TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Investigation of the Response of an Air Blast Atomizer Combustion Chamber Configuration on Forced Modulation of Air Feed at Realistic Operating Conditions

[+] Author and Article Information
C. Hassa, J. Heinze, K. Stursberg

Institute of Propulsion Technology, German Aerospace Center, Linder Höhe, 51147 Köln, Germany

J. Eng. Gas Turbines Power 125(4), 872-878 (Nov 18, 2003) (7 pages) doi:10.1115/1.1584478 History: Received December 01, 2001; Revised March 01, 2002; Online November 18, 2003
Copyright © 2003 by ASME
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Schematic representation of the single sector combustor
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Airblast atomizers; on the left: MTU 1 (for wall attached flames); on the right: MTU 2 (for lifted flames)
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FFT peak amplitudes at forced frequencies of plenum and flame tube pressure
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FFT amplitudes ratio of OH* emission (top) and flame tube pressure (bottom) related to plenum pressure
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Measured primary air flow rate as function of forcing frequency
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Measured volumetric OH* distributions (top) and deconvoluted spatially resolved OH* distributions (bottom) of a wall attached flame (left) and of a lifted flame (right) at Tpreheat=700 K, AFR=25 and p=9 bar
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OH* chemiluminescence of a forced combustion oscillation at 295 Hz of the wall attached flame at 9 bar. The average and the periodic fluctuation of all phase resolved images are shown.
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Resonance frequencies according to PMT signal for all operating conditions; marked are the different injectors and preheat temperatures
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Resonance frequencies according to ratio pflame tube/pplenum for all operating conditions; marked are the different preheat temperatures
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Averaged OH* chemiluminescence of the detached flame at 9 bar, AFR 25, and 450 K preheat temperature
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Phase resolved OH* chemiluminescence of a forced combustion oscillation at 295 Hz of a detached flame at 9 bar (AFR 25, 700 K air preheat temperature) and averaged over 600 single images
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Periodic fluctuations of the OH* chemiluminescence for a detached flame at 9 bar for the different oscillation frequencies of 22 Hz–696 Hz. The detached flame (MTU 2 nozzle) burns at an AFR of 25 and an air preheating of 700 K.



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