Determination the Performance Instability Range and Analysis of the Effect of Blade Tip and Hub Vortices in a Reversible Axial Flow Fan

Document Type : Original Article

Authors

1 PhD student, Guilan University, Rasht, Iran

2 Professor, Guilan University, Rasht, Iran

3 Associate Professor, Guilan University, Rasht, Iran

Abstract

The main goal of the present study is to determine the stable and unstable performance limits of a reversible axial flow fan by 3D numerical simulation. Reversible axial fans are a special type of axial fans that have the ability to create air flow in both directions by using a symmetrical blade profile in them. The main use of these fans is to discharge smoke and polluted air from channels and highway tunnels in emergency situations such as fire and also in normal operating conditions. In the present study, a reversible axial flow fan has been simulated three dimensionally.The qualitative results obtained from the numerical simulation indicate the presence of instability and the creation of vortices in areas such as the tip of the blade (flow leakage from the pressure surface to the suction in the gap distance of the tip of the blade) and also on the trailing edge and the suction surface of the blades (flow separation) in lower volume flows  from 26 (m3/s) and entering the fan in the stall area. The study of aerodynamic parameters and performance curves shows that the best performance range of the fan at a rotational speed of 900 rpm, is in the volume flow range of more than 26 (m3/s).

Keywords

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https://creativecommons.org/licenses/by/4.0/

References

1.       Spasić, Ž., Jovanović, M., And Bogdanović-Jovanović, J., “Design And Performance of Low-Pressure Reversible Axial Fan with Doubly Curved Profiles of Blades”, J Mech Sci Technol, Vol. 32, No. 8, pp. 3707-3712, 2018. DOI:10.1007/S12206-018-0723-6
2.       Mckenzie, A. B. “Axial Flow Fans and Compressors”, Aerodynamic Design and Performance, 1997.
3.       Keklikoglu, H. “Design, Construction and Performance Evaluation of Axial Flow Fans”, PhD Dissertation, Middle East Technical University, 2019.
4.       Bleier, F. P.,  “Fan Handbook: Selection, Application, and Design”, Mcgraw-Hill., 1998.
5.       Moghadam, S. M. A., Meinke, M., and Schröder, W., “Analysis of Tip-Leakage Flow in an Axial Fan at Varying Tip-Gap Sizes and Operating Conditions”, Computers And Fluids, Vol. 183, No. 4, pp. 107-129,2019. DOI: 10.1016/J.Compfluid.2019.01.014
6.       Lee, H., Park, K., and Choi, H., “Experimental Investigation of Tip-Leakage Flow in an Axial Flow Fan at Various Flow Rates”, J Mech Sci Technol, Vol. 33, No. 3, pp.1271-1278,2019. DOI:10.1007/S12206-019-0227-Z
7.       Benedek, T., Vad, J., and Lendvai, B., “Combined Acoustic and Aerodynamic Investigation of the Effect of Inlet Geometry on Tip Leakage Flow Noise of Free-Inlet Free-Exhaust Low-Speed Axial Flow Fans”, Appl Acoust, Vol. 187, Pp. 108488, 2022.DOI: 10.1016/J.Apacoust.2021.108488
8.       Abdolmaleki, M., Mohammadian Bishe, E., Afshin, H., and Farhanieh, B., “Numerical And Experimental Study Of A Reversible Axial Flow Fan”, Int J Comput Fluid, Vol. 34, No. 3, pp. 173-186, 2020. DOI: 10.1080/10618562.2020.1721481
9.       Wang, J., and Kruyt, N. P., “Computational Fluid Dynamics Simulations of Aerodynamic Performance of Low-Pressure Axial Fans with Small Hub-to-Tip Diameter Ratio” , J Fluid Eng-T Asme, Vol. 142, No. 9, pp. 091202, 2020. DOI: 10.1115/1.4047120
10.    Abdolmaleki, M., Afshin, H., and Farhanieh, B., “Performance Analysis of Elliptic-Profile Airfoil Cascade for Designing Reversible Axial Flow Fans”, AIAA J, Vol. 57, No. 4, pp. 1492-1501, 2019. DOI: 10.1063/5.0143486
11.    Jung, J. H., And Joo, W.-G., “The Effect of the Entrance Hub Geometry on the Efficiency in an Axial Flow Fan”, Int J Refrig, Vol. 101, pp.90-97,2019. DOI:10.1016/J.Ijrefrig.2019.02.026
12.    Tóth, B., and Vad, J., “Algorithmic Localisation of Noise Sources in the Tip Region of a Low-Speed Axial Flow Fan”, J Sound Vib, Vol. 393, pp. 425-441, 2017.                                      DOI: 10.1016/J.Jsv.2017.01.011
13.    Luo, B., Chu, W., and Zhang, H., “Tip Leakage Flow and Aeroacoustics Analysis of a Low-Speed Axial Fan,” Aerosp Sci Technol, Vol. 98, pp. 105700, 2020. DOI: 10.1016/J.Ast.2020.105700
14.    Gullberg, P., and Sengupta, R., “Axial Fan Performance Predictions in CFD, Comparison of MRF and Sliding Mesh with Experiments”,  0148-7191, Sae Technical Paper, 2011.
15.    Tian, W., Ozbay, A., Wang, X., and Hu, H., “Experimental Investigation on the Wake Interference Among Wind Turbines Sited in Atmospheric Boundary Layer Winds”, Acta Mech Sinica, Vol. 33, pp. 742-753, 2017. DOI: 10.1007/S10409-017-0684-5
16.    Ghorbanian, K., Soltani, M. R., and Manshadi, M. D., “Experimental Investigation on Turbulence Intensity Reduction in Subsonic Wind Tunnels”, Aerosp Sci Technol, Vol. 15, No. 2, pp. 137-147, 2011. DOI: 10.1016/J.Ast.2010.06.009
17.    Wilcox, D. C., “Reassessment of the Scale-Determining Equation for Advanced Turbulence Models”, Aiaa J, Vol. 26, No. 11, pp. 1299-1310, 1988. DOI: 10.2514/3.10041
18.    Menter, F. R., “Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications”, Aiaa Journal, Vol. 32, No. 8, pp. 1598-1605, 1994. DOI: 10.2514/3.12149
19.    Khoshnejad, A., Ebrahimi, R., and Pouryoussefi, S. G., “Numerical Investigation Of Plasma Actuator Induced Forcing Direction on the Performance of a Low-Speed Isolated Axial Compressor Rotor”, J Electrostat, Vol. 118, pp. 103732, 2022. DOI: 10.1016/J.Elstat.2022.103732
20.    Menter, F. R., Kuntz, M., and Langtry, R., “Ten Years of Industrial Experience with the SST Turbulence Model”, Turbulence, Heat Mass Transfer, Vol. 4, No. 1, pp. 625-632, 2003
21.    Anzalotta, C., Joshi, K., Fernandez, E., and Bhattacharya, S., “Effect of Forcing the Tip-Gap of a NACA0065 Airfoil Using Plasma Actuators: a Proof-Of-Concept Study,” Aerosp Sci Technol, Vol. 107, Pp. 106268, 2020. DOI: 10.1016/J.Ast.2020.106268
22.    R. K. Turton, “Principles of Turbomachinery”,  Chapman and Hall., 1995.
Fluid Mechanics & Aerodynamics
Volume 12, Issue 2 - Serial Number 32
Autumn and winter 2023
March 2024
Pages 169-180

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History

  • Receive Date: 23 October 2023
  • Revise Date: 19 January 2024
  • Accept Date: 02 February 2024
  • Publish Date: 19 February 2024

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