Locked vortex afterbodies

Little, Bryan; Whipkey, R. R.

doi:10.2514/6.1978-1179

Cited by 1 publication

(2 citation statements)

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“…The pilot flame is very well shielded from the main flow and hence is stable to high values of main flow velocities [2]. Little and Whipkey [3] arrived at an optimal aspect ratio of the cavity to trap a stable vortex and hence reduce drag on the afterbody. Hsu et al [1] developed an axisymmetric TVC to validate the results of Little and Whipkey [3] for the cavity aspect ratio, with separate fuel and air injection through multiple injection holes in the afterbody.…”

Section: Introductionmentioning

confidence: 99%

“…Little and Whipkey [3] arrived at an optimal aspect ratio of the cavity to trap a stable vortex and hence reduce drag on the afterbody. Hsu et al [1] developed an axisymmetric TVC to validate the results of Little and Whipkey [3] for the cavity aspect ratio, with separate fuel and air injection through multiple injection holes in the afterbody. They observed very low overall lean-blow-out equivalence ratio for a wide range of annular air velocity.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of fuel—air mixing in a two-dimensional trapped vortex combustor

Mishra

Sudharshan

2009

Proceedings of the Institution of Mechanical Engineers, Part G:

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The concept of trapped vortex combustion is emerging as a viable method of burning fuel effectively in aero-gas turbine engines. In a two-dimensional trapped vortex combustor (TVC), fuel-air mixing is characterized by using the parameter intensity of segregation (I s ). When fuel and oxidizer are present (with some macro-mixing already having taken place), the parameter quantifies the extent of local micro-mixing within the domain. The regions of maximum fuel-oxidizer mixedness are identified to be the vortex edge and dump shear layer of the cavity. These two regions are observed to be zones of very good fuel-air mixing with higher levels of turbulence. Increasing aspect ratio (L/D) and the mainstream velocity (V ms ) increases mainstream air entrainment into cavity, resulting in improved fuel-air distribution and mixing. However, an optimal L/D = 1.2 and V ms = 40 m/s results in stable vortex being trapped with better fuel distribution throughout the cavity.While non-optimal L/D and V ms may result in improved mainstream air entrainment, it is found to disrupt the trapped vortex, which is not conducive for combustion. Hence, for a given L/D, there is an optimal momentum ratio between the cavity injections and mainstream flow, which results in a single large vortex being trapped that can roll up the fuel-air injected and distribute them across the cavity, required for stable combustion in a TVC.

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