3D-CFD-Study of Aerodynamic Losses in Compressor
                    Impellers

Zhang, Fangming; Baar, Roland

doi:10.4271/02-11-03-0015

Cited by 4 publications

(8 citation statements)

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“…If blade-to-blade pressure gradients initiate secondary flows, a local loss known as blade loading occurs; if the spanwise pressure distribution results in secondary flows, the loss is known as hub-to-shroud loading. 10,11 Figure 16 shows that the local EGR in the impeller chamber was lower near the hub than near the shroud wall in both conditions. This can be explained by the fact that the relative flow motion increased closer to the blade tip, and the interactions between the main stream and tip vortices intensified.…”

Section: Inlet Egrmentioning

confidence: 98%

“…The EGR of each control volume (EGR or _ s gen ) was measured by volume averaging the EGR in a selected domain, as shown in equation (11).…”

Section: Bementioning

confidence: 99%

“…In the figure, the cliffs in the EGR profiles are the result of external losses generated by reversed flows, known as recirculation losses. 10,11 It has been shown that this local loss causes EGR more through unwanted mechanical work than heat transfer.…”

Section: Inlet Egrmentioning

confidence: 99%

“…Internal losses are defined as local losses that affect both the efficiency and pressure ratio; external losses result in an efficiency drop. Internal losses include incidence, 9 entrance diffusion, 10 blade loading, 10,11 skin friction, 11 shock waves, 10,12 wake, 13 tip leakage, 14 and distortion losses. 15 External losses include recirculation, disk friction, and leakage.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Entropy generation rate analysis of turbocharger radial flow compressor in range from surge to choke

Altafi,

Mojaddam,

Bastankhah

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study compares the local losses of a radial compressor in the range from surge to choke considering shock phenomena, boundary layer separation, and mixing mechanisms. For this purpose, formulation of the local entropy generation rate (EGR) is added to the computational fluid dynamics (CFD) solver, which models the turbulent flow field of the compressor through the RANS approach. For validation, the numerical pressure rise curve of the compressor is compared with the experimental data. The results indicate that at the design point, the impeller, diffuser, and the volute account for approximately 50.8%, 30.0%, and 12.3% of the EGR, respectively, with approximately 5% in the impeller backspace, 1% in the diffuser cavity, and less than 0.5% in the inlet duct. Approaching the surge condition, local losses due to mixing and shock waves decline while boundary layer losses increase. Based on comprehensive analysis of the leading-edge boundary layer, the largest dead-air zone is found at the design point, resulting in a lower diffusion entrance loss and a higher mixing loss. Furthermore, the EGR variation in the diffuser channel is investigated by shedding light on mixing dynamics and classification of the channel flow regime into three different zones based on mixing ratio (MR). The outcomes show that the flow regime tends to mix more quickly at a higher MR, resulting in a slight decrease in EGR, which benefits compressor performance. We demonstrate that the mixing rate of flow regimes decreases in both the leading-edge boundary layer and the radial diffuser approaching the surge margin.

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Section: Inlet Egrmentioning

confidence: 98%

“…The EGR of each control volume (EGR or _ s gen ) was measured by volume averaging the EGR in a selected domain, as shown in equation (11).…”

Section: Bementioning

confidence: 99%

Section: Inlet Egrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Entropy generation rate analysis of turbocharger radial flow compressor in range from surge to choke

Altafi,

Mojaddam,

Bastankhah

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The CFD techniques for turbomachinery modeling are the best tool for understanding certain complex aerodynamic phenomena characteristic of this type of flow. Studies developed by Junaidi et al (2015), Lam & Peng (2016), and Zhang & Baar (2018) showed that this technique is widely applied to various types of turbomachinery.…”

Section: Introductionmentioning

confidence: 99%

Numerical-experimental comparison of radial fans applied in pneumatic transport of agricultural fertilizer spreaders

Fogal

Micheli

Scalon

et al. 2021

Rev. bras. eng. agríc. ambient.

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This study presents a numerical and experimental comparison of two different types of radial fans used in an agricultural fertilizer spreader at a rotation of 4000 rpm. The numerical analysis was validated through experiments conducted on a test bench using a hot-wire anemometer for velocity measurements and a Pitot tube for pressure readings. A simulation of the agricultural fertilizer spreader was carried out after the experimental validation of the mathematical models of the radial fans on the test bench to evaluate the air distribution behavior along the application nozzles, which was compared to the experimental results. A turbulent mean-field was obtained using the Reynolds Averaged Navier Stokes (RANS) and the k-Epsilon turbulence model was used for two equations. The computational fluid dynamics software CFX 18.1 was used to solve the transport equations. Unstructured tetrahedral meshes generated by the ICEM CFD 18.1 software were used in all models. The applied method is adequate and able to reproduce the fluid-dynamic behavior of airflow in pneumatic systems of agricultural fertilizer spreaders, avoiding the need for prototypes.

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Thermodynamics Investigation and Spike-stall Identification Based on Energy Loss of Centrifugal Compressor

Hu¹,

Geng²,

Yang³

et al. 2021

International Journal of Heat and Mass Transfer

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3D-CFD-Study of Aerodynamic Losses in Compressor Impellers

Cited by 4 publications

References 0 publications

Entropy generation rate analysis of turbocharger radial flow compressor in range from surge to choke

Entropy generation rate analysis of turbocharger radial flow compressor in range from surge to choke

Numerical-experimental comparison of radial fans applied in pneumatic transport of agricultural fertilizer spreaders

Thermodynamics Investigation and Spike-stall Identification Based on Energy Loss of Centrifugal Compressor

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