Effects of inlet radius and bell mouth radius on flow rate and sound quality of centrifugal blower

Kim, Jae Won; Byun, Seon-Woo; Ahn, Eun-Young

doi:10.1007/s12206-012-0311-0

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…The attachment of a hub cap affects the pressure rise, blade loading, and limiting streamline distribution below about a 25% span, but has little effect above a 25% span [23]. In the case of a bell mouth, if the axial distance at the shroud from the blade LE to the bell mouth is tight, it can significantly affect the inlet flow and the TLF, which directly correlates with the performance [24][25][26]. However, in order to stabilize the inlet flow near the shroud sufficiently [27], the axial distance of the axial fan in this study was secured to be at least 0.4 times the radius of shroud.…”

Section: Computational Domain and Grid Systemmentioning

confidence: 99%

Numerical Investigation of Performance and Flow Characteristics of a Tunnel Ventilation Axial Fan with Thickness Profile Treatments of NACA Airfoil

Kim

Lee²,

Lee

et al. 2020

Energies

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An axial flow fan, which is applied for ventilation in underground spaces such as tunnels, features a medium–large size, and most of the blades go through the casting process in consideration of mass production and cost. In the casting process, post-work related to roughness treatment is essential, and this is a final operation to determine the thickness profile of an airfoil which is designed from the empirical equation. In this study, the effect of the thickness profile of an airfoil on the performance and aerodynamic characteristics of the axial fan was examined through numerical analysis with the commercial code, ANSYS CFX. In order to conduct the sensitivity analysis on the effect of the maximum thickness position for each span on the performance at the design flow rate, the design of experiments (DOE) method was applied with a full factorial design as an additional attempt. The energy loss near the shroud span was confirmed with a quantified value for the tip leakage flow (TLF) rate through the tip clearance, and the trajectory of the TLF was observed on the two-dimensional (2D) coordinates system. The trajectory of the TLF matched well with the tendency of the calculated angle and correlated with the intensity of the turbulence kinetic energy (TKE) distribution. However, a correlation between the TLF rate and TKE could not be established. Meanwhile, the Q-criterion method was applied to specifically initiate the distribution of flow separation and inlet recirculation. The location accompanying the energy loss was mutually confirmed with the axial coordinates. Additionally, the nonuniform blade loading distribution, which was more severe as the maximum thickness position moved toward the leading edge (LE), could be improved significantly as the thickness near the trailing edge (TE) became thinner. The validation for the numerical analysis results was performed through a model-sized experimental test.

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Section: Computational Domain and Grid Systemmentioning

confidence: 99%

Numerical Investigation of Performance and Flow Characteristics of a Tunnel Ventilation Axial Fan with Thickness Profile Treatments of NACA Airfoil

Kim

Lee²,

Lee

et al. 2020

Energies

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“…20 In addition, Lee 21 revealed the impact of the fan gap flow, and Li et al 22 investigated the influence of enlarged impellers. Son et al 23 simulated the effect of the inlet radius and the bell mouth radius, and they also tested the sound effect. These works have extended the knowledge about the effects of structural parameters but the effects of manufacturing parameters are seldom addressed.…”

Section: Introductionmentioning

confidence: 99%

“…Son et al. 23 simulated the effect of the inlet radius and the bell mouth radius, and they also tested the sound effect. These works have extended the knowledge about the effects of structural parameters but the effects of manufacturing parameters are seldom addressed.…”

Section: Introductionmentioning

confidence: 99%

Multidisciplinary assessment of blade number and manufacturing parameters for the performance of centrifugal fans

Liu

Sun

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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This work targets the development of the multidisciplinary design for centrifugal fans, based on the calculation of the fan performance following changes in the fan structure and manufacture. A parametric method that starts from the blade number and manufacturing parameters is first developed to control the shape of fan assembly and its fluid domain. The parametric code, and the aerodynamic and structure analysing codes are then integrated, from the solution of which algorithms are developed to calculate the fan indexes including the flow rate, pressure rise, fan efficiency, fan strength, and the motor power. Validation of the proposed method is performed by the comparison with an experimental test. An orthogonal sampling opens out relevant changes of the fan working performance with respect to the blade number and manufacturing parameters. Results suggest ranges for the blade number and manufacturing parameters that have a sound performance and structure safety when converting the motor power to airflow.

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Design and Development of Arachis Hypogaea (Peanut) Decortication Machine

Maskey

Balappa

2023

Lecture Notes in Mechanical Engineering

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Effects of inlet radius and bell mouth radius on flow rate and sound quality of centrifugal blower

Cited by 18 publications

References 10 publications

Numerical Investigation of Performance and Flow Characteristics of a Tunnel Ventilation Axial Fan with Thickness Profile Treatments of NACA Airfoil

Numerical Investigation of Performance and Flow Characteristics of a Tunnel Ventilation Axial Fan with Thickness Profile Treatments of NACA Airfoil

Multidisciplinary assessment of blade number and manufacturing parameters for the performance of centrifugal fans

Design and Development of Arachis Hypogaea (Peanut) Decortication Machine

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