Excitation of high frequency thermoacoustic oscillations by syngas in a non-premixed bluff body combustor

Baraiya, Nikhil A.; Chakravarthy, Satyanarayanan R.

doi:10.1016/j.ijhydene.2019.04.087

Cited by 18 publications

(1 citation statement)

References 53 publications

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“…However, at t > 3.9 s, the phase difference is changed to be −76.6°. This phase change/shift is the main reason why the combustion-driven oscillations [50,51] are attenuated somehow but smaller-amplitude limit cycles are still present, even with the heat exchangers temperature increased. The phase difference change is due to the change of the heat exchangers from absorbing heat to releasing heat to the surrounding flow.…”

Section: Heat Exchangers Impact On Limit Cycle and Nox Emissionmentioning

confidence: 99%

NOx emission reduction reaction of ammonia-hydrogen with self-sustained pulsating oscillations

Zhao

et al. 2020

Thermal Science and Engineering Progress

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Unlike hydrocarbon fuel, ammonia (NH 3) is an alternative but promising carbon-free renewable fuel. The utilization of NH 3 as energy resource can effectively reduce greenhouse gas CO 2 emission. Here we explore interdisciplinary physics of ammonia-hydrogen-fueled combustion-sustained pulsating oscillations and its impact on NOx emission via numerical simulations. A longitudinal combustor with both ends acoustically open is developed. The premixed flame and constant-temperature heat exchangers are implemented upstream and downstream. With the model validated, it is applied to gain insights on the effects of 1) the mass flow rate of the fuel mixture, 2) the hydrogen mass fraction relative to the fuel mixture, and 3) the temperature T H of the heat exchangers. It is found that nonlinear pulsating oscillations could be generated, depending on Furthermore, the oscillation amplitude and frequency are shown to strongly depend on and. In addition, as is reduced from 45% to 15%, intermittent oscillations with a period of 10 0 s are observed to superimpose on the acoustic resonance nature of the combustor with a time scale of 10 −2 s. Finally, varying temperatures of the heat exchanger are found to affect NOx generation and decrease the amplitude of the pulsating oscillations somehow.

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Section: Heat Exchangers Impact On Limit Cycle and Nox Emissionmentioning

confidence: 99%

NOx emission reduction reaction of ammonia-hydrogen with self-sustained pulsating oscillations

Zhao

et al. 2020

Thermal Science and Engineering Progress

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Effect of Fuel Composition on Thermoacoustic Instability in a Turbulent Combustor

Baraiya

Chakravarthy

2021

Lecture Notes in Mechanical Engineering

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Experimental Investigation of Combustion Instability in Syngas Turbulent Combustor

Baraiya

Chakravarthy

2021

Lecture Notes in Mechanical Engineering

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Excitation of high frequency thermoacoustic oscillations by syngas in a non-premixed bluff body combustor

Cited by 18 publications

References 53 publications

NOx emission reduction reaction of ammonia-hydrogen with self-sustained pulsating oscillations

NOx emission reduction reaction of ammonia-hydrogen with self-sustained pulsating oscillations

Effect of Fuel Composition on Thermoacoustic Instability in a Turbulent Combustor

Experimental Investigation of Combustion Instability in Syngas Turbulent Combustor

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