Recent numerical simulations have indicated the potential of plasma-based active flow control for improving the efficiency of highly loaded low-pressure turbines. The configuration considered in the current and earlier simulations correspond to previous experiments and computations for the flow at a Reynolds number of 25,000 based on axial chord and inlet conditions. In this situation, massive separation occurs on the suction surface of each blade due to uncovered turning, causing blockage in the flow passage. It was numerically demonstrated that asymmetric dielectric-barrier-discharge actuators were able to mitigate separation, thereby decreasing turbine wake losses. The present investigation extends this work by investigating a number of plasma-based flow control strategies. These include the chordwise location of actuation, spanwise periodic arrays of actuators, multiple actuation in the streamwise direction, and spanwise-direct actuation. The effect of alternate plasma-force models is also considered. Solutions were obtained to the Navier–Stokes equations, which were augmented by source terms used to represent plasma-induced body forces imparted by an actuator on the fluid. The numerical method utilized a high-fidelity time-implicit scheme, employing domain decomposition to carry out calculations on a parallel computing platform. A high-order overset grid approach preserved spatial accuracy in locally refined embedded regions. Features of the flowfields are described, and resultant solutions are compared to each other, with a previously obtained control case, and with the base line situation where no control was enforced.
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e-mail: donald.rizzetta@wpafb.af.mil
e-mail: miguel.visbal@wpafb.af.mil
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April 2008
Research Papers
Plasma-Based Flow-Control Strategies for Transitional Highly Loaded Low-Pressure Turbines
Donald P. Rizzetta,
e-mail: donald.rizzetta@wpafb.af.mil
Donald P. Rizzetta
Air Force Research Laboratory
, Computational Sciences Branch, Aeronautical Sciences Division, AFRL∕RBAC, Building 146, Room 225, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512
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Miguel R. Visbal
e-mail: miguel.visbal@wpafb.af.mil
Miguel R. Visbal
Air Force Research Laboratory
, Computational Sciences Branch, Aeronautical Sciences Division, AFRL∕RBAC, Building 146, Room 225, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512
Search for other works by this author on:
Donald P. Rizzetta
Air Force Research Laboratory
, Computational Sciences Branch, Aeronautical Sciences Division, AFRL∕RBAC, Building 146, Room 225, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512e-mail: donald.rizzetta@wpafb.af.mil
Miguel R. Visbal
Air Force Research Laboratory
, Computational Sciences Branch, Aeronautical Sciences Division, AFRL∕RBAC, Building 146, Room 225, 2210 Eighth Street, Wright-Patterson AFB, OH 45433-7512e-mail: miguel.visbal@wpafb.af.mil
J. Fluids Eng. Apr 2008, 130(4): 041104 (12 pages)
Published Online: April 4, 2008
Article history
Received:
June 21, 2007
Revised:
October 16, 2007
Published:
April 4, 2008
Citation
Rizzetta, D. P., and Visbal, M. R. (April 4, 2008). "Plasma-Based Flow-Control Strategies for Transitional Highly Loaded Low-Pressure Turbines." ASME. J. Fluids Eng. April 2008; 130(4): 041104. https://doi.org/10.1115/1.2903816
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