Abstract
The nonlinear response of a swirl-stabilized flame to equivalence ratio oscillations was experimentally investigated in an atmospheric-pressure, high-temperature, lean-premixed model gas turbine combustor. To generate high-amplitude equivalence ratio oscillations, fuel was modulated using a siren type modulating device. The mixture ratio oscillations at the inlet of the combustion chamber were measured by the infrared absorption technique and the flame's response, i.e., the fluctuation in the flame's rate of heat release, was estimated by CH chemiluminescence emission intensity. Phase-resolved CH chemiluminescence images were taken to characterize the dynamic response of the flame. Results show that the amplitude and frequency dependence of the flame's response to equivalence ratio oscillations is qualitatively consistent with the flame's response to inlet velocity oscillations. The underlying physics of the nonlinear response of the flame to equivalence ratio oscillations, however, is associated with the intrinsically nonlinear dependence of the heat of reaction and burning velocity on the equivalence ratio. It was found that combustion cannot be sustained under conditions of high amplitude equivalence ratio oscillations. Lean blowoff occurs when the normalized amplitude of the equivalence ratio oscillation exceeds a threshold value. The threshold value is dependent on the mean equivalence ratio and modulation frequency.
| Original language | English (US) |
|---|---|
| Title of host publication | ASME Turbo Expo 2010 |
| Subtitle of host publication | Power for Land, Sea, and Air, GT 2010 |
| Pages | 833-842 |
| Number of pages | 10 |
| Edition | PARTS A AND B |
| DOIs | |
| State | Published - Dec 1 2010 |
| Event | ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow, United Kingdom Duration: Jun 14 2010 → Jun 18 2010 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Number | PARTS A AND B |
| Volume | 2 |
Other
| Other | ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 |
|---|---|
| Country | United Kingdom |
| City | Glasgow |
| Period | 6/14/10 → 6/18/10 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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Experimental investigation of the nonlinear response of swirl stabilized flames to equivalence ratio oscillations. / Kim, Kyu Tae; Lee, Jong Guen; Quay, Bryan David; Santavicca, Domenic A.
ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010. PARTS A AND B. ed. 2010. p. 833-842 (Proceedings of the ASME Turbo Expo; Vol. 2, No. PARTS A AND B).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Experimental investigation of the nonlinear response of swirl stabilized flames to equivalence ratio oscillations
AU - Kim, Kyu Tae
AU - Lee, Jong Guen
AU - Quay, Bryan David
AU - Santavicca, Domenic A.
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The nonlinear response of a swirl-stabilized flame to equivalence ratio oscillations was experimentally investigated in an atmospheric-pressure, high-temperature, lean-premixed model gas turbine combustor. To generate high-amplitude equivalence ratio oscillations, fuel was modulated using a siren type modulating device. The mixture ratio oscillations at the inlet of the combustion chamber were measured by the infrared absorption technique and the flame's response, i.e., the fluctuation in the flame's rate of heat release, was estimated by CH chemiluminescence emission intensity. Phase-resolved CH chemiluminescence images were taken to characterize the dynamic response of the flame. Results show that the amplitude and frequency dependence of the flame's response to equivalence ratio oscillations is qualitatively consistent with the flame's response to inlet velocity oscillations. The underlying physics of the nonlinear response of the flame to equivalence ratio oscillations, however, is associated with the intrinsically nonlinear dependence of the heat of reaction and burning velocity on the equivalence ratio. It was found that combustion cannot be sustained under conditions of high amplitude equivalence ratio oscillations. Lean blowoff occurs when the normalized amplitude of the equivalence ratio oscillation exceeds a threshold value. The threshold value is dependent on the mean equivalence ratio and modulation frequency.
AB - The nonlinear response of a swirl-stabilized flame to equivalence ratio oscillations was experimentally investigated in an atmospheric-pressure, high-temperature, lean-premixed model gas turbine combustor. To generate high-amplitude equivalence ratio oscillations, fuel was modulated using a siren type modulating device. The mixture ratio oscillations at the inlet of the combustion chamber were measured by the infrared absorption technique and the flame's response, i.e., the fluctuation in the flame's rate of heat release, was estimated by CH chemiluminescence emission intensity. Phase-resolved CH chemiluminescence images were taken to characterize the dynamic response of the flame. Results show that the amplitude and frequency dependence of the flame's response to equivalence ratio oscillations is qualitatively consistent with the flame's response to inlet velocity oscillations. The underlying physics of the nonlinear response of the flame to equivalence ratio oscillations, however, is associated with the intrinsically nonlinear dependence of the heat of reaction and burning velocity on the equivalence ratio. It was found that combustion cannot be sustained under conditions of high amplitude equivalence ratio oscillations. Lean blowoff occurs when the normalized amplitude of the equivalence ratio oscillation exceeds a threshold value. The threshold value is dependent on the mean equivalence ratio and modulation frequency.
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U2 - 10.1115/GT2010-23023
DO - 10.1115/GT2010-23023
M3 - Conference contribution
AN - SCOPUS:82055204923
SN - 9780791843970
T3 - Proceedings of the ASME Turbo Expo
SP - 833
EP - 842
BT - ASME Turbo Expo 2010
ER -