Preliminary design and CFD analysis of a radial inflow turbine and the turbine seal for an organic Rankine cycle using zeotropic mixture

Xia, Jiaxi; Zhou, Kehan; Guo, Yumin; Lou, Juwei; Dai, Yiping

doi:10.1016/j.enconman.2020.112647

Cited by 11 publications

(2 citation statements)

References 30 publications

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“…So far, most of previous experimental studies 1,25–29 on turbocharger turbines were done with test facilities based on a wave generator under either hot or cold air transient flow conditions. As well, the working gas of turbocharger turbines is usually approximated as air in the computational procedure during the simulation stage, as many previous research works 10,23,30–35 have done. Although that these simulation models were validated against test data, their accuracy may be further improved as the thermodynamic properties of the actual products of the combustion from gasoline and diesel engines are being taken into account.…”

Section: Introductionmentioning

confidence: 99%

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Ketata

Driss

2022

International Journal of Engine Research

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The turbine, an enabling component of turbochargers, is a seat of highly complex unsteady flow as well as varying gas compositions between diesel and gasoline engines. Thus, it is necessary to take into account different physical models when simulating such turbines. Researchers have often considered the turbine working gas as air, which may not lead to an accurate prediction of actual turbine characteristics. In the present work, the effect of the working gas on the performance of turbocharger turbines as well as on the turbo lag was investigated through a set of numerical simulations for six wastegate opening degrees from 0% up to 100% and under a wide range of the flow pulse frequency ranging from 33.33 up to 166.66 Hz. Four working fluids were involved in this study which are the gasoline burnt gas, diesel burnt gas, air with like gasoline engine waves, and air with like diesel engine waves. The performance of the turbine and its responsiveness quantified as the time lag with burnt gases from both diesel and gasoline engines were compared to those with air. Results showed totally deviated unsteady performance characteristics compared to the turbine working with air. Results also confirmed that considering the working fluid as air may not lead to a fair representation of the actual turbine performance characteristics. The findings of this work put emphasis on the importance of the gas composition when modeling such turbines by engineers especially during the design process where a good turbocharger-engine match has to be met.

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Section: Introductionmentioning

confidence: 99%

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Ketata

Driss

2022

International Journal of Engine Research

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“…The design of the cavity on the impeller back was studied to balance the axial force of a SCO 2 turbine by Ma 30 but there are no discussions about the performance of impeller back seal. Xia 31 analyzed the performance of a self-designed helical groove seal, but he did not investigate the influence on flow characteristics in turbine cascade.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the performance of impeller back seal configuration in a supercritical CO₂ radial-inflow turbine

Wang

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Radial-inflow turbine is a core component in supercritical CO2 (SCO2) Brayton cycle. The leakage from the nozzle outlet towards the impeller back brings a great challenge to the efficiency and security of the power system. In this paper, the labyrinth seal (LS) and dry gas seal (DGS) are arranged on the impeller back of a SCO2 radial-inflow turbine and the influence on the comprehensive performance is investigated. Results demonstrate that both LS and DGS configurations can significantly reduce leakage of the impeller back and DGS configuration performs better. Compared with the configuration without leakage, the power and efficiency of DGS configuration are only reduced by 0.27% and 0.35% respectively. The seal clearance and the inlet width have a greater effect on LS configuration. The thermo-mechanical seal deformation values of DGS configurations are all less than 8 μm, which verifies the feasibility. Finally, a novel combined seal configuration with both LS and DGS is proposed and excellent performance is achieved, providing a potential approach for the sealing problem of SCO2 radial-inflow turbine.

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Design and optimization of a radial-axial two-stage coaxial turbine for high-temperature supercritical organic Rankine cycle

Zhao

Quan

et al. 2023

Applied Thermal Engineering

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Preliminary design and CFD analysis of a radial inflow turbine and the turbine seal for an organic Rankine cycle using zeotropic mixture

Cited by 11 publications

References 30 publications

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Numerical investigation on the performance of impeller back seal configuration in a supercritical CO₂ radial-inflow turbine

Design and optimization of a radial-axial two-stage coaxial turbine for high-temperature supercritical organic Rankine cycle

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Preliminary design and CFD analysis of a radial inflow turbine and the turbine seal for an organic Rankine cycle using zeotropic mixture

Cited by 11 publications

References 30 publications

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Analysis of performance and time lag of turbocharger turbines fed with gasoline and diesel burnt gases and air under pulsating flow conditions

Numerical investigation on the performance of impeller back seal configuration in a supercritical CO2 radial-inflow turbine

Design and optimization of a radial-axial two-stage coaxial turbine for high-temperature supercritical organic Rankine cycle

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Numerical investigation on the performance of impeller back seal configuration in a supercritical CO₂ radial-inflow turbine