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Combustion Instabilities in a Lean Premixed Pre-Vaporized Combustor at High-Pressure High-Temperature

[+] Author Affiliations
Xiao Han, Xin Hui, Chi Zhang, Yuzhen Lin

Beihang University, Beijing, China

Pei He

AVIC Commercial Aircraft Engine Co., Ltd., Shanghai, China

Chih-Jen Sung

University of Connecticut, Storrs, CT

Paper No. GT2017-65190, pp. V04BT04A072; 10 pages
doi:10.1115/GT2017-65190
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5085-5
  • Copyright © 2017 by ASME

abstract

Experimental results correlating combustion instability and staging ratio in a RP-3 fueled lean premixed pre-vaporized (LPP) combustor is presented. All the experiments are operated at high-pressure and high-temperature conditions, and processed data has been collected and classified by the staging ratio. A low-frequency oscillation is found in the conditions that the main stage and pilot stage work together. There are two discrete frequencies laying in 50∼120 Hz and 420∼470 Hz, the former changes with staging ratio (SR) while the latter remains constant. Sensitivity analysis of flame model reveals that the low-frequency oscillation at 50∼120 Hz is highly suspected to be caused by an intrinsic mode of this combustor. RANS simulation of flame structure finds that delay time could be extended by decreasing SR, which is consistent with the theoretical analysis.

Copyright © 2017 by ASME

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