Ground-based gas turbines are responsible for generating a significant amount of electric power as well as providing mechanical power for a variety of applications. This is due to their high efficiency, high power density, high reliability, and ability to operate on a wide range of fuels. Due to increasingly stringent air quality requirements, stationary power gas turbines have moved to lean-premixed operation. Lean-premixed operation maintains low combustion temperatures for a given turbine inlet temperature, resulting in low NOx emissions while minimizing emissions of CO and hydrocarbons. In addition, to increase overall cycle efficiency, engines are being operated at higher pressure ratios and/or higher combustor inlet temperatures. Increasing combustor inlet temperatures and pressures in combination with lean-premixed operation leads to increased reactivity of the fuel/air mixture, leading to increased risk of potentially damaging flashback. Curtailing flashback on engines operated on hydrocarbon fuels requires care in design of the premixer. Curtailing flashback becomes more challenging when fuels with reactive components such as hydrogen are considered. Such fuels are gaining interest because they can be generated from both conventional and renewable sources and can be blended with natural gas as a means for storage of renewably generated hydrogen. The two main approaches for coping with flashback are either to design a combustor that is resistant to flashback, or to design one that will not anchor a flame if a flashback occurs. An experiment was constructed to determine the flameholding tendencies of various fuels on typical features found in premixer passage ways (spokes, steps, etc.) at conditions representative of a gas turbine premixer passage way. In the present work, tests were conducted for natural gas and hydrogen between 3 and 9 atm, between 530 K and 650 K, and free stream velocities from 40 to 100 m/s. Features considered in the present study include a spoke in the center of the channel and a step at the wall. The results are used in conjunction with existing blowoff correlations to evaluate flameholding propensity of these physical features over the range of conditions studied. The results illustrate that correlations that collapse data obtained at atmospheric pressure do not capture trends observed for spoke and wall step features at elevated pressure conditions. Also, a notable fuel compositional effect is observed.

References

References
1.
Lieuwen
,
T.
,
McDonell
,
V.
,
Santavicca
,
D.
, and
Sattelmayer
,
T.
,
2008
, “
Burner Development and Operability Associated With Steady Flowing Syngas Fired Combustors
,”
Combust. Sci. Technol.
,
180
(6)
, pp.
1169
1192
.10.1080/00102200801963375
2.
Chaudhuri
,
S.
,
Kosta
,
S.
,
Renfro
,
M. W.
, and
Cetegen
,
B. M.
,
2010
, “
Blowoff Dynamics of Bluff Body Stabilized Turbulent Premixed Flames
,”
Combust. Flame
,
157
(4)
, pp.
790
802
.10.1016/j.combustflame.2009.10.020
3.
Shanbhogue
,
S. J.
,
Husain
,
S.
, and
Lieuwen
,
T.
,
2010
, “
Lean Blowoff of Bluff Body Stabilized Flames: Scaling and Dynamics
,”
Prog. Energy Combust. Sci.
,
35
(1)
, pp.
98
120
.10.1016/j.pecs.2008.07.003
4.
Noble
,
D. R.
,
Quingquo
,
Z.
,
Akbar
,
S.
,
Tootle
,
J.
,
Meyers
,
A.
, and
Lieuwen
,
T.
,
2006
, “
Syngas Mixture Composition Effects Upon Flashback and Blowoff
,”
ASME
Paper No. GT2006-90470.10.1115/GT2006-90470
5.
Subramanya
,
M.
,
Davu
,
D. S.
, and
Choudhuri
,
A.
,
2005
, “
Experimental Investigation on the Flame Extinction Limit of Fuel Blends
,”
AIAA
Paper No. 2005-374.10.2514/6.2005-374
6.
Rizk
,
N. K.
, and
Lefebvre
,
A. H.
,
1986
, “
Relationship Between Flame Stability and Drag of Bluff-Body Flameholders
,”
J. Propul. Power
,
2
(
4
), pp.
361
365
.10.2514/3.22895
7.
Leonard
,
P. A.
, and
Mellor
,
A. M.
,
1983
, “
Correlation of Lean Blowoff of Gas Turbine Combustors Using Alternative Fuels
,”
J. Energy
,
7
(
6
), pp.
729
732
.10.2514/3.62722
8.
Ballal
,
D. R.
, and
Lefebvre
,
A. H.
,
1979
, “
Weak Extinction Limits of Turbulent Flowing Mixtures
,”
ASME J. Eng. Gas Turbines Power
,
101
(
3
), pp.
343
348
.10.1115/1.3446582
9.
Wright
,
F. H.
,
1959
, “
Bluff-Body Stabilization: Blockage Effects
,”
Combust. Flame
,
3
, pp.
319
337
.10.1016/0010-2180(59)90035-5
10.
Zukoski
,
E. E.
, and
Marble
,
F. E.
,
1955
, “
The Role of Wake Transition in the Process of Flame Stabilization on Bluff Bodies
,”
AGARD Combustion Research and Reviews
,
Butterworth Scientific Publishers
,
London
, pp.
167
180
.
11.
DeZubay
,
E. A.
,
1950
, “
Characteristics of Disk-Controlled Flames
,”
Aero Dig.
,
54
(
6
), pp.
102
104
.
12.
Huelmantel
,
L. W.
,
Ziemer
,
R. W.
, and
Cambel
,
A. B.
,
1957
, “
Stabilization of Premixed Propane–Air Flames in Recessed Ducts
,”
Jet Propul.
,
27
(
1
), pp.
31
34
.10.2514/8.12565
13.
Katta
,
V. R.
, and
Roquemore
,
W. M.
,
1998
, “
Numerical Studies on Trapped-Vortex Concepts for Stable Combustion
,”
ASME J. Eng. Gas Turbines Power
,
120
(
1
), pp.
60
68
.10.1115/1.2818088
14.
Choudhury
,
P. R.
, and
Cambel
,
A. B.
,
1961
, “
Flame Stabilization by Wall Recesses
,”
Symp. (Int.) Combust.
,
8
(1), pp.
963
970
.10.1016/S0082-0784(06)80592-8
15.
Potter
,
A.
, and
Wong
,
E.
,
1958
, “
Effect of Pressure and Duct Geometry on Bluff-Body Flame Stabilization
,” National Advisory Committee for Aeronautics, Washington, DC, NACA Technical Note No. 4381.
16.
Leong
,
M. Y.
,
Smugeresky
,
C. S.
,
McDonell
,
V. G.
, and
Samuelsen
,
G. S.
,
2001
, “
Rapid Liquid Fuel Mixing for Lean Burning Combustors: Low Power Performance
,”
ASME J. Eng. Gas Turbines Power
,
123
(
3
), pp.
574
579
.10.1115/1.1362318
17.
Nakamura
,
S.
,
McDonell
,
V. G.
, and
Samuelsen
,
G. S.
,
2008
, “
The Effect of Liquid–Fuel Preparation on Gas Turbine Emissions
,”
ASME J. Eng. Gas Turbines Power
,
130
(
2
), p.
02156
.10.1115/1.2771564
18.
Beerer
,
D. J.
, and
McDonell
,
V. G.
,
2008
, “
Autoignition of Hydrogen and Air in a Continuous Flow Reactor With Application to Premixed Combustion
,”
ASME J. Eng. Gas Turbines Power
,
130
(
5
), p.
051507
.10.1115/1.2939007
19.
Beerer
,
D. J.
,
McDonell
,
V. G.
,
Therkelsen
,
P.
, and
Cheng
,
R. K.
,
2013
, “
Flashback and Turbulent Flame Speed Measurements in Hydrogen/Methane Reactions Stabilized by a Low-Swirl Injector at Elevated Pressures and Temperatures
,”
ASME J. Eng. Gas Turbines Power
,
136
(
3
), p.
031502
.10.1115/1.4025636
20.
Beerer
,
D.
,
McDonell
,
V.
, and
Samuelsen
,
S.
,
2011
, “
An Experimental Ignition Delay Study of Alkane Mixtures in Turbulent Flows at Elevated Pressures and Intermediate Temperatures
,”
ASME J. Eng. Gas Turbines Power
,
133
(
1
), p.
011502
.10.1115/1.4001981
21.
Burcat
,
A.
,
Scheller
,
K.
, and
Lifshitx
,
A.
,
1971
, “
Shock-Tube Investigation of Comparative Ignition Delay Times for C1–C5 Alkanes
,”
Combust. Flame
,
16
(1)
, pp.
29
33
.10.1016/S0010-2180(71)80007-X
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