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Research Papers: Flows in Complex Systems

Plasma-Based Flow-Control Strategies for Transitional Highly Loaded Low-Pressure Turbines

[+] Author and Article Information
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 45433-7512donald.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 45433-7512miguel.visbal@wpafb.af.mil

J. Fluids Eng 130(4), 041104 (Apr 04, 2008) (12 pages) doi:10.1115/1.2903816 History: Received June 21, 2007; Revised October 16, 2007; Published April 04, 2008

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.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of plasma actuator and geometry for empirical plasma-force model

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Figure 2

Schematic representation of the turbine blade configuration

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Figure 3

Turbine blade computational mesh system

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Figure 4

Actuator configurations

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Figure 5

Time-mean surface pressure coefficient distributions for counterflow actuation

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Figure 6

Time-mean velocity magnitude profiles for counterflow actuation

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Figure 7

Time-mean planar contours of u velocity, streamlines, and planar contours of Cp for counterflow actuation

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Figure 8

Root-mean-square fluctuating velocity magnitude profiles for counterflow actuation

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Figure 9

Instantaneous planar contours of u velocity, planar contours of spanwise vorticity, and contours of spanwise vorticity on the blade surface for counterflow actuation

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Figure 10

Trailing edge surface pressure time history for counterflow actuation

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Figure 11

Turbulent kinetic energy frequency spectra for counterflow actuation Configuration B

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Figure 12

Time-mean surface pressure coefficient distributions for spanwise actuation

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Figure 13

Time-mean planar contours of u velocity, streamlines, and planar contours of Cp for spanwise actuation

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Figure 14

Planar contours of the x and y plasma-force components, and the resultant plasma-force vector for counterflow actuation Configuration A with various plasma-force models

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Figure 15

Time-mean surface pressure coefficient distributions for counterflow actuation Configuration A with various plasma-force models

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Figure 16

Time-mean planar contours of u velocity, streamlines, and planar contours of Cp for counterflow actuation Configuration A with various plasma-force models

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