Techniques have been developed for measuring the
temperature, stable species concentrations, and atomic
radical concentrations during a transient combustion
event. They combine the features of direct sampling with
two spectroscopic techniques to produce relatively simple
diagnostic techniques to obtain time-resolved
measurements. In this study, a transient event was
provided by a propagating hydrogen/air flame. Stable
species were detected downstream of the sampling orifice
by electron impact fluorimetry, while temperatures and
atomic hydrogen concentrations were measured by atomic
resonance absorption spectroscopy. The calculation of
stable species concentrations from time-varying
fluorescence signals was straightforward, however
conversion from absorption measurements to temperatures
and atomic radical concentrations required the development
of a computer model of the radiation source and the
absorption by the sample. The model of the source was
validated by comparing predicted and recorded spectra of
hydrogen Lyman-α emissions, while the absorption model for
the sampled gas was tested by comparing the temperatures
predicted by absorption measurements with those recorded
at a range of known temperatures. These direct sampling
spectroscopic techniques minimize time-history distortions
inherent in other direct sampling techniques, and are
capable of tracking local temperatures and species
concentrations during the passage of a propagating flame
front. / Graduation date: 1990
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/38264 |
| Date | 14 December 1989 |
| Creators | Herron, John R. |
| Contributors | Peterson, Richard B. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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