Pulse combustion: The quantification of characteristic times

Keller, Jay O.; Bramlette, T.T.; Westbrook, Charles K.; Dec, John E.

doi:10.1016/0010-2180(90)90040-x

Cited by 84 publications

(21 citation statements)

References 11 publications

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“…noting the visual similarity between the 100 percent natural gas map For practical applications, these data suggest that it is important to at 339 K (150 F) (Figure 5c) and Figure 9. An exact characterization test combustor stability with a recognition that ambient conditions and of the reaction and advection times (as in Keller et al 1990) is needed fuel composition may play an important role. Operation of a comto make a definitive conclusion about the role of the reaction time.…”

Section: Fuel Compositionmentioning

confidence: 99%

“…After a short time, the nozzle velocity would again increase as the combustor pressure drops, thereby injecting the accumulated mixture from the nozzle into the flame. If the resulting heat release and pressure fluctuation are in phase, the oscillation will To interpret the data, we modify an approach described by Keller et al (1989Keller et al ( , 1990. Keller showed that oscillating, premixed (pulse) combustion could be characterized by a fluid dynamic mixing time and by a chemical reaction time.…”

Section: Introductionmentioning

confidence: 99%

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Effects of ambient conditions and fuel composition on combustion stability

Janus¹,

Richards²,

Yip³

et al. 1997

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Recent regulations on NO emissions are promoting the use of x lean premix (LPM) combustion for industrial gas turbines. LPM combustors avoid locally stoichiometric combustion by premixing fuel and air upstream of the reaction region, thereby eliminating the high temperatures that produce thermal NO . Unfortunately, this style of comx bustor is prone to combustion oscillation. Significant pressure fluctuations can occur when variations in heat release periodically couple to acoustic modes in the combustion chamber. These oscillations must be controlled because resulting vibration can shorten the life of engine hardware. Laboratory and engine field testing have shown that instability regimes can vary with environmental conditions. These observations prompted this study of the effects of ambient conditions and fuel composition on combustion stability. Tests are conducted on a subscale combustor burning natural gas, propane, and some hydrogen/ hydrocarbon mixtures. A premix, swirl-stabilized fuel nozzle typical hardware (Cutrone et al. 1985). of industrial gas turbines is used. Experimental and numerical results Changes in instability behavior are typically attributed to combusdescribe how stability regions may shift as inlet air temperature, tor modifications or changes in operating conditions. In addition, humidity, and fuel composition are altered. Results appear to indicate laboratory and engine field testing have shown that instability regimes that shifting instability regimes are primarily caused by changes in can also change with environmental conditions and fuel composition. reaction rate.These field observations have seldom been reported in the literature.

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Section: Fuel Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of ambient conditions and fuel composition on combustion stability

Janus¹,

Richards²,

Yip³

et al. 1997

View full text Add to dashboard Cite

show abstract

“…A comprehensive review of spontaneous ignition based on equation (6) has been presented by Kanury (1984). Keller et al (1990) have made a similar analysis for the combustion of methane gas. A simple one-step reaction rate model for CH,(g) as the fuel is…”

Section: Spontaneous Ignition Delaymentioning

confidence: 99%

“…The activation energy E is about 120 kJ/mol. According to the calculations made by Keller et al (1990), the magnitude of the chemical ignition delay time was 0.5-1.0 ms. Keller and Westbrook (1987) found that, if the chemical ignition time was too short, the pulse combustor did not operate stably.…”

Section: Spontaneous Ignition Delaymentioning

confidence: 99%

Thermodynamic analysis of a pulse combustion system and its application to gas turbines

Lampinen¹,

Turunen²,

Köykkä³

1992

Int. J. Energy Res.

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The study describes a special construction of a pulsating self-compressing combustion system, which gives nearly constant inand outflows of gas, and its use in connection with gas turbine power stations. The main idea of the selfcompressing combustion chamber is that the pressure at the outflow after combustion is higher than that at the inflow to the combustion chamber. The maximum thermodynamically possible pressure rise in the combustion chamber is solved and calculated for different temperature ratios and combustion processes. The thermodynamic advantage of pulse combustion for gas turbine systems is shown as a function of the self-compression pressure ratio.

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“…To interpret the data, we modify an approach described by Keller et al (1989Keller et al ( , 1990. Keller showed that oscillating, premixed (pulse) combustion mild be characterized by a fluid dynamic mixing time and by a chemical reaction time.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ambient Conditions and Fuel Composition on Combustion Stability

Janus¹,

Richards²,

Yip³

et al. 1997

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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Recent regulations on NO ' emissions are promoting the use of lean premix (L2M) combustion for industrial gas turbines. LPM combustors avoid locally stoichiometric combustion by premixing fuel and air upstream of the reaction region, thereby eliminating the high temperatures that produce thermal NO,. Unfortunately, this style of combustor is prone to combustion oscillation. Significant pressure fluctuations can occur when variations in heat release periodically couple to acoustic modes in the combustion. chamber. These oscillations must be controlled because resulting vibration can shorten the life of engine hardware.Laboratory and engine field testing have shown that instability regimes can vary with environmental conditions. These observedons prompted this study of the effects of ambient conditions and fuel composition on combustion stability. Tests are conducted on a subscale combustor burning natural gas, propane, and some hydrogen/ hydrocarbon mixtures. A premix, swirl-stabilized fuel nozzle typical of industrial gas turbines is used. Experimental and numerical results describe how stability legions may shift as inlet air temperature, humidity, and fuel composition are altered. Results appear to indicate that shifting instability regimes are primarily caused by changes in reaction rate.

show abstract

Pulse combustion: The quantification of characteristic times

Cited by 84 publications

References 11 publications

Effects of ambient conditions and fuel composition on combustion stability

Effects of ambient conditions and fuel composition on combustion stability

Thermodynamic analysis of a pulse combustion system and its application to gas turbines

Effects of Ambient Conditions and Fuel Composition on Combustion Stability

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