The performance of the compressor blade is considerably influenced by secondary flow effects, like the cross flow on the end wall as well as corner flow separation between the wall and the blade. Computational Fluid Dynamics (CFD) has been extensively used to analyze the flow through rotating machineries, in general and through axial compressors, in particular. The present work is focused on the studying the effects of Vortex Generator (VG) on test compressor at CSIR National Aerospace Laboratories, Bangalore, India using CFD. The compressor consists of NACA transonic rotor with 21 blades and subsonic stator with 18 vanes. The design pressure ratio is 1.35 at 12930 RPM with a mass flow rate of 22 kg/s. Three configurations of counter rotating VGs were selected for the analysis with 0.25δ, 0.5δ and δ height, where δ was equal to the physical thickness of boundary layer (8mm) at inlet to the compressor rotor [11]. The vortex generators were placed inside the casing at 18 percent of the chord ahead to the leading edge of the rotor. A total of 63 pairs of VGs were incorporated, with three pairs in one blade passage. Among the three configurations, the first configuration has greater impact on the end wall cross flow and flow deflection which resulted in enhanced numerical stall margin of 3.5% from baseline at design speed. The reasons for this numerical stall margin improvement are discussed in detail.
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ASME 2015 Gas Turbine India Conference
December 2–3, 2015
Hyderabad, India
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5731-1
PROCEEDINGS PAPER
CFD Analysis to Investigate the Effect of Vortex Generators on a Transonic Axial Flow Compressor Stage Available to Purchase
Avinash Kumar Rajendran,
Avinash Kumar Rajendran
Amrita School of Engineering, Amritapuri, India
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M. T. Shobhavathy,
M. T. Shobhavathy
CSIR-NAL, Bangalore, India
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R. Ajith Kumar
R. Ajith Kumar
Amrita School of Engineering, Amritapuri, India
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Avinash Kumar Rajendran
Amrita School of Engineering, Amritapuri, India
M. T. Shobhavathy
CSIR-NAL, Bangalore, India
R. Ajith Kumar
Amrita School of Engineering, Amritapuri, India
Paper No:
GTINDIA2015-1313, V001T01A014; 8 pages
Published Online:
February 10, 2016
Citation
Kumar Rajendran, A, Shobhavathy, MT, & Ajith Kumar, R. "CFD Analysis to Investigate the Effect of Vortex Generators on a Transonic Axial Flow Compressor Stage." Proceedings of the ASME 2015 Gas Turbine India Conference. ASME 2015 Gas Turbine India Conference. Hyderabad, India. December 2–3, 2015. V001T01A014. ASME. https://doi.org/10.1115/GTINDIA2015-1313
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