A study on the similarity method for helium compressors

Chen, Yiming; Zou, Zhengping; Fu, Chao

doi:10.1016/j.ast.2019.04.026

Cited by 15 publications

(8 citation statements)

References 16 publications

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“…However, no matter for the similarity between the real gas and the ideal gas compressor, or for the similarity between the real gas compressors with different inlet conditions, it is impossible to ensure that all physical parameters are equal. Therefore, refer to Chen's work (Chen et al, 2019b), we derived a set of new similitude parameters to achieve approximate similarity by combining those nondimensional parameters and fluid property parameters. The forms are as follows:…”

Section: Dimensional Analysismentioning

confidence: 99%

“…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when it comes to the nearcritical CO 2 , the ideal gas assumption can not be satisfied, so the above methods are no longer applicable.…”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%

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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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Section: Dimensional Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zou

2022

J. Glob. Power Propuls. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, no matter for the similarity between the real gas and the ideal gas compressor, or for the similarity between the real gas compressors with different inlet conditions, it is impossible to ensure that all physical parameters are equal. Therefore, refer to Chen's work (Chen, Zou and Fu, 2019), we derived a set of new similarity parameters to achieve approximate similarity by combining those nondimensional parameters and fluid property parameters. The forms are as follows:…”

Section: Dimensional Analysismentioning

confidence: 99%

“…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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“…Similitude theory has been widely used in structural dynamics and fluid dynamics [25][26][27] to establish the scaling laws for predicting the physical behaviors of a full-scale prototype from a scale down model. Similitude theory has a wide range of applications on beams, [28][29][30][31] plates, [32][33][34][35][36][37][38][39][40] and cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Structural similitude for a scaled rotor system considering stiffness characteristics of bolted joints

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Rotor system with bolted joints is widely used in aero-engine, and has the features of large axial span, high-degrees of freedom, and nonlinearity. There exist several researches on similitude of rotor systems, but these studies mainly focus on the simple and linear systems. The similitude investigation for the rotor system considering bolted joints has not been conducted. To fill this gap, a method to obtain the scaling laws for low-pressure (LP) compressor are presented based on the generalized and fundamental equations of substructures (bolted joint, shaft, and disk), which considers the nonlinearity of bolted joints and different materials. The dynamic model of the LP compressor considering the nonlinearity produced by bolted joints is established. Moreover, the effect of bolted joints on the LP compressor is investigated to illustrate the necessity for considering bolted joints in similitude procedure. In order to ensure the similitude of nonlinear dynamic characteristics, the scaling factors are divided into the linear and nonlinear scaling factors, where the nonlinear scaling factors are used to put the bolted joint into similitude. The results show that the natural frequencies, vibration responses, frequency components, and stability can be predicted accurately by scaled models, even the models are made of relatively cheap materials.

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A study on the similarity method for helium compressors

Cited by 15 publications

References 16 publications

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

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

Structural similitude for a scaled rotor system considering stiffness characteristics of bolted joints

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