Flow coupling effects in jet-in-crossflow flowfields

Bain, D. B.; Smith, Clifford E.; Liscinsky, D. S.; Holdeman, J. D.

doi:10.2514/6.1996-2762

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Improving upon previous LES studies, the main aim of the present work is to illustrate and compare the predictive capabilities of LES in both uncoupled and coupled simulations of the chosen geometry. Whilst such comparisons have been previously made in the context of RANS [3,18], LES appears not to have been used for this purpose.…”

Section: Introductionmentioning

confidence: 98%

“…The effects of simulating the core/annulus coupling mechanism have been previously studied by Manners [15], Baker [4], Crocker et al [6], Bain et al [3] and McGuirk and Spencer [18] using a k-ε model. These studies show the k-ε model to considerably under predict turbulence levels within the combustor core and provide a poor representation of the upstream RFZ characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of Impinging Jets in a Confined Flow

Clayton

Jones

2006

Flow Turbulence Combust

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Large eddy simulation (LES) has been applied to a representative primary combustion zone in an isothermal constant density simulation. The primary combustion zone of a gas turbine combustor is known to be one of the most challenging combustor regions to study numerically. The main flow features are typically governed by the impingement characteristic of the multiple air admission jets that stem from the coupled feed annulus, resulting in high levels of turbulence, recirculation and unsteady/periodic flow conditions. The chosen cylindrical geometry consists of an annular passage that feeds a row of six port-holes. The resulting radial jets impinge strongly within a confined core cross-flow. Both uncoupled (core only) and coupled (core and annulus) simulations are considered. In the uncoupled simulation detailed experimental data is used to provide port boundary conditions, whilst the coupled simulation models the flow within the annulus and port openings. The findings conclude that the coupled LES can adequately reproduce the port characteristics resulting in a good description of the core combustor flow field, potentially superior to that given by the uncoupled case and far superior to that given by RANS.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Impinging Jets in a Confined Flow

Clayton

Jones

2006

Flow Turbulence Combust

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“…Reports and papers from NASA-supported studies in a c y lindrical duct that were published since the previous article was presented are summarized b y Holdeman et al (1996). Recent results from rectan gular and annular confi gurations include, Bain et al (1992Bain et al ( -1995b, Bain et al (1996), Blome yer et al (1996), Chiu, Roth, Mar gason & Tso (1993), Chiu, Roth, Karlin, Margason & Tso (1993), Crocker & Smith (1992, , Doerr & Henneke (1993), Doerr et al (1995a & I 995b), Everson et al (1995), Liscinsk y et al (1992), Liscinsky, Vranos, & Lohmann (1993), Liscinsk y, True, & Holdeman (1993). Liscinsky et al (1994Liscinsky et al ( -1996b.…”

Section: Introductionmentioning

confidence: 99%

Mixing of Multiple Jets With a Confined Subsonic Crossflow: Part II — Opposed Rows of Orifices in Rectangular Ducts

Holdeman

Liscinsky²,

Bain

1997

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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This paper summarizes experimental and computational results on the mixing of opposed rows of jets with a confined subsonic crossflow in rectangular ducts. The studies from which these results were excerpted investigated flow and geometric variations typical of the complex 3-D flowfield in the combustion chambers in gas turbine engines. The principal observation was that the momentum-flux ratio, J, and the orifice spacing, S/H, were the most significant flow and geometric variables. Jet penetration was critical, and penetration decreased as either momentum-flux ratio or orifice spacing decreased. It also appeared that jet penetration remained similar with variations in orifice size, shape, spacing, and momentum-flux ratio when the orifice spacing was inversely proportional to the square-root of the momentum-flux ratio. It was also seen that planar averages must be considered in context with the distributions. Note also that the mass-flow ratios and the orifices investigated were often very large (jet-to-mainstream mass-flow ratio >1 and the ratio of orifices-area-to-mainstream-cross-sectional-area up to 0.5 respectively), and the axial planes of interest were often just downstream of the orifice trailing edge. Three-dimensional flow was a key part of efficient mixing and was observed for all configurations.

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Combustion in a Cross Flow with Air Jet Nozzles

Kamal

2008

Combustion Science and Technology

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Flow coupling effects in jet-in-crossflow flowfields

Cited by 5 publications

References 7 publications

Large Eddy Simulation of Impinging Jets in a Confined Flow

Large Eddy Simulation of Impinging Jets in a Confined Flow

Mixing of Multiple Jets With a Confined Subsonic Crossflow: Part II — Opposed Rows of Orifices in Rectangular Ducts

Combustion in a Cross Flow with Air Jet Nozzles

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