: This book has several purposes, including a broad historical summary of combustion instabilities in propulsion systems; a concise compilation of the main mechanisms for instabilities in liquid and solid fueled rockets, ramjets, thrust augmentors and gas turbines; development of a theoretical framework for investigating unsteady motions in combustion systems; and accessible surveys of the basic material required to understand the subject. Emphasis is placed throughout the book on observed behavior. For well-understood reasons, the best, and in many respects most useful quantitative data, have been obtained for solid propellant rockets. Hence that type of device occupies a special position in the subject. The book comprises nine chapters and eight annexes. Material in the annexes is not essential for reading and broadly understanding the main part of the book, but is likely interesting for those choosing to do research on the subject. The nine chapters divide into three parts.

Unsteady Motions in Combustion Chambers for Propulsion Systems

A review of rijke tubes, rijke burners and related devices

Flashback propensity of syngas fuels

Gas turbines are clean, compact and eAEcient engines for electric power generation. They are used at a large scale to this end and are usually red with natural gas. A novel development is to re them with coal gas produced by a coal gasier. This opens ways to use the huge coal resources in a clean and eAEcient operation. As the combustion properties and conditions of coal gas are very dierent from those of natural gas, it is necessary to redesign the burners
and combustors of the gas turbine. Because of the complexity of the burners and combustors in a gas turbine, many diAEculties have to be taken care of.

/pdf/on-the-acoustics-of-turbulent-non-premixed-flames-4m1y11w1ni.pdf

On the acoustics of turbulent non-premixed flames

The paper presents experimental measurements of flashback propensity of H2 -CO mixtures (primary constituents of syngas fuels). Effects of H2 concentration, external excitation and swirl on the flashback propensity of H2 -CO flames are discussed. The flashback behavior of H2 -CO flames changes nonlinearly with the increase in H2 contents in the mixture. The critical velocity gradient (gF ) values of 5%–95% and 15%–85% H2 -CO mixtures somewhat agree with the scaling relation (gF = c(SL 2 /α)) and yield an average c value of 0.035. However, the gF values of 25%–75% H2 -CO mixture show higher order variations with the SL 2 /α ratio (especially for SL 2 /α < 19,000 s−1 ). At a lower SL 2 /α ratio, burner diameters have small effects on critical velocity gradient measurements; however, the effect is significant at higher SL 2 /α ratio. The effect of external excitation on the flashback propensity of H2 -CO flames with more than 5% H2 is not significant. Flashback through two mechanisms and their dependence on combustor parameters were also identified for swirl stabilized H2 -CO flames.Copyright © 2009 by ASME

Flashback Propensity of Syngas Fuels

Self-excited oscillations in combustion chambers with premixed flames and several frequencies

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Self-excited oscillations in combustion chambers with premixed flames and several frequencies