Journal of Dalian Maritime University >
2017 , Vol. 43 >Issue 1: 24 - 32
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2017.01.005
Study of air injection position on aft- bluff -body in an annular central bluff-body trapped vortex combustor
Received date: 2016-06-27
Revised date: 2016-09-17
Online published: 2016-09-18
The flow field of an annular central bluff-body trapped vortex combustor with different air injection position on aft-bluff-body was simulated by using the fluent software. Streamlines and pressure distribution on typical cross-section were analyzed in detail under different air injection position on aft-bluff-body. The vortex structure, averaged flow parameters of the trapped vortex cavity and the performance of the annular central bluff-body trapped vortex combustor under different air injection position on aft-bluff-body were comparatively analyzed. Results show that the relatively stable vortex structure can all be formed in the trapped vortex cavity under different air injection position, except the slightly different in size, shape and position of the vortex in the trapped vortex cavity. With air injection position moving outside, the average velocity in the trapped vortex cavity decreases, and the average static pressure and averaged turbulence intensity increases. The total pressure loss coefficient of the combustor is minimal when air injection position on aft-bluff-body is 1.5, followed is when the air injection position on aft-bluff-body is 0.75 with a value 0.0799.The air injection position on aft-bluff-body has little influence on changing trend of flow parameters along flow-path height direction at the exit of the annular central bluff body trapped vortex combustor.
GAO Cui-cui , HAN Ji-ang , ZHONG Jing-jun , LI Xiao-dong . Study of air injection position on aft- bluff -body in an annular central bluff-body trapped vortex combustor[J]. Journal of Dalian Maritime University, 2017 , 43(1) : 24 -32 . DOI: 10.16411/j.cnki.issn1006-7736.2017.01.005
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