Study of double vortex structure in the trapped vortex combustor

The trapped vortex combustor has developed to the fourth generation in less than 10 years for its excellent performance since K-Y Hsu presented the concept of it in 1995. Two experiments which were designed to the study of this conceptual combustor have been discussed in this paper. One of the experiments was performed to evaluate the emissions of the combustor. The outlet mixture's temperature distribution and emissions are measured by testo360 gas analyzer, the experiment results show that NO_x emissions can be reduced greatly by blowing from aft-cavity. The other experiment employs a PIV (particle image velocimetry) test which has been performed to study the cold flow field of the trapped vortex combustor, the results show that double vortex structure can be observed when the combustor is operating on the condition of low emissions. This testifies the contribution of double vortex structure to the combustor's low emissions performance further.