Measurements and Modeling of Combustion Dynamics for Control of Combustion Instabilities
Final technical rept. 1 Jul 2003-30 Jun 2004
CALIFORNIA INST OF TECH PASADENA
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This report is the final report of a six-month program with a six-month NCE comprising experimental work on problems arising with unsteady combustion of gases intended for use in propulsion systems. The experimental work comprises measurements providing the basis for inferring the local response function of a reacting mixture and is based on great extended equipment purchased before this program began, with a DURIP grant from AFOSR. The basic part of the facility is apparatus for PLIF planar laser induced fluorescence measurements of a combustion system exposed to a sinusoidally varying pressure field, p, with q, the local fluctuation of heat release, appropriate measurements allow inference of qp proportional to the response function and qp, the integral over volume is proportional to the Rayleigh factor. In principal knowledge of these two quantities permits deduction of all important dynamical properties of a dynamical system. The greatest part of work during this year has been directed to determining the effect of fluctuations in fuel mixture ratio, most of the experimental work has been based on the use of acetone PLIF.
- Combustion and Ignition