A new methodology for preliminary design of centrifugal impellers with prewhirl

Li, Xiaojian; Zhao, Yijia; Liu, Zhengxian; Chen, Hua

doi:10.1177/0957650919864193

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…There are several proposals for each in relevant literature and some of them are summarised in Table 3. Additionally, Li et al (2020) conclude that when Mach number increases, the optimum inlet flow angle is more tangential and for gases with γ between 1.2...1.4, the flow should be 1-2 • more tangential at the inlet.…”

Section: The Studied Heat Pump Process and Working Fluidsmentioning

confidence: 91%

Design considerations for high-temperature heat pump centrifugal compressors

Jaatinen-Värri,

Tiainen,

Honkatukia

et al. 2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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Centrifugal compressors are generally considered as good options for industrial-scale high-temperature heat pumps with temperature lifts exceeding those currently commercially available. The present paper studies how the evaporating temperature affects the key compressor inlet design parameters which heavily relate to the impeller design and compressor performance. The results indicate that, for a fixed heat pump temperature lift, the rate of change of these parameters increases when the evaporating temperature increases.

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Section: The Studied Heat Pump Process and Working Fluidsmentioning

confidence: 91%

Design considerations for high-temperature heat pump centrifugal compressors

Jaatinen-Värri,

Tiainen,

Honkatukia

et al. 2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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“…In this section, some analytical equations are derived through aerothermodynamic analyses, which connect the pressure ratio with the work coefficient, the impeller outlet flow coefficient and the impeller outlet width. According to Li et al, 33 the total pressure ratio is expressed as…”

Section: Pressure Ratio Characteristic Curvesmentioning

confidence: 99%

A new method for performance map prediction of automotive turbocharger compressors with both vaneless and vaned diffusers

Zhao

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new approach to predict the performance maps of automotive turbocharger compressors is presented. Firstly, a polynomial equation is applied to fit the experimental data of flow coefficient ratios for the centrifugal compressors with both vaneless and vaned diffusers. Based on this equation, the choke and surge flow coefficients under different machine Mach numbers can be quickly predicted. Secondly, a physically based piecewise elliptic equation is used to define compressors’ characteristic curves in terms of efficiency ratio. By introducing the flow coefficient ratio into the efficiency correlation, the empirical coefficients in the piecewise elliptic equation are uniquely calibrated by the experimental data, forming a unified algebraic equation to match the efficiency maps of the compressors with both vaneless and vaned diffusers. Then, a new universal equation, which connects the work coefficient, the impeller outlet flow coefficient and the non-dimensional equivalent impeller outlet width, is derived by using classical aerothermodynamic method. The off-design pressure ratio is predicted based on the equivalent impeller outlet width with less knowledge of the compressor geometry and no empirical coefficients. Finally, three state-of-the-art turbocharger compressors (one with vaneless diffuser, two with vaned diffusers) are chosen to validate the proposed method, and the results show a satisfactory accuracy for the performance map prediction. This method can be used for the preliminary design of turbocharger compressors with both vaneless and vaned diffusers, or to assess the design feasibility and challenges of the given design specifications.

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“…In centrifugal compressor, the mass flow function Φ is usually used to assess the flow capacity of an impeller [32], and it is defined as…”

Section: Maximum Swallowing Capacitymentioning

confidence: 99%

A New Method for Impeller Inlet Design of Supercritical CO2 Centrifugal Compressors in Brayton Cycles

Zhao

Yao

et al. 2020

Energies

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Supercritical Carbon Dioxide (SCO2) is considered as a potential working fluid in next generation power and energy systems. The SCO2 Brayton cycle is advantaged with higher cycle efficiency, smaller compression work, and more compact layout, as compared with traditional cycles. When the inlet total condition of the compressor approaches the critical point of the working fluid, the cycle efficiency is further enhanced. However, the flow acceleration near the impeller inducer causes the fluid to enter two-phase region, which may lead to additional aerodynamic losses and flow instability. In this study, a new impeller inlet design method is proposed to achieve a better balance among the cycle efficiency, compressor compactness, and inducer condensation. This approach couples a concept of the maximum swallowing capacity of real gas and a new principle for condensation design. Firstly, the mass flow function of real gas centrifugal compressors is analytically expressed by non-dimensional parameters. An optimal inlet flow angle is derived to achieve the maximum swallowing capacity under a certain inlet relative Mach number, which leads to the minimum energy loss and a more compact geometry for the compressor. Secondly, a new condensation design principle is developed by proposing a novel concept of the two-zone inlet total condition for SCO2 compressors. In this new principle, the acceptable acceleration margin (AAM) is derived as a criterion to limit the impeller inlet condensation. The present inlet design method is validated in the design and simulation of a low-flow-coefficient compressor stage based on the real gas model. The mechanisms of flow accelerations in the impeller inducer, which form low-pressure regions and further produce condensation, are analyzed and clarified under different operating conditions. It is found that the proposed method is efficient to limit the condensation in the impeller inducer, keep the compactness of the compressor, and maintain a high cycle efficiency.

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A new methodology for preliminary design of centrifugal impellers with prewhirl

Cited by 7 publications

References 15 publications

Design considerations for high-temperature heat pump centrifugal compressors

Design considerations for high-temperature heat pump centrifugal compressors

A new method for performance map prediction of automotive turbocharger compressors with both vaneless and vaned diffusers

A New Method for Impeller Inlet Design of Supercritical CO2 Centrifugal Compressors in Brayton Cycles

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