Controlling Mechanisms of Pulsating Incineration Processes.
1997
Zinn, B. T. | Jagoda, J. I. | Matta, L. M.
The purpose of this research program is to study the fundamental processes that control the performance of acoustically excited incineration systems. The information learned will be used in the development of a compact, high-efficiency waste incinerator for shipboard use. Tests performed during the current reporting period of this program have demonstrated that mixing and heat transport processes, both crucial to the incineration process, may be enhanced by imposing acoustic pressure oscillations. Because the combustion efficiency and pollutant emission characteristics of incinerators are directly affected by the mixing of in-flowing air with fuel, acoustic control of turbulent jets is of interest to the development of compact incinerators. Studies of jets subjected to transverse mode oscillations have shown that, under the proper conditions, the jet will shed large, alternating, vortical structures that can cause the jet to bifurcate. This process results in a greater spatial mixing rate. Transverse mode acoustic forcing had the greatest effect in the range of St = 0.2 - 0.3. The effect of acoustic oscillations upon solid fuel pyrolysis was investigated by studying the effect of acoustic oscillations upon dry ice sublimation. This study showed that the presence of pulsations enhanced the sublimation process, which strongly suggests that they would also enhance the processes involved in incinerating solid wastes. Also, a model incinerator that can burn liquid and solid waste surrogates in the presence of transverse and multi- dimensional mode acoustic oscillations has been developed.
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