Experimental investigation on cold flow field characteristics of low emission trapped-vortex combustor

Particle image velocimetry (PIV) was used to perform experimental investigation on cold flow field characteristics of low emission trapped-vortex combustor(TVC) model.The varieties of the cold flow field characteristics and the total pressure loss coefficient were obtained.The results show that vortex structures are stable in the model of low emission TVC,and the double vortex structure exists in the trapped vortex area located in the rear of the mainstream,as well as the single vortex structure exists in the trapped vortex area located in the rear of flame transport board.The double vortex system transforms into the single vortex system and the vortex center positions show a little change in these different sections.The center positions of double vortex and single vortex in each section do not change with the inlet Mach number (0.15~0.30) increasing,but the primary vortex area in double vortex system increases,and the secondary vortex area also changes,which is the largest at Mach number of 0.2.The velocities of airflow in the primary combustion zone and the edge of the vortex,the vortexes strength,and the total pressure loss coefficient increase with the inlet Mach number changing from 0.15 to 0.3.