Design and numerical simulation of radial inflow turbine of the regenerative Brayton cycle using supercritical carbon dioxide

Gunawan, Gad; Permana, Diki Ismail; Soetikno, Priyono

doi:10.1016/j.rineng.2023.100931

Cited by 11 publications

(5 citation statements)

References 44 publications

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“…The disk friction losses accurately capture the trend (polynomial of degree 5) computed using the correlations by Daily and Nece 14 and Vranick. 15 It can be concluded by comparing the leakage flow of Figures 6 and 8 that the effect of rotor inlet radius on leakage is more significant than rotational speed. An increase in the rotor inlet radius leads to more entry area (∼2πr2δ) to the backface and higher wall velocity (U2=ωr2).…”

Section: Resultsmentioning

confidence: 91%

“…The variation of disk friction loss is also compared with the disk friction models. 14,15 Equation ( 1) is used to calculate the disk friction of the backface of the rotor. In addition, equation ( 3) is used for the annular sections at the entry and exit of the backface flowpath.…”

Section: Parametric Study Of Backface Flowpathmentioning

confidence: 99%

“…The design and performance of sCO 2 IFR turbines are well-documented in the available literature. [14][15][16][17] These studies essentially focused on the loss mechanisms occurring in the primary flowpath. However, other losses generated due to friction and leakage in the gap between the stationary wall and the rotating backface of the impeller are not evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines

Hoque,

Lanjewar,

Kumar

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Inward flow radial (IFR) supercritical CO2 (sCO2) turbines are smaller in size and operate at considerably higher speeds in comparison to similar capacity conventional gas or steam turbines. The compact size and high speed of IFR turbines result in significant parasitic (leakage and disk friction) losses at the rotor backface. This paper presents CFD investigations to understand the mechanism of parasitic losses of IFR turbines in the kW to MW power scales. The first part of the paper presents a parametric study to quantify the effect of backface flowpath dimensions, rotor inlet radius, and rotational speed on the magnitude of parasitic losses. Subsequently, the paper proposes the implementation of a radial labyrinth seal on the rotor backface to curtail the parasitic losses. The second part of the paper examines how the power scale of the turbine and its design parameters, specific speed and velocity ratio, influence the magnitude of parasitic losses. The investigation reveals that parasitic losses cause an efficiency drop of 8%–15% for 100 kW and 4%–9% for 1 MW IFR sCO2 turbines. In addition, IFR turbines designed for low specific speeds and high velocity ratios result in notably higher parasitic losses, leading to a decline in turbine efficiency. Finally, the paper presents optimal turbine design parameters accounting for the parasitic losses to maximize turbine efficiency.

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Section: Resultsmentioning

confidence: 91%

Section: Parametric Study Of Backface Flowpathmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines

Hoque,

Lanjewar,

Kumar

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Detail modeling is necessary to support the design process and identify the operating conditions of the integrated turbine with the wet gap. The CFD approach is the most appropriate when considering qualitative and quantitative findings and fluid flow device analysis with complicated geometries [12][13][14]. So far, several CFD simulations of water turbines have been performed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Very Low Micro-Hydro Turbine: Design, Simulation and Prototype Experimental

Hermanto¹,

Permana²,

Rusirawan³

et al. 2023

IJHT

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The energy potential of low-head water can be exploited by using the horizontal axial flow to produce rotation in the turbine, which is then converts it into electricity in the generator. The types of blades that are commonly used are propeller types, cross-flow types, and Kaplan types. In this research, a prototype of micro-hydro power plant with a capacity of 20 W will be developed, which utilizes the potential of water flow with a head < 0.5 m. This research begins with observing water flow, including flow characteristics and parameters such as speed, head, and available discharge. The next step is to design the power plant, which includes the design of a very low head horizontal axial turbine, turbine structure and accessories, turbine blade rotor, power transmission system, generator selection, and control system. The manufacture of the main components of the turbine, reservoir, diffuser, etc., is carried out before integrating the entire micro hydropower system. The result shows the physical model of the very low-head turbine prototype produces power at the highest Head (0.4 m) of 11.02 W, while at the same Head, the computational fluid dynamic (CFD) results produce the most significant power with 13.55 W.

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“…In order to improve the actual turbine performance under the conditions of low temperature and pressure, the structural design and optimization of an OTEC radial inflow turbine should be studied. Some researchers have conducted 1D design [12][13][14][15], 3D-CFD simulation [16][17][18] and other analyses. Nithesh et al [19] adopted a comprehensive 1D meanline design method for a radial inflow turbine with a 2 kW output power and found that blade edge filleting is very important to improve blade performance.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Analysis of a 100 kW Radial Turbine for an Ocean Thermal Energy Conversion–Organic Rankine Cycle Power Plant

Feng,

Li,

Huang

et al. 2023

Processes

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In this paper, a 100 kW radial inflow turbine is designed for an ocean thermal energy conversion (OTEC) power plant based on the organic Rankine cycle (ORC) with ammonia as the working fluid. Based on one-dimensional (1D) and three-dimensional computational fluid dynamics (3D-CFD) modeling, the mechanical structure design, static and modal analyses of the turbine and its components are carried out to investigate its mechanical performance. The results show the stress and strain distribution in the volute, stator and rotor, and their maximum values appear, respectively, at the inlet cutout, the tip of the stator outlet and the connection position between the rotor and the shaft. After optimization, all the stresses in the above components are below the allowable values. The frequencies from the first order to the sixth order of the rotor and whole turbine were obtained through modal analysis without prestress and under prestress. The maximum frequency of the rotor and whole turbine is 707.75 Hz and 40.22 Hz, both of which are far away from the resonance frequency range that can avoid resonance. Therefore, the structure of the designed turbine is safe, feasible and reliable so as to better guide actual production.

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Design and numerical simulation of radial inflow turbine of the regenerative Brayton cycle using supercritical carbon dioxide

Cited by 11 publications

References 44 publications

Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines

Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines

Investigation of Very Low Micro-Hydro Turbine: Design, Simulation and Prototype Experimental

Structural Design and Analysis of a 100 kW Radial Turbine for an Ocean Thermal Energy Conversion–Organic Rankine Cycle Power Plant

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Design and numerical simulation of radial inflow turbine of the regenerative Brayton cycle using supercritical carbon dioxide

Cited by 11 publications

References 44 publications

Effect of parasitic losses on the design optimization of inward flow radial supercritical CO2 turbines

Effect of parasitic losses on the design optimization of inward flow radial supercritical CO2 turbines

Investigation of Very Low Micro-Hydro Turbine: Design, Simulation and Prototype Experimental

Structural Design and Analysis of a 100 kW Radial Turbine for an Ocean Thermal Energy Conversion–Organic Rankine Cycle Power Plant

Contact Info

Product

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Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines

Effect of parasitic losses on the design optimization of inward flow radial supercritical CO₂ turbines