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.
Flow Control in an Aggressive Interturbine Transition Duct Using Low Profile Vortex Generators
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.
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Zhang, Y., Hu, S., Zhang, X., Benner, M., Mahallati, A., and Vlasic, E. (June 3, 2014). "Flow Control in an Aggressive Interturbine Transition Duct Using Low Profile Vortex Generators." ASME. J. Eng. Gas Turbines Power. November 2014; 136(11): 112604. https://doi.org/10.1115/1.4027656
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