Numerical Investigation of a Centrifugal Compressor with a Pre-Compression Wedge Diffuser under High Subsonic Conditions

Wang, Yi; Li, Qingkuo; Bai, Huan; Zhou, Xueqi; Lu, Xingen

doi:10.1007/s11630-020-1332-0

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The effect of pre-compression angle on compressor performance was explored in a previous study. 17 A fixed pre-compression angle and channel median angle β are given here, while the throat width l w remains unchanged. δ is the ratio of the throat length to the throat width, which represents the 3 D characteristics of the throat.where l th is the throat length, and l w is the throat width.4.…”

Section: Case Descriptionsmentioning

confidence: 99%

Numerical investigation of the diffuser throat length effect on a transonic centrifugal compressor

Zhang

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Vaned diffuser inlet flow uniform is challenging when the impeller is throttled to stall. In this study, we extend the stable operating range of the compressor by improving the uniform flow of the diffuser inlet. First, a numerical investigation of a transonic centrifugal compressor with a vaned diffuser is presented and compared against test data. Then, a new diffuser parameterization method is pro- posed, and the throat feature of a pipe diffuser is successfully applied to parameterized vane diffusers. The influence of the throat length and divergence angle of the diffuser on the performance of the centrifugal compressor is studied via steady and non-linear harmonic simulations. Throat length delays the time of fluid pressurization and accommodates large flow instabilities from upstream—this widens the stall margin but increases mixing loss. Divergence angle affects compressor performance. Stage peak efficiency increases by about 0.58% as the divergence angle increases from 3.79° to 5.79° but drops to about 2.46% as the divergence angle further increases from 5.79° to 11.79°. This is because the boundary layers in the diffuser channel thicken with increasing divergence angle; additionally, the fluid near the hub-pressure side first becomes unstable, then flow separation occurs along the flow direction, which results in a large flow loss. Detailed performance maps of centrifugal compressors with different throat lengths and divergence angles are given to provide a reference for designing transonic centrifugal compressors.

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Section: Case Descriptionsmentioning

confidence: 99%

Numerical investigation of the diffuser throat length effect on a transonic centrifugal compressor

Zhang

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Full-cycle grids numerical simulation of the performance for newly developed micro turbine engine

Zhang,

Wu,

et al. 2024

HFF

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Purpose The purpose of this research is to investigate the feasibility of using the components series connection (CSC) method to predict the performance of a newly developed micro turbine engine (MTE) under rated operating condition. Design/methodology/approach The main research object is the MTE with known factory performance parameters, and the finite element method is used to discretize its main components into a full-cycle grid and then simulate it in the computational fluid dynamics method under rated operating condition using the CSC method. Finally, compare the results obtained by numerical simulations with the factory design parameters of the MTE. Findings The performance and flow field of MTE and each component were simulated and obtained. Compared with the factory design parameters, the errors are acceptable, with the outlet average total temperature and thrust exhibiting errors of 1.4% and 7.6%, respectively. Practical implications This paper introduces a faster and more convenient method for simulating the performance of MTE components and the entire engine while also making the simulations more realistic. The method was used to analyze the performance of the components and the whole engine of a newly developed MTE. Originality/value This research validates the feasibility of evaluating the overall performance of the MTE using the CSC method and provides a new method to solve performance calculations for MTE under any known working conditions.

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Numerical Investigation of a Centrifugal Compressor with a Pre-Compression Wedge Diffuser under High Subsonic Conditions

Cited by 2 publications

References 12 publications

Numerical investigation of the diffuser throat length effect on a transonic centrifugal compressor

Numerical investigation of the diffuser throat length effect on a transonic centrifugal compressor

Full-cycle grids numerical simulation of the performance for newly developed micro turbine engine

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