| 摘要 |
FIELD: heat engineering; ignition and maintenance of combustion in combustion chambers of various power systems of gas- turbine plants, gas-turbine engines, furnaces, boilers, etc. SUBSTANCE: method consists in forming two zones of fuel-and-air mixture at shortage and excess of air by supplying fuel and air, twisting flow of fuel- and-air mixture in first zone; air and fuel are fed to first zone; part of fuel is fed before swirler; then, fuel-and-air mixture is transferred to second zone by enclosing it in limited space of gas duct; twisting the flow of fuel-and-air mixture in first zone is effected at intensity S found from the following formula: S = (ω2.Dfl)/2g>=104, where ω - is angular velocity of flow twisting; Dfl - is diameter of flow of fuel-and-air mixture; g is free fall acceleration; excess air coefficient alpha in first zone is selected within the following range: alpha = Gair/(Gm.L0) = 0,6/1,5, where Gair - is flow rate of air through fuel burning unit; Gm - is total flow rate of fuel through fuel burning unit; L0 - is stoichiometric coefficient. Relationship of fraction of fuel fed before swirler G1 to total flow rate of fuel Gm is G1/Gm = 1-0. EFFECT: low thermal factor due to effective twisting of fuel-and-air mixture, transporting it through considerable distance from fuel burning unit inlet and forming cone at outlet of this unit. 5 cl, 4 dwg |
