Numerical study on swirl premixed combustion chamber of a gas turbine was carried out. The influence of the cyclone channel width on flow field

temperature field and nitrogen oxide emission in the combustion chamber was mainly investigated. The reflow area is described from the perspective of streamline to explain the coupling relationship between the velocity field and the temperature field. The results show that

with an increase in the width of the cyclone channel

all the axial velocity

reflux velocity and recirculation zone area turns smaller in the flow field

so the reflow strength can be judged to be weakened. The relative position of the flame and the return zone has a great influence on the temperature distribution in the combustion chamber. When a large amount of heat release occurs after the return start position in the recirculation zone

heat accumulation occurs near the central axis of the top of the recirculation zone to form a large high temperature area. The formation of NOx requires both high temperature and high oxygen concentration conditions

and as the cyclone channel width becomes larger

the NO concentration at the burner outlet increases.