This report describes the research progress accomplished during the eighth quarter of the contract, which has been extended to ten quarters. The parametric studies were continued during this quarter to obtain steady state solutions for gasifiers without devolatilization, for gasifiers with inlet reservoir devolatilization, and for longer gasifiers than previously investigated. These steady state solutions were then used as a reference base for studying the effects of large amplitude pulsations on gasifier performance. The effect of inlet particle temperature, inlet oxygen mass fraction, and gasifier length on the growth or decay of the acoustic oscillations was determined. In all cases considered so far the amplitude of the oscillations decayed with time. Finally, the report presents the progress achieved in the experimental phase of the project. 1 ref., 14 figs., 2 tabs.