Equivalence ratio variation and combustion instability in hybrid rocket

Lee, Dong‐Eun; Lee, Changjin

doi:10.1007/s12206-019-0942-5

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The switching of CH* chemiluminescence frequency is accompanied by sound pressure, which further proved that chamber length or thermal power are independent variables of thermoacoustic instability. With the proper design of the combustion chamber geometrical structures, thermoacoustic instability can be better suppressed [35,36]. Different operating conditions will bring challenges to the modeling of thermoacoustic instability [37][38][39][40][41], thus the analyzing methods and transfer functions of combustion instability maybe changed at the same time [42].…”

Section: Variation Of Combustion Instabilitymentioning

confidence: 99%

Effects of operating parameters on the combustion oscillation behaviour in a lean premixed CH4 combustor

Tao

Zhou

2021

J Mech Sci Technol

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This article experimentally studies the influence of operating parameters on thermoacoustic instability in a lean premixed combustor. The combustion chamber length and methane flow rate were selected as the operating parameter. Experimental results show that the flame experienced different oscillation modes as the combustion chamber length varies. With the nonlinear time-series analyzing tools, such as phase space reconstruction or recurrence plot, the dynamic characteristics of thermoacoustic instability can be acquired. As the methane flow rate increased from 2.0 L/min to 4.5 L/min, the thermoacoustically flame evolves from a chaotic state to a limit cycle state. There exists extreme oscillation point as the combustion chamber length increased from 100 mm to 800 mm. The maximum thermoacoustic instability point occurred at 600 mm. The flame shape is tightly connected with the thermoacoustic instability process, and a hollow inner recirculation region emerged. This article can promote the application of passive control methods in the prevention of combustion instability.

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Section: Variation Of Combustion Instabilitymentioning

confidence: 99%

Effects of operating parameters on the combustion oscillation behaviour in a lean premixed CH4 combustor

Tao

Zhou

2021

J Mech Sci Technol

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“…The interaction between the flame and the sound waves will form unsteady flow oscillations in the combustion chamber [3]. The intensity and amplitude of thermoacoustic instability will continue to grow, which will damage the structure of the combustion chamber or affecting the normal combustion of the burner [4]. Thermoacoustic instability will cause serious structural damages, thermal stresses damages and abnormal phenomena such as flashback and blowout [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of oxy jet in cross-flow on the combustion instability and NOx emissions in lean premixed flame

Tao

Zhou

2022

THERM SCI

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Combustion instability and nitrogen oxides emission are crucial factors for modern gas turbine combustors, which seriously hampers the research and development of advanced combustors. To eliminate combustion instability and NOx emissions simultaneously, effects of the ?Oxy? (CO2/O2, N2/O2, Ar/O2and He/O2) jet in cross flow(JICF)on combustion instability and NOx emissions are experimentally studied. In this research, the flow rate and oxygen ratio of the combustor are varied to evaluate the control effectiveness. Results denotes that all the four oxy fuel gas: CO2/O2, N2/O2, Ar/O2and He/O2, could suppress combustion instability and NOx emissions. The CO2/O2dilution can achieve a better damping results than the other three cases. There are peak values or lowest points of sound pressure amplitude as the parameter of ?Oxy? JICF changes. Mode transition appears in both acoustic signal and CH* chemiluminescence of the flame. But the turning point of mode transition is different. Under the CO2/O2cases, the NOx emission decreases from 22.3ppm to 15.2ppm, the damping ratio of NOxis 40.39%. The flame shape and length were changed under different JICF dilutions. This research could promote the application of jet in cross flow methods on combustion instability or pollutant emissions in gas turbines.

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Controlling Low-Frequency Instability with Fuel Inserts in Hybrid Rocket Combustion

Chae

Lee

2021

Journal of Propulsion and Power

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Equivalence ratio variation and combustion instability in hybrid rocket

Cited by 5 publications

References 11 publications

Effects of operating parameters on the combustion oscillation behaviour in a lean premixed CH4 combustor

Effects of operating parameters on the combustion oscillation behaviour in a lean premixed CH4 combustor

Effects of oxy jet in cross-flow on the combustion instability and NOx emissions in lean premixed flame

Controlling Low-Frequency Instability with Fuel Inserts in Hybrid Rocket Combustion

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