Characterization and Control of Nacelle Inlet Flow in Crosswind

Nichols, Derek A.; Vukašinović, Bojan; Glezer, Ari; DeFore, Matthew C.; Rafferty, Bradley; Palacios, Francisco

doi:10.2514/6.2019-3685

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Steady computational analysis of an intake in crosswind with no ground and no fan [12] showed that a quasi-3D representation of the intake ŕow may be good enough to capture the separation onset but it was not adequate at post-separation conditions due to the notable changes in the capture streamtube. Nichols et al [13,14] experimentally assessed within a low-speed wind tunnel the sensitivity of ŕow topology within an intake with no fan and no ground in crosswind conditions to changes in either crosswind velocity or engine mass ŕow rate. The ŕow on the intake lip was transonic and there was an open separation of the intake boundary layer on the lower windward quadrant that extended to the nominal fan face location.…”

Section: Introductionmentioning

confidence: 99%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

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The next generation of ultrahigh bypass ratio civil aero-engines promises notable engine cycle benefits. However, these benefits can be significantly eroded by a possible increase in nacelle weight and drag due to the typical larger fan diameters. More compact nacelles, with shorter intakes, may be required to enable a net reduction in aero-engine fuel burn. The aim of this paper is to assess the influence of the design style of short intakes on the unsteady interaction under crosswind conditions between fan and intake, with a focus on the separation onset and characteristics of the boundary layer within the intake. Three intake designs were assessed, and a hierarchical computational fluid dynamics (CFD) approach was used to determine and quantify primary aerodynamic interactions between the fan and the intake design. Similar to previous findings for a specific intake configuration, both intake flow unsteadiness and the unsteady upstream perturbations from the fan have a detrimental effect on the separation onset for the range of intake designs. The separation of the boundary layer within the intake was shock driven for the three different design styles. The simulations also quantified the unsteady intake flows with an emphasis on the spectral characteristics and engine-order signatures of the flow distortion. Overall, this work showed that is beneficial for the intake boundary layer to delay the diffusion closer to the fan and reduce the preshock Mach number to mitigate the adverse unsteady interaction between the fan and the shock.

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Section: Introductionmentioning

confidence: 99%

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Boscagli,

MacManus,

Christie

et al. 2023

Journal of Engineering for Gas Turbines and Power

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show abstract

Surrogate-based optimization of nacelle intake with fan-intake interaction: Mitigating flow separation under crosswind

Yang,

Cao,

Wang

et al. 2023

Aerospace Science and Technology

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Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance

Naruse

Ishii

Oinuma

et al. 2022

Transactions of the JSME (In Japanese)

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This paper describes an experimental study on inlet distortion in the flow ingested to an intake of a ducted fan. Recent high bypass ratio engines tend to shorten the nacelle length for better fuel consumption. In return, the shorter the nacelle intake, the more intensive the inlet distortion inside the intake, which leads to deteriorating fan aerodynamic performance and intensifying the fan noise. This study aims at understanding the influence of intake geometries on the distortion ingested to a ducted fan and thus the fan noise caused by the interaction of the distortion with the fan blades. A subscale fan (fan simulator) coupled with intake models were used in the experiment. The intake models with different axial lengths were prepared to compare the distortion in front of the fan. One is a nominal intake as a reference. The other intake has a short non-dimensional distance from the lip to the fan surface. Crosswind conditions were imposed to realize a clearer influence of the distortion on the acoustic and aerodynamic parameters. According to the experimental results, the intake models provided a distinct increase in sound pressure levels inside the intake. It is anticipated that the sound amplification is attributed to the distortion associated with the intake lip geometry, intake length, and crosswind speed. Non-dimensional total pressure distribution revealed the high correlation between the fan noise and the inlet distortion.

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Characterization and Control of Nacelle Inlet Flow in Crosswind

Cited by 4 publications

References 8 publications

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Effect of Unsteady Fan-Intake Interaction on Short Intake Design

Surrogate-based optimization of nacelle intake with fan-intake interaction: Mitigating flow separation under crosswind

Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance

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