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Investigation of Combustion Instability in a Single Annular Combustor

Ichihashi, Fumitaka
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1299617901

Abstract Details

2011, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
The well known criterion for combustion instability is called the Rayleigh’s criterion. It indicates that, for combustion instability to occur, the heat release rate (q’) and pressure oscillation (p’) must be in phase. This thesis describes measurement techniques and study methods for combustion instabilities that occurred in the prototype single annular sector Rich-Burn Quick-Mix Lean-Burn (RQL) combustor on the original (short) and new (long) experimental rig configuration with a focus on q’ and p’ measurements. A change in the configuration of the combustor rig was necessary in order to acquire more precise measurements of forward- and backward-moving acoustic pressure waves within the rig by mounting pressure transducers on preselected locations of the upstream duct, downstream duct and combustion area. Pressure transducers provided such local pressure behaviors as amplitude and frequency per location, also in addition to transfer functions that allow for the calculation of the acoustic impedance at any location within the combustor rig. A high-speed camera was capable of filming a chemiluminescene image, i.e., the rate of heat release through a quartz window that is mounted on the side of the combustor. Two imaging analysis techniques, Proper Orthogonal Decomposition and Fourier Transformation, were applied to the chemiluminescene image obtained by a high-speed video device. Two different test cases were investigated. Both a high and low fuel-to-air ratio were used for the investigation of the Rayleigh’s criterion, which was confirmed by the corresponding q’ and p’ data sets. Finally, the resonance frequency that agrees with combustion instability was well predicted by utilizing the one-dimensional wave propagation theory and the known geometry of the combustor rig, temperature of fluid, and boundary conditions.
San-Mou Jeng, PhD (Committee Chair)
Shanwu Wang, PhD (Committee Member)
Kelly Cohen, PhD (Committee Member)
Asif Syed, PhD (Committee Member)
187 p.
Aerospace Materials
Combustion Instability; POD; RQL; Proper Orthogonal Decomposition; Combustion Acoustic; Rayleigh's Criterion

Recommended Citations

Citations

  • Ichihashi, F. (2011). Investigation of Combustion Instability in a Single Annular Combustor [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1299617901

    APA Style (7th edition)

  • Ichihashi, Fumitaka. Investigation of Combustion Instability in a Single Annular Combustor. 2011. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1299617901.

    MLA Style (8th edition)

  • Ichihashi, Fumitaka. "Investigation of Combustion Instability in a Single Annular Combustor." Master's thesis, University of Cincinnati, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1299617901

    Chicago Manual of Style (17th edition)

ucin1299617901
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This open access ETD is published by University of Cincinnati and OhioLINK.