Body Force Model for the Aerodynamics of Inclined Perforated Surfaces

Xiong, Juntao; Johnson, Andrew; Liu, Feng; Papamoschou, Dimitri

doi:10.2514/1.j051699

Cited by 14 publications

(3 citation statements)

References 21 publications

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“…The computational fluid dynamics code used here is known as PARCAE 10 and solves the unsteady three-dimensional Navier-Stokes equations on structured multiblock grids using a cell-centered finitevolume method. Information exchange for flow computation on multiblock grids using multiple CPUs is implemented through the MPI (Message Passing Interface) protocol.…”

Section: A Numerical Codementioning

confidence: 99%

Large Eddy Simulation of Three-Stream Jets

Xiong

Liu

Papamoschou

2018

2018 AIAA Aerospace Sciences Meeting

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We present a computational study of three-stream jets simulating the exit conditions of future commercial supersonic aircraft engines. The study is conducted for coaxial and asymmetric configurations at realistic cycle condition. The asymmetric arrangement involved offsetting the tertiary duct and applying an internal wedge-shape deflector. Computations using Large Eddy Simulation (LES) provide detailed time-resolved information on the flow field. The resulting statistics are compared with the output of a Reynolds-Averaged Navier-Stokes (RANS) solver, a low-cost method that can be used as a design tool. The statistics are in overall agreement, with RANS predicting a slightly longer potential core than LES. The asymmetry produces significantly thickened tertiary flow and turbulent kinetic energy reduction on the underside of the jet plume with attendant specific thrust loss of only 0.039%. The far field noise is calculated by applying the Ffcows Williams-Hawkings (FWH) equation to the LES results. The results show similar trends of far field noise spectra as measured by experiments.

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Section: A Numerical Codementioning

confidence: 99%

Large Eddy Simulation of Three-Stream Jets

Xiong

Liu

Papamoschou

2018

2018 AIAA Aerospace Sciences Meeting

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“…The computational fluid dynamics code used here is known as PARCAE 27 and solves the unsteady threedimensional Navier-Stokes equations on structured multiblock grids using a cell-centered finite-volume method. Information exchange for flow computation on multiblock grids using multiple CPUs is implemented through the MPI (Message Passing Interface) protocol.…”

Section: Computational Approachmentioning

confidence: 99%

Quiet Nozzle Concepts for Three-Stream Jets

Papamoschou

Phong

Xiong

et al. 2016

54th AIAA Aerospace Sciences Meeting

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We present a study of three-stream nozzle concepts with potential to reduce takeoff noise of future commercial supersonic aircraft. The concepts were evaluated at realistic cycle conditions in a subscale acoustic facility. Computations solving the Reynolds-Averaged Navier-Stokes equations provided insight into the changes in the flow field that can impact noise generation. The investigation encompassed long-and short-cowl nozzles in coaxial and asymmetric arrangements where the third stream was concentrated in the downward azimuthal direction. In coaxial configurations, addition of the third stream makes a modest impact on the noise emission, with a small benefit at high frequencies in the aft arc. This benefit is more evident in short-cowl nozzles. Asymmetric arrangements involved offsetting the tertiary duct and/or application of an internal wedge-shaped deflector. The asymmetry produces significant noise reduction in the direction of the thickened tertiary flow, and is more effective at cycle conditions with high specific thrust. Reduction of the skewness of the far-field pressure fluctuations suggests suppression of Mach wave radiation by the asymmetric tertiary flow.

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“…Similarly, Gerova et al (2013) investigated a heat exchanger application involving inclined screens and honeycombs. In aerodynamic applications, permeable flaps and deflectors have been evaluated as means for jet noise reduction (Xiong et al , 2012) and control of drag (Lee, 2009). The use of aircraft drag brakes is phenomenologically related to a perforated plate impinged at an angle of attack (Lee, 2009; Florendo et al , 2006).…”

Section: Introductionmentioning

confidence: 99%

Flow impingement on a perforated plate at an angle of attack

Bayazit

Sparrow

Gorman

2017

HFF

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Purpose The purpose of this paper is to provide both directly applicable fluid-flow results and fluid-mechanic fundamentals for flow impinging at an angle of attack on a perforated plate. Design/methodology/approach A physical situation was modeled with high fidelity, and the model was implemented by numerical simulation. The simulations spanned all possible flow regimes including laminar, intermittent (transitional) and turbulent, and the Reynolds numbers that defined each flow regime were definitively determined. The Reynolds numbers ranged from 0.1 to 30,000, the angles of attack included 0, 5, 15 and 22.5° and the host duct dimensions varied appropriately. Findings It was found that the perforated-plate pressure drop decreased moderately with an increasing angle of attack, an outcome directly relevant to design. The pattern of fluid flow caused by the presence of the plate was dominated by a large recirculation zone situated downstream of the plate in a corner between the plate and an adjacent wall. The recirculation zone played the role of a blockage which deflected the flow emerging from the apertures in the plate toward the opposite wall. Originality/value (a) Pressure drop information directly applicable to design, (b) downstream distance from the plate at which the plate-created flow disturbance disappears, (c) account taken of the intermittent flow regime between laminar and turbulent, (d) implementation of a new metric to characterize the strength of turbulence.

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Body Force Model for the Aerodynamics of Inclined Perforated Surfaces

Cited by 14 publications

References 21 publications

Large Eddy Simulation of Three-Stream Jets

Large Eddy Simulation of Three-Stream Jets

Quiet Nozzle Concepts for Three-Stream Jets

Flow impingement on a perforated plate at an angle of attack

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