A new similarity method for turbomachinery with different working media

Zou, Zhengping; Ding, Chao

doi:10.1016/j.applthermaleng.2018.01.034

Cited by 17 publications

(10 citation statements)

References 26 publications

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“…Similarity has been widely applied to the development of gas turbine engines, in particular for the extrapolation of the information gathered in low-speed testing of blade cascades (or even stages) to the particular set of operating conditions that would be encountered in the actual engine (including the working fluid) [19][20][21].…”

Section: Blade Cascade Aerodynamic Performancementioning

confidence: 99%

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Impact of Fluid Substitution on the Performance of an Axial Compressor Blade Cascade Working with Supercritical Carbon Dioxide

Tello

Reyes

Sánchez

et al. 2019

Journal of Engineering for Gas Turbines and Power

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Recent research on turbomachinery design and analysis for supercritical carbon dioxide (sCO2) power cycles has relied on computational fluid dynamics. This has produced a large number of works whose approach is mostly case-specific, rather than of general application to sCO2 turbomachinery design. As opposed to such approach, this work explores the aerodynamic performance of compressor blade cascades operating on air and supercritical CO2 with the main objective to evaluate the usual aerodynamic parameters of the cascade for variable boundary conditions and geometries, enabling “full” or “partial” similarity. The results present both the global performance of the cascades and certain features of the local flow (trailing edge and wake). The discussion also highlights the mechanical limitations of the analysis (forces exerted on the blades), which is the main restriction for applying similarity laws to extrapolate the experience gained through decades of work on air turbomachinery to the new working fluid. This approach is a step toward the understanding and appropriate formulation of a multi-objective optimization problem for the design of such turbomachinery components where sCO2 is used as the operating fluid. With this objective, the paper aims to identify and analyze what would be expected if a common description of such computational design problems similar to those where air is the working fluid were used.

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Section: Blade Cascade Aerodynamic Performancementioning

confidence: 99%

“…Nevertheless, when the working fluid is not an ideal gas or if the actual differences between the two 'similar' designs are very far from one another, applying similarity rules might lead to non-negligible errors. Moreover, it might even be the case that full similarity cannot be enforced/achieved [21].…”

Section: Blade Cascade Aerodynamic Performancementioning

confidence: 99%

Impact of Fluid Substitution on the Performance of an Axial Compressor Blade Cascade Working with Supercritical Carbon Dioxide

Tello

Reyes

Sánchez

et al. 2019

Journal of Engineering for Gas Turbines and Power

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“…In condition that the fluid properties are changed, some researchers have studied the similitude method between different ideal gas compressors. There are several ways to deduced the similarity criteria, including dimensional analysis (Roberts and Sjolander, 2005;Chen et al, 2019b), kinematic similarity derivation (Zou and Ding, 2018) and differential equation method (Zhu et al, 2008). However, when it comes to the nearcritical CO 2 , the ideal gas assumption can not be satisfied, so the above methods are no longer applicable.…”

Section: Introductionmentioning

confidence: 99%

A study of real-gas effect on SCO2 compressor performance using similitude method

Zou

2022

J. Glob. Power Propuls. Soc.

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The drastic property changes of supercritical CO2 (SCO2) make the performance of SCO2 compressors different from that of conventional compressors. This study deals with the real-gas effect on the SCO2 compressor performance by theoretical analysis and numerical validation. A set of similitude parameters are firstly deduced by dimensional analysis. Then keeping these parameters unchanged, the performance variation of a SCO2 compressor is analyzed when the inlet flow condition changes in a certain temperature and pressure range. Results show that the proposed similitude method could accurately reflect the variation trend of SCO2 compressor performance under different inflow conditions. The real-gas effect enables the compressor to obtain higher pressure ratio with lower temperature rise. It is recommended that the inlet temperature of SCO2 compressor should be as close as possible to the critical temperature and the pressure should be about 150 kPa higher than the corresponding pseudo-critical pressure at the same temperature.

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“…In condition that the fluid properties are changed, some researchers have studied the similarity method between different ideal gas compressors. There are several ways to deduced the similarity criteria, including dimensional analysis (Chen, Zou and Fu, 2019;Roberts and Sjolander, 2005), kinematic similarity derivation (Zou and Ding, 2018) and differential equation method (Zhu et al, 2008). However, when it comes to the near-critical CO 2 , the ideal gas assumption can not be satisfied, so the above methods are no longer applicable.…”

Section: Introductionmentioning

confidence: 99%

A study of real gas effect on SCO2 compressor performance using similarity method

Xu¹,

Zou²

2022

Proceedings of Global Power &Amp; Propulsion Society

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The drastic property changes of supercritical CO2 (SCO2) make the performance of SCO2 compressor different from that of conventional compressor. This study deals with the real gas effect on SCO2 compressor performance by theoretical analysis and numerical validation. A set of similarity parameters are firstly deduced by dimensional analysis. Then keeping these parameters unchanged, the performance variation of SCO2 compressor is analyzed when the inlet flow condition changes in a certain temperature and pressure range. Results show that the proposed similarity method could accurately reflect the variation trend of SCO2 compressor performance under different inflow conditions. The real gas effect enables the compressor to obtain higher pressure ratio with lower temperature rise. It is recommended that the inlet temperature of SCO2 compressor should be as close as possible to the critical temperature and the pressure should be as close as possible to the corresponding pseudo critical point pressure at the same temperature.

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A new similarity method for turbomachinery with different working media

Cited by 17 publications

References 26 publications

Impact of Fluid Substitution on the Performance of an Axial Compressor Blade Cascade Working with Supercritical Carbon Dioxide

Impact of Fluid Substitution on the Performance of an Axial Compressor Blade Cascade Working with Supercritical Carbon Dioxide

A study of real-gas effect on SCO<sub>2</sub> compressor performance using similitude method

A study of real gas effect on SCO2 compressor performance using similarity method

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