Investigation of Real-Time Two-Dimensional Visualization of Fuel Spray Liquid/Vapor Distribution via Exciplex Fluorescence

摘要

This final report describes the achievements of the research program carried out under the subject contract. The overall aim of the study was to develop a new and unique combustion diagnostic technique which would provide the real-time, two-dimensional visualization of both the liquid and vapor phase of a fuel spray by means of laser-induced exciplex fluorescence. Significant achievements toward this end were: (1) Demonstration and application of an exciplex thermometer, (2) Discovery of new exciplex systems, particularly intramolecular exciplex systems, (3) Formulation of a total scheme involving analysis of the exciplex spectral emissions for determining temperature, liquid and vapor concentrations, and the local oxygen pressure in the spray field, (4) Construction of an apparatus for studying single injected droplets into a controlled environment of temperature and pressure for observation of laser-induced exciplex fluorescence, (5) Modeling of single droplet vaporization in support of the experimental studies, (6) Observation of single droplet liquid and vapor phase fluorescence in two-dimensions, and (7) Experiments toward achieving quantitative exciplex fluorescence measurements.