The main purpose of this study is to provide more detailed information on the design methodology of the turbine. In this paper, a preliminary design program of a radial outflow turbine for organic Rankine cycles was developed. The program determines the main specifications of the turbine through iterative calculations using the enthalpy loss model and deviation angle model. For reliability evaluation of the developed algorithm, a 400.0 kW turbine for R143a was designed. The designed turbine was validated through computational fluid dynamics. As a result, the accuracy of the program was about 95% based on the turbine power, which shows that it is reliable. In addition, the turbine target performance could be achieved by fine-tuning the blade angle of the nozzle exit. In addition, performance evaluation of the turbine against off-design conditions was performed. Ranges of velocity ratio, loading coefficient, and flow coefficient that can expect high efficiency were proposed through the off-design analysis of the turbine.

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Section: Basic Theorymentioning

confidence: 99%

“…The studies suggested alternatives to multi-stage turbines in response to cycles requiring high pressure ratios. Al Jubori et al [20] studied an axial turbine and a radial outflow turbine for the organic Rankine cycle. The performance of each turbine was compared through CFD, but the difference was insignificant.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Design and Off-Design Analysis of a Radial Outflow Turbine for Organic Rankine Cycles

Kim

2020

Energies

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“…Al Jubori et al [20,21] presented the mathematical approach combined mean line design and 3D Computational Flow Dynamics (CFD) analysis for organic Rankine cycle turbines. The results revealed that the radial outflow turbine configuration exhibited a considerably higher turbine performance, with the overall isentropic efficiency of 82.9% and power output of 14.331 kW.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Design and Optimization Approach for Radial Inflow Turbines—Part I: Automated Preliminary Design

Deng

Shao²,

et al. 2018

Applied Sciences

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An integrated design and optimization approach was developed for radial inflow turbines, which consists of two modules, an automated preliminary design module, and a flexible three-dimensional multidisciplinary optimization module. In this paper, the first module about the automated preliminary design approach was presented in detail and validated by the experimental data. The approach employs a genetic algorithm to explore the design space defined by the loading coefficient, flow coefficient, and rotational speed. The aim is to obtain the best design scheme with high aerodynamic performance under specified constraints and to reduce the dependency on human experiences when designing a radial inflow turbine. The validation results show that the present approach is able to get the optimal design and alleviate the dependence on the designer’s expertise under specified constraints at the preliminary design stage. Furthermore, the optimization results indicate that using the present optimization approach the total-to-static efficiency of the optimized T-100 radial inflow turbine can be increased by 1.0% under design condition and the rotor weight can be decreased by 0.35 kg (26.7%) as compared with that of the original case.

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“…Then the exergy distribution of the cycle was obtained through exergy analysis. Al Jubori et al 26 presented a calculation model to develop axial and radial turbines with five organic mediums. The optimization objects mainly include the net power and size properties.…”

mentioning

confidence: 99%

“…Also, many design models of ORC turbines have been proposed in the literatures. Al Jubori et al 26 presented a calculation model to develop axial and radial turbines with five organic mediums. Xia et al 27 conducted 1D design and 3D computational fluid dynamics (CFD) performance analysis for the ORC turbine and studied the impact of splitter blade.…”

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confidence: 99%

Improved thermodynamic and aerodynamic design method and off‐design performance analysis of a radial inflow turbine for ORC system

Han

Jia

2019

Int J Energy Res

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Summary Radial inflow turbine is one of the crucial components of organic Rankine cycle (ORC) system, which has great impact on the performance of system. R245fa was selected as the working fluid to recycle the waste heat source with a temperature of 350 to 400 K. The genetic algorithm (GA) was employed in thermodynamic design to optimize the 10 key design parameters, which are needed in aerodynamic design of the ORC turbine. Isotropic efficiency was the fitness function of 10 key variables in GA. The three‐dimensional geometry model was built based on the thermodynamic and aerodynamic design and then was imported into the commercial software ANSYS‐CFX to conduct viscous numerical simulation. Based on the three‐dimensional simulation, the off‐design performance in different mass flow rate, static inlet temperature coupled with different rotational speed was investigated respectively. The results show that at design condition, the maximum efficiency deviation is only 2.5% with the rotational speed variations among the range of 10%, so the radial inflow turbine designed in this research possesses great off‐design performance.

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Modelling and parametric analysis of small-scale axial and radial-outflow turbines for Organic Rankine Cycle applications

Cited by 50 publications

References 38 publications

Preliminary Design and Off-Design Analysis of a Radial Outflow Turbine for Organic Rankine Cycles

Preliminary Design and Off-Design Analysis of a Radial Outflow Turbine for Organic Rankine Cycles

An Integrated Design and Optimization Approach for Radial Inflow Turbines—Part I: Automated Preliminary Design

Improved thermodynamic and aerodynamic design method and off‐design performance analysis of a radial inflow turbine for ORC system

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