0
Research Papers: Gas Turbines: Turbomachinery

Flow Control in an Aggressive Interturbine Transition Duct Using Low Profile Vortex Generators

[+] Author and Article Information
Yanfeng Zhang, Shuzhen Hu, Xue-Feng Zhang, Michael Benner, Ali Mahallati

National Research Council of Canada,
Ottawa, ON K1A 0R6, Canada

Edward Vlasic

Pratt & Whitney Canada,
Longueuil, QC J4G 1A1, Canada

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 14, 2013; final manuscript received April 8, 2014; published online June 3, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(11), 112604 (Jun 03, 2014) (8 pages) Paper No: GTP-13-1010; doi: 10.1115/1.4027656 History: Received January 14, 2013; Revised April 08, 2014

This paper presents an experimental investigation of the flow mechanisms in an aggressive interturbine transition duct with and without low-profile vortex generators flow control. The interturbine duct had an area ratio of 1.53 and a mean rise angle of 35 deg. Measurements were made inside the annulus at a Reynolds number of 150,000. At the duct inlet, the background turbulence intensity was raised to 2.3% and a uniform swirl angle of 20 deg was established with a 48-airfoil vane ring. Results for the baseline case (no vortex generators) showed the flow structures within the duct were dominated by counter-rotating vortices and boundary layer separation in both the casing and hub regions. The combination of the adverse pressure gradient at the casing's first bend and upstream low momentum wakes caused the boundary layer to separate on the casing. The separated flow on the casing appears to reattach at the second bend. Counter-rotating and corotating vortex generators were installed on the casing. While both vortex generators significantly decreased the casing boundary layer separation with consequential reduction of overall pressure losses, the corotating configuration was found to be more effective.

FIGURES IN THIS ARTICLE
<>
Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Dominy, R. G., and Kirkham, D. A., 1995, “The Influence of Swirl on the Performance of Inter-Turbine Diffusers,” VDI Ber., 1186, pp. 107–122.
Dominy, R. G., and Kirkham, D. A., 1996, “The Influence of Blade Wakes on the Performance of Inter-Turbine Diffusers,” ASME J. Turbomach., 118(2), pp. 347–352. [CrossRef]
Dominy, R. G., Kirkham, D. A., and Smith, A. D., 1998, “Flow Development Through Inter-Turbine Diffusers,” ASME J. Turbomach., 120(2), pp. 298–304. [CrossRef]
Hu, S. Z., Zhang, Y. F., Zhang, X. F., and Vlasic, E., 2011, “Influences of Inlet Swirl Distributions on an Inter-Turbine Duct: Part I—Casing Swirl Variation,” ASME Paper No. GT2011-45554. [CrossRef]
Zhang, Y. F., Hu, S. Z., Zhang, X. F., and Vlasic, E., 2011, “Influences of Inlet Swirl Distributions on an Inter-Turbine Duct: Part II—Hub Swirl Variation,” ASME Paper No. GT2011-45555. [CrossRef]
Miller, R. J., Moss, R. W., Ainsworth, R. W., and Harvey, N. W., 2003, “The Development of Turbine Exit Flow in a Swan-Necked Inter-Stage Diffuser,” ASME Paper No. GT2003-38174. [CrossRef]
Axelsson, L.-U., and Johansson, T. G., 2008, “Experimental Investigation of the Time-Averaged Flow in an Intermediate Turbine Duct,” ASME Paper No. GT2008-50829. [CrossRef]
Marn, A., Göttlich, E., Pecnik, R., Malzacher, F. J., Schennach, O., and Pirker, H. P., 2007, “The Influence of Blade Tip Gap Variation on the Flow Through an Aggressive S-Shaped Intermediate Turbine Duct Downstream of a Transonic Turbine Stage: Part I—Time-Averaged Results,” ASME Paper No. GT2007-27405. [CrossRef]
Göttlich, E., Marn, A., Pecnik, R., Malzacher, F. J., Schennach, O., and Pirker, H. P., 2007, “The Influence of Blade Tip Gap Variation on the Flow Through an Aggressive S-Shaped Intermediate Turbine Duct Downstream of a Transonic Turbine Stage: Part II—Time-Averaged Results and Surface Flow,” ASME Paper No. GT2007-28069. [CrossRef]
Marn, A., Gottlich, E., Malzacher, F., and Pirker, H. P., 2012, “The Effect of Rotor Tip Clearance Size onto the Separated Flow Through a Super-Aggressive S-Shaped Intermediate Turbine Duct Downstream of a Transonic Turbine Stage,” ASME J. Turbomach., 134(5), p. 051019. [CrossRef]
Zhang, Y. F., Zhang, X. F., Mahallati, A., and Vlasic, E., 2013, “Aerodynamic Design of Low Aspect Ratio Structural Airfoils Within an Inter-Turbine Duct,” ISABE Paper No. 2013-1149.
Göttlich, E., 2011, “Research on the Aerodynamics of Intermediate Turbine Diffusers,” Prog. Aerosp. Sci., 47(4), pp. 249–279. [CrossRef]
Lin, J. C., Howard, F. G., and Selby, G. V., 1990, “Small Submerged Vortex Generators for Turbulent Flow Separation Control,” J. Spacecr. Rockets, 27(5), pp. 503–507. [CrossRef]
Kerho, M., Hutcherson, S., Blackwelder, R. F., and Liebeck, R. H., 1993, “Vortex Generators Used to Control Laminar Separation Bubbles,” J. Aircr., 30(3), pp. 315–319. [CrossRef]
Velte, C. M., Hansen, M. O. L., and Cavar, D., 2008, “Flow Analysis of Vortex Generators on Wing Sections by Stereoscopic Particle Image Velocimetry Measurements,” Environ. Res. Lett., 3(1), p. 015006. [CrossRef]
Hergt, A., Meyer, R., Müller, M., and Engel, K., 2008, “Loss Reduction in Compressor Cascades by Means of Passive Flow Control,” ASME Paper No. GT2008-50357. [CrossRef]
Holmes, A. E., Hickey, P. K., Murphy, W. R., and Hilton, D. A., 1987, “The Application of Sub-Boundary Layer Vortex Generators to Reduce Canopy Mach Rumble Interior Noise on the Gulfstream,” AIAA Paper No. 87-0084. [CrossRef]
Reichert, B. A., and Wendt, B. J., 1994, “Improving Diffusing S-Duct Performance by Secondary Flow Control,” AIAA Paper No. 94-0365. [CrossRef]
Satta, F., Simoni, D., Ubaldi, M., Zunino, P., Bertini, F., and Spano, E., 2007, “Velocity and Turbulence Measurements in a Separating Boundary Layer With and Without Passive Flow Control,” Proc. Inst. Mech. Eng., Part A, 221(6), pp. 815–823. [CrossRef]
Canepa, E., Lengani, D., Satta, F., Spano, E., Ubaldi, M., and Zunino, P., 2006, “Boundary Layer Separation on a Flat Plate With Adverse Pressure Gradients Using Vortex Generators,” ASME Paper No. GT2006-90809. [CrossRef]
Wallin, F., and Eriksson, L.-E., 2006, “A Tuning-Free Body-Force Vortex Generator Model,” AIAA Paper No. 2006-0873. [CrossRef]
Wallin, F., and Eriksson, L.-E., 2008, “Design of an Aggressive Flow-Controlled Turbine Duct,” ASME Paper No. GT2008-51202. [CrossRef]
Santner, C., Gottlich, E., Marn, A., Hubinka, J., and Paradiso, B., 2010, “The Application of Low-Profile Vortex Generators in an Intermediate Turbine Diffuser,” ASME Paper No. GT2010-22892. [CrossRef]
Marn, A., 2008, “On the Aerodynamics of Intermediate Turbine Ducts for Competitive and Environmentally Friendly Jet Engines,” PhD thesis, Graz University of Technology, Graz, Austria.
Lin, J. C., 2002, “Review of Research on Low-Profile Vortex Generators to Control Boundary-Layer Separation,” Prog. Aerosp. Sci., 38(4–5), pp. 389–420. [CrossRef]
Harrison, S., 1990, “Secondary Loss Generation in a Linear Cascade of High-Turning Turbine Blades,” ASME J. Turbomach., 112(4), pp. 618–624. [CrossRef]
Gregory-Smith, D. G., Graves, C. P., and Walsh, J. A., 1988, “Growth of Secondary Loss and Vorticity in an Axial Turbine Cascade,” ASME J. Turbomach., 110(1), pp. 1–8. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Cutaway of ITD test rig with measurement locations and coordinate system

Grahic Jump Location
Fig. 2

Low-profile vortex generator configurations

Grahic Jump Location
Fig. 3

Hub and casing static pressure coefficient distribution at baseline

Grahic Jump Location
Fig. 4

Total pressure and streamwise vorticity coefficient contours at baseline

Grahic Jump Location
Fig. 5

Hub and casing flow visualizations at baseline

Grahic Jump Location
Fig. 6

Casing flow visualization with flow control

Grahic Jump Location
Fig. 7

Hub and casing static pressure coefficient distribution with and without flow control

Grahic Jump Location
Fig. 8

Total pressure and streamwise vorticity coefficient contours in ITD with flow control

Grahic Jump Location
Fig. 9

Pitchwise mass-averaged total pressure loss coefficients at the ITD outlet

Grahic Jump Location
Fig. 10

Loss coefficients in ITD with and without LPVGs flow control

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In