THREE-DIMENSIONAL SWIRLER

摘要

Pre-mixture forming swirler in gas turbine pre-mixed flame type low NO x combustor is improved so as to accelerate mixing of fuel and air and to prevent occurrence of flame stagnation and burning of component. Three-dimensional swirler is constructed such that swirler vane (101a) is twisted from hub side thereof to tip side so that fitting angle (.beta.) of the tip side relative to fuel nozzle (102) center axis (C) is larger than that (.alpha.) of the hub side. Thereby, while the angle (.alpha.) of the hub side is set smaller so that flame stagnation and burning of components resulted therefrom may be prevented from occurring, the angle (.beta.) of the tip side may be selected so that shearing flow necessary for appropriate mixing of fuel (F) and air (A) is obtained, thus favorable pre-mixing is done, life deterioration due to the burning etc. is prevented and combustion efficiency is enhanced.