Acoustic signature from flames as a combustion diagnostic tool

Conference · Fri Jan 01 00:00:00 EST 1982 · AIAA Pap.; (United States)

OSTI ID:5593213

Ramachandra, M K; Strahle, W C

A nonintrusive acoustic technique has been developed to obtain the fluctuating heat release rate distribution in open premixed turbulent flames. Propane-air flames of equivalence ratio 0.6, 0.8, and 1.0 with a burner of diameter 16.4 mm and a mean flow speed of 11.55 m/sec have been employed. Sound pressures in the near field of flames were measured in an anechoic chamber. With the acoustic spectra as the input, heat release rate spectral information was obtained by numerically solving a Fredholm integral equation of the first kind using an augmented Galerkin method. Computed results have been qualitatively verified by C2 emission studies. Experimentally observed correspondence between mean and rms C2 emission intensity implies that the shape of the mean heat release rate distribution can, in principle, be deduced by the acoustic technique.

• Research Organization: Georgia Inst. of Technology, Atlanta
• OSTI ID: 5593213
• Report Number(s): CONF-820106-
• Journal Information: AIAA Pap.; (United States), Vol. 82-0039; Conference: 20. aerospace science conference, Orlando, FL, USA, 11 Jan 1982
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COMBUSTION
ACOUSTIC TESTING
HEAT TRANSFER
COMBUSTION CHAMBERS
COMBUSTION HEAT
FLAME PROPAGATION
FLAMES
FREDHOLM EQUATION
PRESSURE MEASUREMENT
PROPANE
STABILITY
TEMPERATURE DISTRIBUTION
TURBULENCE
VELOCITY
VISIBLE RADIATION
WAVE PROPAGATION
ALKANES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY TRANSFER
ENTHALPY
EQUATIONS
HEAT
HYDROCARBONS
INTEGRAL EQUATIONS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
ORGANIC COMPOUNDS
OXIDATION
PHYSICAL PROPERTIES
RADIATIONS
REACTION HEAT
TESTING
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry