Modeling turbulent/chemistry interactions using assumed pdf methodsTwo assumed probability density functions (pdfs) are employed for computing the effect of temperature fluctuations on chemical reaction. The pdfs assumed for this purpose are the Gaussian and the beta densities of the first kind. The pdfs are first used in a parametric study to determine the influence of temperature fluctuations on the mean reaction-rate coefficients. Results indicate that temperature fluctuations significantly affect the magnitude of the mean reaction-rate coefficients of some reactions depending on the mean temperature and the intensity of the fluctuations. The pdfs are then tested on a high-speed turbulent reacting mixing layer. Results clearly show a decrease in the ignition delay time due to increases in the magnitude of most of the mean reaction rate coefficients.
Document ID
19920071477
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gaffney, R. L, Jr. (NASA Langley Research Center Hampton, VA, United States)
White, J. A. (NASA Langley Research Center Hampton, VA, United States)
Girimaji, S. S. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Drummond, J. P. (NASA Langley Research Center Hampton, VA, United States)