Benchmark Spray Combustion Database

J. F. Widmann, S. R. Charagundla, and C. Presser
High Temperature Processes Group
Process Measurements Division
Chemical Science and Technology Laboratory

The objective of this research is to develop a database of benchmark experimental data to be used for input and validation of spray combustion models. A variety of diagnostic techniques are being employed to characterize the multiphase combustion. Of particular interest are measurements of the spray characteristics and flame emissions. A phase Doppler technique is used to determine number density, size, and velocity of the fuel droplets within the flame, and the gas phase is chemically characterized using Fourier transform infrared spectroscopy.

In stage 1 of this project, methanol is used as the fuel because the chemistry is well understood and combustion does not result in the formation of solid particulates. The complications associated with a highly sooting flame will be addressed in stage 2 of this project. This work is part of a larger effort to develop measurement technology that will provide experimental data for input/validation of multiphase combustion models, process optimization and control, calibration of instrument/sensors, and the development of advanced diagnostic techniques suitable for use within spray flames. It is also desirable to establish correlations between operating conditions, and the resultant spray flame characteristics, thermal gradients, and level of chemical byproducts. Such correlations will help improve our fundamental understanding of combustion processes, and assist in validating spray combustion models.