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  Acoustic Imaging for Local Diagnostics of Chemically Reacting Systems
 
 
Titel: Acoustic Imaging for Local Diagnostics of Chemically Reacting Systems
Auteur: Ramohalli, Kumar
Seshan, Panchalam
Verschenen in: Combustion science and technology
Paginering: Jaargang 37 (1984) nr. 5-6 pagina's 253-261
Jaar: 1984-06-01
Inhoud: The concept of local, non-intrusive diagnostics in chemically reacting systems with acoustic imaging is developed. The desirability of diagnosing local, instantaneous zones in reacting flows is mentioned. A brief description is given of the state of the art in acoustics and acoustic diagnostics of chemically reacting systems. The elements of acoustic imaging through ellipsoidal mirrors are theoretically discussed. The system is chosen in these studies to be a simple, open—jet, non—premixed, turbulent flame. Methane is the fuel and enriched air is the oxidizer. A chemically reacting flow system is established at a Reynolds number (based on cold viscosity) of 50,000. A 1.5—m—diameter acoustic mirror with an f—number of 0.74 is used to map the acoustic source zone along the axis of the flame. The results are presented as the acoustic power spectra at various distances from the nozzle exit. It is seen that most of the reaction intensity is localized in a zone 4 to 8 diameters from the exit. The bulk reactions (possibly around the periphery of the larger eddies) are evenly distributed along the length of the flame. Possibilities are seen for locally diagnosing single zones in a multiple cluster of reaction zones that occur frequently in practice.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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