Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Daku, Gábor; Vad, János

doi:10.1177/09576509211026821

Cited by 3 publications

(2 citation statements)

References 40 publications

(215 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the cooling fan is one type of axial fan, several investigations also have been concentrated on high-speed axial fans [17], low-speed axial fans [18][19][20], low-pressure axial fans [21,22], and hollow blade axial fans [23,24]. Hu et al [25] conducted an FW-H acoustic simulation on high-speed axial flow fans, and the results showed that the noise on the blade pressure surface was greater than that on the suction surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Aerodynamic and Aeroacoustic Characteristics in New Energy Vehicle Cooling Fan with Shroud

Huang,

Xu,

Wang

et al. 2024

Processes

View full text Add to dashboard Cite

The cooling fan is one of the important noise sources for new energy vehicles, and the research on its aerodynamic and aeroacoustic characteristics is of great help to improve the noise, vibration and harshness performance of new energy vehicles. However, most of these studies focus on the impeller, and little consideration has been given to the study of the shroud. Based on the coupling calculation method of large eddy simulation and the Ffowcs-Williams and Hawkings acoustics model, the aerodynamic and aeroacoustic characteristics in a cooling fan with the shroud are investigated at flow rates from 0.623 kg/s to 1.019 kg/s (where 0.865 kg/s is the flow rate corresponding to the best efficiency point). The accuracy of numerical simulation results is verified by the grid independence verification and the comparison of experimental data. Research shows that several large-scale vortex structures are observed in the clearance between the impeller and the shroud. The maximum peak-to-peak values of pressure fluctuation at different flow rates occur in the intermediate section or outlet section of the shroud. Although the shroud contributes relatively less to the far field noise, its different distribution may change the position of the maximum sound pressure level. The dominant frequency of pressure fluctuation equals the blade passage frequency (BPF) and the maximum SPL is around the BPF, both of which are independent of flow rates. The maximum SPL and the amplitude of the dominant frequency decrease as the flow rate increases.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Aerodynamic and Aeroacoustic Characteristics in New Energy Vehicle Cooling Fan with Shroud

Huang,

Xu,

Wang

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…Vortex shedding from streamlined bodies can be observed in the case of low-speed fans for instance. One of the most prominent noise sources of these fans originates from the so-called profile vortex shedding [3,4]. This phenomenon is still in the focus of current research, thus, the thorough description and understanding of it is desirable.…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Parameter Identification of the Lagrangian-averaged Vorticity Deviation Vortex Detection Method Through the Investigation of Fluid Flow Around Solid Bodies

Kovács,

Balla

2023

Period. Polytech. Mech. Eng.

View full text Add to dashboard Cite

The main focus of the current paper is the detection of vortices in fluid flow around a circular cylinder and a square cylinder, with an emphasis on the identification of the parameters used for vortex detection. The authors aim to enhance the practicality of an existing vortex detection method (Lagrangian-averaged vorticity deviation) by providing recommendations for the settings of the vortex detection parameters. The simulations were carried out using ANSYS Workbench 2022 R2, encompassing Reynolds numbers between 12 and 140, and angles of incidence from 0° to 45°. The vortex detection was performed using MATLAB R2020b. The paper provides a comprehensive description of the parameters involved in the detection process and their significance, as well as the implementation of the parameter identification. The study results in the determination of the suggested parameter ranges, and a comparative analysis of different vortex detection methods is also presented for the case of the circular cylinder.

show abstract

A Comprehensive Analytical Model for Vortex Shedding From Low-Speed Axial Fan Blades

Daku¹,

Vad²

2023

Journal of Turbomachinery

View full text Add to dashboard Cite

The paper presents a comprehensive analytical model for the characterization of von Karman vortex shedding in the wake of models of low-speed axial fan blades. The elaborated minimal model is based on the Reynolds-averaged Navier-Stokes and continuity equations. For validation purposes, hot-wire measurements have been carried out in a wind tunnel on representative blade profiles. The measurement data obtained for various streamwise positions downstream of the blade trailing edge, i.e. transversal profiles of mean velocity as well as root-mean-square of fluctuating velocity, are evaluated. As the experimental validation demonstrates, the minimal model fairly localizes the transversal position of the vortex centres, and represents the motion of the vortices along the wake. The validated minimal model serves with the following benefits. a) An extensive understanding of the underlying physics related to the flow field featuring vortex shedding in the near-wake region. Easy-to-use quantitative correlation among the characteristics of wake flow affected by the shed vortices. b) Extension of the literature-based methodology for determination of the transversal distance between the shed vortex rows, being used as scaling parameter for the Strouhal number utilized in calculation of vortex shedding frequency. c) Modelling the behavior of rows of shed vortices farther away from the trailing edge. Such behavior may influence the acoustic signature of VS, and, as such, it is to be considered in fan noise modelling.

show abstract

Profile vortex shedding from low-speed axial fan rotor blades: a modelling overview

Cited by 3 publications

References 40 publications

Numerical Investigation on the Aerodynamic and Aeroacoustic Characteristics in New Energy Vehicle Cooling Fan with Shroud

Numerical Investigation on the Aerodynamic and Aeroacoustic Characteristics in New Energy Vehicle Cooling Fan with Shroud

Parameter Identification of the Lagrangian-averaged Vorticity Deviation Vortex Detection Method Through the Investigation of Fluid Flow Around Solid Bodies

A Comprehensive Analytical Model for Vortex Shedding From Low-Speed Axial Fan Blades

Contact Info

Product

Resources

About