Abstract
Numerical calculation was conducted to obtain the optimum structure parameters of the trapped vortex combustor (TVC) with the guide vane and blunt body. The results show that the optimum structure parameters of the guide vane are a/Hf=0.5, b/Li=0.2, and c/L=0.1, and the optimum structure parameters of blunt body are S/L=0.7, L2/L=0.1, and L1/Li=0.25. Then, the influence of different inlet conditions on the combustion turbulence flow was studied. The results show that high inlet temperature and low inlet velocity can effectively reduce total pressure loss; the equivalence ratio has little effect on total pressure loss. The study of unsteady flow shows that double vortices undergo the process of preliminarily forming-breaking down-forming again-being stable gradually.
Highlights
The trapped vortex combustor (TVC) [1, 2] was proposed to meet the performance requirements of high temperature rise and low pollution for the modern gas turbine and aircraft engine
The results show that lean blowout (LBO) and combustion efficiency depend upon the strut length to a great extent
When the mainstream passes over the blunt body, the accelerated mainstream squeezes the secondary vortex behind the guide vane, and the secondary vortex core moves to the inside of the cavity
Summary
The trapped vortex combustor (TVC) [1, 2] was proposed to meet the performance requirements of high temperature rise and low pollution for the modern gas turbine and aircraft engine. Combined with the above analysis of total pressure loss and the change of vortex, the smaller L2 and the larger S, the smaller total pressure loss is and the better the double vortices in the cavity and the backflow region behind the blunt body.
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