Summary of NASA stall/spin research for general aviation configurations

Chambers, J.; Stough, H. Paul

doi:10.2514/6.1986-2597

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…The phenomenon of stall and spin has received continuous attention from the aeronautical industry since the early days of flight [1]. An aircraft spin is an autorotating descent in a helical pattern about the vertical axis [2].…”

Section: Introductionmentioning

confidence: 99%

Unsteady aerodynamics analysis and modelling of a Slingsby Firefly aircraft: Detached-Eddy Simulation model and flight test validation

Neves

Lawson

Bennett

et al. 2020

Aerospace Science and Technology

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This paper presents unsteady stall characteristics of a Slingsby T67M260 Firefly light aircraft from both a computational fluid dynamics (CFD) half model and flight tests. Initial results from the steady CFD, based on a RANS k − ω SST turbulence model, established the critical angle of attack of the stall to be α stall = 16 • , with a maximum lift coefficient of CLmax = 1.2. Comparisons with straight and level flight test data were comparable up to α = 12 • -14 • , with the increasing deviation at higher α attributed to the effect of the propeller slipstream under these flight conditions. The RANS CFD model was then extended to an unsteady Detached-Eddy Simulation (DES) model for three angles of attack at pre-stall and stall condition (α = 14 • , 16 • , 18 • ), with analysis of the vortex shedding frequency. Further comparisons were then made with flight test data taken using on-board accelerometers and wing tuft surface flow visualization, at a stalled condition at equivalent α. These unsteady CFD data established a dominant shedding frequency ranging from 11.7 Hz -8.74 Hz with increasing α and a Strouhal number based on wing chord of St = 0.11, which when compared to flight test accelerometer spectra matched within 2.9% of the measured frequency.

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Section: Introductionmentioning

confidence: 99%

Unsteady aerodynamics analysis and modelling of a Slingsby Firefly aircraft: Detached-Eddy Simulation model and flight test validation

Neves

Lawson

Bennett

et al. 2020

Aerospace Science and Technology

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“…Government/industry research, such as the NASA High Alpha Program (HATP) 4 , made significant contributions to the understanding of stability and control, flow physics, and computational methods for these conditions. Another category of airplanes, light general aviation, was the subject of ground and flight research in the 1980's, due to the stall/spin accident rate, that resulted in advanced spin-resistant wing designs and simulation modeling methods 5 . Primarily based on this previous research, an experimental wind tunnel test program for large transport configurations was chosen as a viable approach to measure and study aerodynamic characteristics for upset conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Modeling and Simulation of Large Transport Airplanes in Upset Conditions

Foster

Cunningham

Fremaux

et al. 2005

AIAA Guidance, Navigation, and Control Conference and Exhibit

117

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As part of NASA's Aviation Safety and Security Program, research has been in progress to develop aerodynamic modeling methods for simulations that accurately predict the flight dynamics characteristics of large transport airplanes in upset conditions. The motivation for this research stems from the recognition that simulation is a vital tool for addressing loss-of-control accidents, including applications to pilot training, accident reconstruction, and advanced control system analysis. The ultimate goal of this effort is to contribute to the reduction of the fatal accident rate due to loss-of-control. Research activities have involved accident analyses, wind tunnel testing, and piloted simulation. Results have shown that significant improvements in simulation fidelity for upset conditions, compared to current training simulations, can be achieved using state-of-the-art wind tunnel testing and aerodynamic modeling methods. This paper provides a summary of research completed to date and includes discussion on key technical results, lessons learned, and future research needs.

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“…This similarity is not surprising, since in the NASA subscale spin studies, it was found that for some aircraft the correlation with full-scale data was remarkable. 11 What is notable, however, is that this data was obtained with off-the-shelf equipment costing less than $2000.…”

Section: B Developed Spin Characteristicsmentioning

confidence: 91%

Stall/Spin Flight Test Techniques with COTS Model Aircraft and Flight Data Systems

Bunge

Savino

Kroo

2015

AIAA Flight Testing Conference

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This paper presents methodologies and techniques for stall/spin flight testing using commercially off-the-shelf model aircraft and flight data systems. Flight test procedures allowing systematic and efficient testing are outlined, as well as piloting techniques to obtain quality spin flight data. Two spin flight test campaigns with different testbeds are described, including the aircraft, flight data system and ground station setups. Flight test data for the two testbeds are presented and the incipient, developed and recovery characteristics are analyzed. The spin data is consistent across spin maneuvers for a given aircraft, and also similar between aircrafts of different scale, showing the accuracy of the flight test methodology and instrumentation. Nomenclature bwing span CG center of gravity V airspeed at the center of gravity V stallStall speed Re stall Reynolds number at stall p, q, r roll, pitch and yaw rates Ω spin rate, Ω (p 2 + q 2 + r 2 ) 1/2

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Summary of NASA stall/spin research for general aviation configurations

Cited by 9 publications

References 11 publications

Unsteady aerodynamics analysis and modelling of a Slingsby Firefly aircraft: Detached-Eddy Simulation model and flight test validation

Unsteady aerodynamics analysis and modelling of a Slingsby Firefly aircraft: Detached-Eddy Simulation model and flight test validation

Dynamics Modeling and Simulation of Large Transport Airplanes in Upset Conditions

Stall/Spin Flight Test Techniques with COTS Model Aircraft and Flight Data Systems

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