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Advances in Chemical Propulsion by Roy G.D. (ed.)

By Roy G.D. (ed.)

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One of the major experimental findings, among others, is liquid fuel pulsations proved most effective in a forced flame, and injecting fuel in phase with air vortices provided the highest temperatures. In both swirling and nonswirling flames, injecting fuel out of phase with air vortices proved to be the least efficient. Properly timed sequential fuel injection has been a pioneering innovation (Ephraim Gutmark, while at NAWC/WD) in soot reduction (Chapter 6) which has subsequently been applied successfully for instability control and NOx reduction.

Propulsion Power 16 (4):546-51. 2. , T. P. Parr, K. J. Wilson, K. H. Yu, R. A. Smith, D. M. Hanson-Parr, and K. C. Schadow. 1996. Compact waste incinerator based on vortex combustion. Combustion Science Technology 121:333–49. 3. Williams, F. A. 1989. Reduced kinetic schemes in combustion. In: Propulsion combustion: Fuels to emissions. Ed. G. D. Roy. New York: Taylor & Francis. 93–125. 4. , and G. D. Roy. 1995. Computational combustion approaches to a complex phenomenon. Naval Research Reviews XLVII(2):32–41.

Mixing is of paramount importance in any combustion process, and good mixing and efficient combustion will reduce UHC, CO, and soot. In order to achieve higher combustion efficiency, minimum pressure oscillations and emissions, control measures should be taken before, during, and after combustion and/or with a combination of active and passive techniques. Present day gas turbines are already pushed to the operational limits in terms of clean emissions and combustion efficiency. Catalytic converters, popular in automobiles, use metals as the catalytic surface that initiates reactions with greatly reduced activation energy for bond breaking.

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