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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Effect of Nanosecond Repetitively Pulsed Discharges on the Dynamics of a Swirl-Stabilized Lean Premixed Flame

[+] Author and Article Information
D. A. Lacoste

Laboratoire EM2C, CNRS/UPR288,
Ecole Centrale Paris,
Grande Voie des Vignes,
Châtenay-Malabry 92295, France
e-mail: deanna.lacoste@ecp.fr

J. P. Moeck

Institut für Strömungsmechanik
und Technische Akustik,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: jonas.moeck@tu-berlin.de

T. Schuller

Laboratoire EM2C, CNRS/UPR288,
Ecole Centrale Paris,
Grande Voie des Vignes,
Châtenay-Malabry 92295, France

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 29, 2013; final manuscript received July 2, 2013; published online August 30, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(10), 101501 (Aug 30, 2013) (7 pages) Paper No: GTP-13-1208; doi: 10.1115/1.4024961 History: Received June 29, 2013; Revised July 02, 2013

The effects of nanosecond repetitively pulsed (NRP) plasma discharges on the dynamics of a swirl-stabilized lean premixed flame are experimentally investigated. Voltage pulses of 8 kV in amplitude and 10 ns in duration are applied at a repetition rate of 30 kHz. The average electric power deposited by the plasma is limited to 40 W, corresponding to less than 1% of the thermal power of 4 kW released by the flame. The investigation is carried out with a dedicated experimental setup that allows for studies of the flame dynamics with applied plasma discharges. A loudspeaker is used to acoustically perturb the flame and the discharges are generated between a central pin electrode and the rim of the injection tube. The velocity and CH* chemiluminescence signals are used to determine the flame transfer function, assuming that plasma discharges do not affect the correlation between the CH* emission and heat release rate fluctuations. Phase-locked images of the CH* emission show a strong influence of the NRP discharges on the flame response to acoustic perturbations, thus opening interesting perspectives for combustion control. An interpretation of the modifications observed in the transfer function of the flame is proposed by taking into account the thermal and chemical effects of the discharges. It is then demonstrated that by applying NRP discharges at unstable conditions, the oscillation amplitudes can be reduced by an order of magnitude, thus effectively stabilizing the system.

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Figures

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Fig. 1

Experimental setup with optical diagnostics

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Fig. 2

Burner equipped with a loudspeaker and an NRP discharge generator

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Fig. 3

Photographic representation of the burner with a lean premixed CH4-air swirl-stabilized flame (blue) and NRP discharges (purple)

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Fig. 4

Time-averaged Abel-inverted images of the CH* emission (a) without, and (b) with NRP discharges (Φ = 0.7, thermal power of the flame 4 kW, swirl number 0.53)

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Fig. 5

Flame transfer function of a swirl-stabilized CH4-air flame (Φ = 0.7, thermal power of the flame 4 kW, swirl number 0.53): without (black circles), and with (red squares) NRP discharges (30 kHz PRF, 40 W plasma power)

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Fig. 6

Phase-averaged Abel-inverted images of the CH* emission examined at a forcing frequency of 128 Hz, without (top), and with (bottom) NRP discharges (Φ = 0.7, thermal power of the flame 4 kW, swirl number 0.53)

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Fig. 7

Time-averaged Abel-inverted images of the CH* emission for the unstable case (a) without, and (b) with NRP discharges

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Fig. 8

Top frame: sample time trace of the velocity measured by the hot wire with and without NRP plasma discharges. Bottom frame: corresponding power spectral densities.

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