Spray characteristics of liquid fuel air-assisted atomizers developed for a lean premixed-prevaporization combustor were evaluated under two kinds of conditions: in still air under non-evaporation conditions at atmospheric pressure and in a prevaporization-premixing tube under evaporation conditions with a running gas tube. The non-evaporated mass fraction of fuel spray was measured using a phase Doppler particle analyzer in the prevaporization-premixing tube, in which the inlet temperature ranged from 873 K to 1173 K. The evaporation of the fuel spray in the tube is mainly controlled by its atomization and distribution. The NOx emission characteristics measured with a combustor test rig were evaluated with three-dimensional numerical simulations. A low non-evaporated mass fraction of less than 10 % was effective in reducing the exhausted NOx from lean premixed-prevaporization combustion to about 1/6 times smaller than that from lean diffusion (spray) combustion. The flow patterns in the combustor are established by a swirl chamber in fuel-air preparation tube, and affect the flame stabilization of lean combustion.
Evaporation characteristics of spray in a lean premixed-prevaporization combustor for a 100 kW automotive ceramic gas turbine
Verdampfungseigenarten von Sprühnebel in einem manager vorgemischten und vorverdampften Vergasungsbrenner für eine keramische 100 kW Kraftfahrzeuggasturbine
1994
12 Seiten, 24 Bilder, 3 Tabellen, 22 Quellen
Aufsatz (Konferenz)
Englisch
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