Effects of location and angle of primary injection on the cavity flow structure of a trapped vortex combustor model

Abstract

In these years, many works have been done on the combustion performance and flow structure of a trapped vortex combustor (TVC). However, to the best of our knowledge, little works have been done so far to unravel the effect of combination of various factors on cavity flow structure. In this study, a TVC has been studied to understand the effects of the angle and location of primary injection on the cavity flow structure with both experimental and numerical methods. The results indicate that the computational results match well with the experimental results. Two different flow structures have been found out with different combinations of θ and H, which are termed as “broken” and “closed”. Besides, when the distance between the primary injection and the bottom wall of the cavity (H) increases and the inlet angle of the primary injection (θ) is kept constant, the flow structure will be “broken”. If θ increases at this moment, the flow structure changes from “broken” to “closed”. The results are helpful for providing a good deal of insight into the flow structure and flow field organization of TVC.