Computational Aeroelastic Analyses of a Low-Boom Supersonic Configuration

Silva, Walter A.; Sanetrik, Mark D.; Chwalowski, Pawel

doi:10.2514/6.2015-2721

Cited by 5 publications

(9 citation statements)

References 12 publications

(13 reference statements)

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“…Finally, the APE-inviscid fine grid is used as a comparison to the relatively coarse APEinviscid grid used in the majority of the sensitivity studies. Previous grid studies for this concept vehicle have indicated only minor differences between a coarse grid and a fine grid (10 times more points) [19].…”

Section: Ape Model Of N 2 Supersonic Transportmentioning

confidence: 83%

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Aero-Propulso-Elastic Analysis of a Supersonic Transport

Connolly¹,

Kopasakis²,

Chwalowski³

et al. 2020

Journal of Aircraft

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An aeroelastic modeling capability of a flexible aircraft with gas turbine engines is developed using a computational fluid dynamics tool as an integration platform. The new modeling capability allows for the typical aeroelastic analysis to include a nonlinear dynamic model of the turbomachinery that is capable of capturing relevant gas dynamics. An example case of the aero-propulso-elastic (APE) modeling capability is explored for a supersonic transport vehicle with turbofan engines. An overview of the methodology for integrating the propulsion system and elastic vehicle is provided. This is followed by a study to explore coupling sensitivities compared against typical aeroelastic analysis. Dynamic and static vehicle responses are considered across key flight conditions and vehicle-level angles of attack, where the inclusion of the propulsion system has a 10% increase in vehicle wing tip deformations. It is found that the propulsion system is stable at various operating conditions, with structural oscillations having little impact on propulsion system performance. Perceived loudness, a key performance metric for a supersonic transport, is investigated using the APE model. Results lead to an approximately 4 dB increase in noise over a rigid body analysis that neglects the propulsion system. The greatest impacts are shown during off-nominal conditions.

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Section: Ape Model Of N 2 Supersonic Transportmentioning

confidence: 83%

“…Leveraging symmetry, a modal solution was performed on the FEM semispan by properly defining boundary conditions [2,8,19]. The symmetric modes of the vehicle provide adequate coupling for the propulsion system for this sensitivity analysis, which is not investigating off-nominal thrust asymmetries.…”

Section: Vehicle Modelmentioning

confidence: 99%

Aero-Propulso-Elastic Analysis of a Supersonic Transport

Connolly¹,

Kopasakis²,

Chwalowski³

et al. 2020

Journal of Aircraft

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“…2. 3 The key features to note for this study are the long slender vehicle profile and the three gas turbine engines. Two of the engines are mounted under the wing, with a third mounted in the back along the centerline of the fuselage.…”

Section: A N+2 Commercial Supersonic Transport Modelmentioning

confidence: 99%

“…The majority of the FEM was discretized into constant property design zones, and an optimizer was used to adjust the structural properties using the design variables defined within these zones. 3 Skins assumed a sandwich approach consisting of graphite and Bismaleimide (BMI) unidirectional tape with a honeycomb core, resulting in three independent design variables per zone ( either 0, 45, or 90 degree plies; core thickness remains constant in sizing). The design of the substructure also assumed a sandwich approach with graphite and BMI fabric facesheets.…”

Section: Vehicle Dynamic Modelmentioning

confidence: 99%

Towards an Aero-Propulso-Servo-Elasticity Analysis of a Commercial Supersonic Transport

Connolly

Chwalowski

Sanetrik

et al. 2016

15th Dynamics Specialists Conference

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This paper covers the development of an aero-propulso-servo-elastic (APSE) model using computational fluid dynamics (CFD) and linear structural deformations. The APSE model provides the integration of the following two previously developed nonlinear dynamic simulations: a variable cycle turbofan engine and an elastic supersonic commercial transport vehicle. The primary focus of this study is to provide a means to include relevant dynamics of a turbomachinery propulsion system into the aeroelastic studies conducted during a vehicle design, which have historically neglected propulsion effects. A high fidelity CFD tool is used here for the integration platform. The elastic vehicle neglecting the propulsion system serves as a comparison of traditional approaches to the APSE results. An overview of the methodology is presented for integrating the propulsion system and elastic vehicle. Static aeroelastic analysis comparisons between the traditional and developed APSE models for a wing tip deflection indicate that the propulsion system impact on the vehicle elastic response could increase the deflection by approximately ten percent.

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“…3 The Fun3D code has various configuration options to include tools outside of the standard flow solver. NASA is using Fun3D as the primary tool for computational fluid dynamics (CFD) based ASE analysis 4 and it will serve as the analysis environment for the final APSE model. Finally, the stand alone propulsion system model will be coupled into a rigid body supersonic commercial transport in Fun3D.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Modeling of a Supersonic Commerical Transport Turbo-Machinery Propulsion System for Aero-Propulso-Servo-Elasticity Reserach

Connolly

Carlson

Kopasakis

et al. 2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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This paper covers the development of an integrated nonlinear dynamic model for a variable cycle turbofan engine, supersonic inlet, and convergent-divergent nozzle that can be integrated with an aeroelastic vehicle model to create an overall Aero-Propulso-ServoElastic (APSE) modeling tool. The primary focus of this study is to provide a means to capture relevant thrust dynamics of a full supersonic propulsion system by using relatively simple quasi-one dimensional computational fluid dynamics (CFD) methods that will allow for accurate control algorithm development and capture the key aspects of the thrust to feed into an APSE model. Previously, propulsion system component models have been developed and are used for this study of the fully integrated propulsion system. An overview of the methodology is presented for the modeling of each propulsion component, with a focus on its associated coupling for the overall model. To conduct APSE studies the described dynamic propulsion system model is integrated into a high fidelity CFD model of the full vehicle capable of conducting aero-elastic studies. Dynamic thrust analysis for the quasi-one dimensional dynamic propulsion system model is presented along with an initial three dimensional flow field model of the engine integrated into a supersonic commercial transport. NomenclatureA Cross-sectional area N Engine rotational speed M Mach number P Pressure P R Pressure Ratio T Temperature V Volumė m Mass flow t Time x Length η Efficiency γ Ratio of specific heat ρ Density Subscripts c Engine characteristic parameter n Engine component location s Static flow condition t

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Computational Aeroelastic Analyses of a Low-Boom Supersonic Configuration

Cited by 5 publications

References 12 publications

Aero-Propulso-Elastic Analysis of a Supersonic Transport

Aero-Propulso-Elastic Analysis of a Supersonic Transport

Towards an Aero-Propulso-Servo-Elasticity Analysis of a Commercial Supersonic Transport

Nonlinear Dynamic Modeling of a Supersonic Commerical Transport Turbo-Machinery Propulsion System for Aero-Propulso-Servo-Elasticity Reserach

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