Commenced in January 2007
Paper Count: 30169
Numerical Analysis of a Centrifugal Fan for Improved Performance using Splitter Vanes
Abstract:The flow field in a centrifugal fan is highly complex with flow reversal taking place on the suction side of impeller and diffuser vanes. Generally performance of the centrifugal fan could be enhanced by judiciously introducing splitter vanes so as to improve the diffusion process. An extensive numerical whole field analysis on the effect of splitter vanes placed in discrete regions of suspected separation points is possible using CFD. This paper examines the effect of splitter vanes corresponding to various geometrical locations on the impeller and diffuser. The analysis shows that the splitter vanes located near the diffuser exit improves the static pressure recovery across the diffusing domain to a larger extent. Also it is found that splitter vanes located at the impeller trailing edge and diffuser leading edge at the mid-span of the circumferential distance between the blades show a marginal improvement in the static pressure recovery across the fan. However, splitters provided near to the suction side of the impeller trailing edge (25% of the circumferential gap between the impeller blades towards the suction side), adversely affect the static pressure recovery of the fan.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055168Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2679
 Ogawa, T. & Gopalakrishnan, G., "Flow Calculation in a Centrifugal Impeller by the Method of Singularities and its Experimental Verification," Proc. Of the Seventh National Conference on Fluid Power and Fluid Mechanics, 1977, Baroda, India.
 Ogawa, T. & Gopalakrishnan, G., "Use of Splitter Vanes in Centrifugal Compressor Impellers," Proc. Of the Eighth Canadian Congress of Applied Mechanics, 1981, Moncton, Canada
 Bhargava, R.K. & Gopalakrishnan, G., 1978, "Optimising Splitter Vane Locations Using the Method of Singularities," Proc. Of the First International Conference on Centrifugal Compressor Technology, 1978, I. I. T. Madras, India
 Fabri, J., "Flow Distribution in a Radial Impeller with Splitter Vanes," Proc. Of the First International Conference on Centrifugal Compressor Technology, 1978, I.I.T. Madras, India
 Millour, V., "3D Flow Computations in a Centrifugal Compressor with Splitter Blade Including Viscous Effect Simulation," 16th Congress, International Council of Aeronautical Societies, Volume 1, 1988, pp. 842 - 847
 Fradin, C., "Investigation of the Three Dimensional Flow near the Exit of Two Backswept Transonic Centrifugal Impellers," Proc. of the Eighth International Symposium in Air Breathing Engines, 1987, pp. 149 -155
 Gui, L., Gu, C., Chang, H., "Influences of Splitter Blades on the Centrifugal Fan Performances," 1989, ASME paper 89-GT-33
 Kergourlay, G., Younsi, M., Bakir, F. and Rey, R., Influence of Splitter Blades on the Flow Field of a Centrifugal Pump: Test-Analysis Comparison, International Journal of Rotating Machinery, Volume 2007, Article ID 85024, 13 pages.
 Teipel I. and Wiedermann, A. "Computation of Flowfields in Centrifugal Compressor Diffusers with Splitter Vanes", The International Gas Turbine Congress, 1987, (2) pp. II-311- II-317.
 Oana, M., Kawamoto, O., Ohtani, H., Yamamoto, Y., "Approach to High Performance Transonic Centrifugal Compressor," AIAA paper 2002-3536
 J. McGlumphy "Numerical Investigation of Subsonic Axial-Flow Tandem Airfoils for a Core Compressor Rotor", PhD Dissertation, 2008, Mechanical Engineering Department Virginia Tech.
 Fatsis, A., Pierret, S. and Van den Braembussche, R., "Threedimensional unsteady flow and forces in centrifugal impellers with circumferential distortion of the outlet static pressure", Journal of Turbomachinery, 1997, 119, pp 94-102.
 Sorokes, J. M., Borer, J.C. and Koch, J.M., 1998, "Investigation of the circumferential static pressure non-uniformity caused by centrifugal compressor discharge volute", 98 GT 326, International Gas Turbine & Aeroengine Congress & Exhibition, Stockholm, 1998, Sweden.
 Hillewaert, K. and Van den Braembussche, R.A., "Numerical simulation of impeller-volute interaction in centrifugal compressors", Journal of Turbomachinery, 121, 1999, pp 603-608.
 Shi, F. and Tsukamoto, H., "Numerical Study of Pressure Fluctuations Caused by Impeller-Diffuser Interaction in a Diffuser Pump Stage", Transactions of the ASME, 9, Vol. 123, 2001, pp. 466 - 474.
 Meakhail, T. and Park, S.O., "A Study of Impeller-Diffuser-Volute Interaction in a Centrifugal Fan", ASME Journal of Turbomachinery, 127, 2005, pp. 84 - 90.
 Fluent 6.3, Fluent Inc., 2006.
 Patankar, S.V., Numerical Heat Transfer and Fluid Flow, Tailor and Francis, (1980), pp. 90-92.