Coherent Anti-Stokes Raman Spectroscopy (cars) Gas Temperature Measurements in a Monodisperse Combusting Droplet Stream.

Details Coherent Anti-Stokes Raman Spectroscopy (cars) Gas Temperature Measurements in a Monodisperse Combusting Droplet Stream. Coherent Anti-Stokes Raman Spectroscopy (cars) Gas Temperature Measurements in a Monodisperse Combusting Droplet Stream.

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........20z&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, IRVINE, 1991.Source: Dissertation Abstracts International, Volume: 52-12, Section: B,

Computer Science

Scientific paper

This dissertation describes a coherent anti-Stokes Raman spectroscopy (CARS) instrument for spatially and temporally resolved non-intrusive temperature measurements in combustion environments. It presents a detailed description of the CARS system development and standard procedures to perform CARS gas temperature measurements,and procedures to analyze the CARS spectra for temperature determination. The dissertation also applies the CARS apparatus developed to a single monodisperse methanol droplet stream flame to demonstrate synchronous CARS temperature measurements. The measurements correlate the temperature field with the droplet position and give the local characteristics of the combusting droplet stream thermal field. These measurements are not possible with conventional thermal probes due to the perturbation caused by the probes and the poor temporal and spatial resolution. These CARS measurements are the first known non-intrusive characterization of the local temperature field near burning droplets. The experiments use a 50 μm diameter nozzle vibrated by a piezoelectric crystal to generate a monodisperse droplet stream with a droplet diameter of about 150 μm and droplet-to-droplet spacing of 10 droplet diameters. A frequency divider divides the crystal vibration frequency of 10 kHz 1000 times to synchronize the CARS laser firing (~ 10 Hz) with the droplet generation process. The results show that there is a small thermal wake behind each droplet in the stream. The temperature profile measured radially outward from the droplet has a local minimum near the droplet surface, rises to a maximum at about 7 droplet diameters away, and then falls to room temperature at a radial distance of 15 mm (100 droplet diameters). The temperature profile measured between two adjacent droplets on the stream axis is nearly flat, suggesting that individual flames do not surround each droplet. The local effects due to the presence of droplets completely disappear about 15 droplet diameters away from the droplet stream centerline. Temperature contours constructed from the measurements of several radial profiles around two adjacent droplets shows a cylindrical flame structure. The results from the experiments also provide data for detailed droplet array and droplet stream combustion models.

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