Theory of Combustion Noise

Chiu, H. H.; Summerfield, M.

doi:10.21236/ada001108

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…The 2o32 Briiel and Kjaer analyzer computes the spectra for a frequency range of o to 80o Hz with a spectral resolution of 1 Hz. Theoretically, Strahle [23] and Chiu and Summerfield [9] demonstrate that the acoustic emission is related to the variation of the local density produced by nonsteady heat release. 12.…”

Section: Comparison With Acoustic Measurementsmentioning

confidence: 99%

Thin filament infrared pyrometry: instantaneous temperature profile measurements in a weakly turbulent hydrocarbon premixed flame

Pauzin

Giovannini

Bédat

1994

Experiments in Fluids

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Section: Comparison With Acoustic Measurementsmentioning

confidence: 99%

Thin filament infrared pyrometry: instantaneous temperature profile measurements in a weakly turbulent hydrocarbon premixed flame

Pauzin

Giovannini

Bédat

1994

Experiments in Fluids

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“…The general theoretical problem of noise production from combustion has been considered by Bragg (1963), Kotake and Hatta (1968), Strahle (1971), and Chiu and Summerfield (1974). The real problem is to obtain a valid expression for the reaction rate term usually denoted by oo,.…”

Section: Some Theoretical Considerationsmentioning

confidence: 99%

Some Fundamental Acoustic Observations in Combusting Turbulent Jets

Ramohalli

1981

Combustion in Reactive Systems

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An experimental study has been made of the acoustic emissions from turbulent combustion zones with the specific intention of inferring the combustion details from the acoustic field. Included are data from a laboratory burner, a commercial burner tested in the laboratory, and a seven-head system of burners installed commercially on a rotary kiln. The fuels used include methane, ethane, propane, and natural gas. Based on an order-of-magnitude analysis of the turbulent combustion zone, specific frequency bands of the acoustic emissions are examined. It is found that any change in the combustion zone (air/fuel ratio) is invariably reflected in the acoustic amplitudes in three bands. Product gas analyses show that the nonefficient combustion correlates with these perceptible changes in the acoustic signatures. The theoretical reasoning and the experimental results show the feasibility of acoustically monitoring the combustion zones to infer such details as efficiency and pollutant production. The acoustic spectrum of a combustion zone reveals many details which can be deduced to be geometry dependent, flow dependent, turbulence dependent, or combustion dependent. The close interplay of these influences makes it difficult, in general, to isolate the individual effects. The simplified analysis here attempts to deduce the geometry and turbulence effects. It is consistent with the observed behavior for both premixed and nonpremixed flames. Also, this simplified analysis identifies the high-frequency zone as a possible region of acoustic emission directly influenced by combustion.Nomenclature a = sonic velocity in the ambient atmosphere, m/s 3* = distance from burner exit to microphone, m D = burner exit diameter, m

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“…3 indicates the Saudi Arabian Flight crash in which entire crew and passengers lost their life because of engine failure which causes burn of whole aircraft. Following the work of Chiu and Summerfield [1], Schadow and Gutmark [2] an abstract understanding of thermo-acoustics is set. The first study on a flame under acoustic excitation was performed by Lovett and Turns [3], who investigated acoustic excitation in a turbulent jet flame for an excitation frequency ranging from 2 to 1300 Hz and an oscillating velocity amplitude of 0.13-0.89 relatives to the bulk velocity issuing from the burner.…”

Section: Introductionmentioning

confidence: 99%

Effect of acoustic energy on onset of fire propagation phenomenon

Shekhar

Thombare

Malhotra

2021

Journal of Energy Systems

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Scholars and scientists have been making efforts to discover ways to control and lessen the resonance of concurrent fires such as forest fires, and various space fires; however, no potential solutions have been concluded from their studies so far. The origin of these types of fires concerns the unstable nature of the flames and the considerable unpredictability associated with them. This work led us to do proper experimentation for the effect of sound on the spreading of the flames. Sound energy as a wave is always accompanied by compression and rarefaction. As an external effect, sound in the immediate vicinity of spreading flame can affect the flame spread rates. Appreciable work had been carried out however; the effect of sound on flames in a purely natural convective environment is an aspect yet to be thoroughly understood. Flame spread rate is a direct indication of forwarding heat transfer from burning to non-burning region. Formation of localized pressure and velocity fields occurs around the pilot fuel by the presence of sound waves. Change in heat transfer may results in increment or decrement in spread rates, when compared with one without sound. The present work attempts physical insight into the effect of sound frequency of intermediate range (3500 Hz to 7500Hz) on the spreading of flames in different configurations coupled with external sources. Results advocate the noteworthy impact of acoustics on the fire propagation phenomenon in distinct modes. Experimentation have revealed that acoustics has a critical influence on fire propagation, reducing the spread rate by 100 percent in a unilateral configuration.

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Theory of Combustion Noise

Cited by 12 publications

References 7 publications

Thin filament infrared pyrometry: instantaneous temperature profile measurements in a weakly turbulent hydrocarbon premixed flame

Thin filament infrared pyrometry: instantaneous temperature profile measurements in a weakly turbulent hydrocarbon premixed flame

Some Fundamental Acoustic Observations in Combusting Turbulent Jets

Effect of acoustic energy on onset of fire propagation phenomenon

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