Full Content is available to subscribers

Subscribe/Learn More  >

Impact of Water Injection on Thermoacoustic Modes in a Lean Premixed Combustor Under Atmospheric Conditions

[+] Author Affiliations
Nicolai V. Stadlmair, Payam Mohammadzadeh Keleshtery, Max Zahn, Thomas Sattelmayer

Technische Universität München, Garching, Germany

Paper No. GT2017-63342, pp. V04AT04A026; 13 pages
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4A: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5084-8
  • Copyright © 2017 by ASME


The goal of the study presented in this paper is to analyze how the stability margin of a premixed combustor changes when liquid water is injected. Within the scope of this work, experimental results are presented and serve as a validation basis for a numerical model of the combustor. Experiments comprise qualitative as well as quantitative analyses by means of damping rate measurements under varying water-to-fuel ratios. For this purpose, a natural gas fueled low-NOX burner which is equipped with a coaxially placed water injection system is operated in a single burner test rig under atmospheric conditions. Water-to-fuel ratios investigated in this study range between 0 and 2 whereby either the adiabatic flame temperature or the equivalence ratio is held constant. With technical applications in mind, the former case is chosen to represent the conditions occurring in a gas turbine combustor when the thermal output is increased at a constant flame temperature level. A recently developed approach is applied to extract the net damping rates of the occurring modes from dynamic pressure measurements. More specifically, the autocorrelation function of the combustion noise signal is evaluated by an algorithm based on Bayesian statistics to ensure for robust extraction of the complex eigenfrequencies. Beyond that, the dynamic system response is measured for various operating conditions with and without water injection by means of Scattering Matrices (SM) using the Multi-Microphone Method (MMM). Measured SM’s are deployed in a numerical model of the combustor and acoustic conservation equations are solved in frequency space using a Finite Element (FEM) approach. The results are, on the one hand, evaluated to analyze occurring thermoacoustic modes by comparing its spatial distribution with experiments. On the other hand, eigenvalue studies are carried out and experimentally identified eigenfrequencies and damping rates are used to benchmark the results of the numerical analyses.

Copyright © 2017 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In