Computational fluid dynamics study of an abrupt wing stall phenomena on the F/A-18E

Grove, Darren; Laiosa, Joseph P.; Woodson, Shawn H.; Stookesberry, D.

doi:10.2514/6.2002-1025

Cited by 11 publications

(3 citation statements)

References 2 publications

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“…Figure 2 illustrates the upper surface flow on the wing of a pre-production F/A-18E computed using WIND for Mach 0.8 at AoA = 8 and 9 degrees. 7 Once again, the higher velocity flow is shown in blue and the lower speed (mostly separated) flow is depicted in green/yellow. Also included are surface-restricted particle traces at a point just off the wing surface, which are analogous to experimental oil flow patterns.…”

Section: Sensitivity Of Aws Flow Phenomenamentioning

confidence: 90%

Recommendations for CFD Procedures for Predicting Abrupt Wing Stall

Woodson¹,

Green²,

Chung³

et al. 2003

41st Aerospace Sciences Meeting and Exhibit

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This paper summarizes the lessons learned from the computational fluid dynamics (CFD) effort of the joint NASA/Navy/Air Force Abrupt Wing Stall (AWS) Program, discusses the results, and makes recommendations for approaches to be used in future aircraft programs to identify uncommanded lateral characteristics early in the design phase of an aircraft development program. The discussion also suggests CFD procedures and figures of merit for use in predicting and quantifying AWS tendencies and vulnerabilities of the proposed designs. Topics addressed include critical parameters that can be used to identify uncommanded lateral activity in the transonic flow regime, and the geometric parameters that were the primary contributors to the adverse lateral activity observed on pre-production F/A-18E/F aircraft. In addition, differences in steady-state and averaged time-accurate CFD solutions for the F/A-18E in the AWS region of interest are analyzed and compared with existing unsteady experimental data to determine the utility and accuracy of the unsteady approach. Lastly, proposed CFD figures of merit are critically evaluated as indicators of possible AWS tendencies, and screening procedures for the identification of AWS are suggested.

show abstract

Section: Sensitivity Of Aws Flow Phenomenamentioning

confidence: 90%

Recommendations for CFD Procedures for Predicting Abrupt Wing Stall

Woodson¹,

Green²,

Chung³

et al. 2003

41st Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

show abstract

“…Figure 2 illustrates the upper-surface flow on the wing of a preproduction F/A-18E computed using WIND for Mach 0.8 at AoA = 8 and 9 deg (Ref. 7). Once again, the higher velocity flow is shown in blue and the lower speed (mostly separated) flow is depicted in green/yellow.…”

Section: Sensitivity Of Aws Flow Phenomenamentioning

confidence: 99%

Recommendations for Computational-Fluid-Dynamics Procedures for Predicting Abrupt Wing Stall

Woodson

Green

Chung

et al. 2005

Journal of Aircraft

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This paper summarizes the lessons learned from the computational-fluid-dynamics effort of the joint NASA/Navy/Air Force Abrupt Wing Stall Program, discusses the results, and makes recommendations for approaches to be used in future aircraft programs to identify uncommanded lateral characteristics early in the design phase of an aircraft development program. The discussion also suggests procedures and figures of merit for use in predicting and quantifying rapid and severe wing-stall tendencies and vulnerabilities of the proposed designs. Topics addressed include critical parameters that can be used to identify uncommanded lateral activity in the transonic flow regime and the geometric parameters that were the primary contributors to the adverse lateral activity observed on preproduction F/A-18E/F aircraft. In addition, differences in steady-state and averaged time-accurate computational solutions for the F/A-18E in the abrupt-wing-stall region of interest are analyzed and compared with existing unsteady experimental data to determine the utility and accuracy of the unsteady approach. Lastly, proposed computational figures of merit are critically evaluated as indicators of possible abrupt separation tendencies, and screening procedures for the identification of those tendencies are suggested.

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“…Abrupt stall degrades the tracking capability of the aircraft and causes safety concerns if it occurs at low altitudes. 1 Modifications of the automatic leading-edge flap schedule and the addition of a porous surface at the wing fold solved the abrupt stall problem on the F/A-18E/F and were incorporated into the production versions of the aircraft. As a result of the modifications, the F/A-18E/F's being delivered to the fleet are no longer susceptible to AWS.…”

Section: Introductionmentioning

confidence: 99%

F/A-18C to E Wing Morphing Study for the Abrupt Wing Stall Program

Green

Ott

2003

41st Aerospace Sciences Meeting and Exhibit

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. AbstractIn an effort to determine the impact of various wing parameters on the abrupt wing stall phenomenon encountered by the pre-production F/A-18E, various characteristics of the F/A-18C wing were modified to reflect the design changes incorporated into the F/A-18E wing.The parameters evaluated during this study included thickness, camber, twist, leading-edge radius, leading-edge flap-chord ratio and the addition of a leading-edge snag. The wing parameters were modified independently and then in combination to determine their impact on the abrupt stall.

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Computational fluid dynamics study of an abrupt wing stall phenomena on the F/A-18E

Cited by 11 publications

References 2 publications

Recommendations for CFD Procedures for Predicting Abrupt Wing Stall

Recommendations for CFD Procedures for Predicting Abrupt Wing Stall

Recommendations for Computational-Fluid-Dynamics Procedures for Predicting Abrupt Wing Stall

F/A-18C to E Wing Morphing Study for the Abrupt Wing Stall Program

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