Flame stabilization with nanosecond repetitively pulsed discharge in a sequential combustor
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2022-01
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Conference Paper
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Abstract
This paper describes the experimental results of the flame dynamics stabilized by nanosecond repetitively pulsed discharge (NRPD) in a sequential combustor configuration. In such configuration of the combustor, two flame regions are organized sequentially: (i) first stage flame and (ii) second-stage sequential flame placed downstream of the first one. The sequential flame is located downstream of the injection of the dilution air and the second stage fuel into the hot vitiated products of the first stage flame. Several operation conditions of the second stage flame were considered in the present paper. The parameters of the first stage flame and amount of the dilution air were fixed while the second stage fuel injection was composed of natural gas/H2 mixture with different fractions of hydrogen. It is shown that the flame anchoring and combustion dynamics is significantly affected by the amount of hydrogen and mean power of the NRPD. Thermal effect of the plasma was studied with optical emission spectroscopy. Namely, the temperature increase due to the fast gas heating was measured during applied high-voltage pulses. It was shown that, for a mean vitiated flow temperature of 1000K, the temperature increase due to nanosecond pulse discharge can reach up to 2100K. The coupling of the gas flow with NRPD was identified for different frequencies and amplitudes of applied pulses. It was found that for high pulse repetition frequency (PRF>40 kHz) the discharge propagation and the parameter of the plasma have a cumulative effect. Spatially resolved electron density and mean gas temperature in the plasma region were measured in order to characterize the flow-discharge coupling in the flow direction. High speed OH chemiluminescence is used for quantitative analysis of the ignition and stabilization of the second stage flame.
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American Institute of Aeronautics and Astronautics
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AIAA SCITECH Forum 2022
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09471 - Noiray, Nicolas / Noiray, Nicolas
Notes
Conference lecture held on January 5, 2022
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820091 - ThermoacOustic instabilities contRol in sequential Combustion cHambers (EC)