Abstract:

A combustion system with a vane swirler and non-premixed flow is investigated experimentally. The ratio between diameters of chamber and swirler is equal to unity （D/d= 1 ）. Nature gas is used as fuel. Pressure losses across the annular swirlers are measured for different swirler angles and velocities. The influence of changing gas swirler angle on velocity profile, temperature and wall static pressure distributions is studied and observation of the mixing is carried out.From experiments it is concluded that pressure losses of different swirler angles are correlated linearly by the parameter 2ghf2/ppρtg2θ The combustion performance is improved when the gas is injected tangentially into air from four holes on the wall Flame length is obviously shortened, average temperature rise is enhanced about from 50% to 80%.