Combustion Dynamic Processes Associated with Chemical Advanced Lasing Systems.

摘要

A four-year program has been devoted to some problems of combustion dynamics arising in chemical lasers. The subjects treated are common to any system to be use as the basis for a laser, but the CS2/O2 system has been adopted as the particular example. This work has been generally concerned with the combined influences of molecular kinetics, chemical kinetics and fluid mechanics. Both experimental and analytical efforts have been directed to pre-mixed flames and the reacting laminar mixing layer, all at low speeds (< 10 m/sec) and low pressures (< 20 torr). Data for the flame speeds of pre-mixed flames have been used to verify the simplified kinetics mechanism deduced early in this program. Observations of spontaneous emission have been used to deduce flow temperatures; and the populations and rates of populations for the vibrational levels of carbon monoxide produced in the reactions O + CS yields CO + S. Those results, taken over broad ranges of mixtures and flow conditions, and combined with analytical work, have shown why, for this system, combustion in the laminar mixing layer is greatly inferior to pre-mixed flames for producing stimulated emission. (Author)