Further development of the influence function method for store aerodynamic analysis

Cenko, A.; Meyer, Rudolf X.; Tessitore, F.

doi:10.2514/3.45358

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…During the 1980s, as computational capabilities improved significantly, more advanced CFD simulations, such as the influence function method (IFM) (6,7) , were developed to help determine loads and moments for external stores. The IFM method used CFD to determine the aircraft flow field which was used to quantify the impact of the flow field on stores, with resultant store aerodynamic coefficients applied to determine store trajectories with a six-degree-of-freedom (6-DOF) programme.…”

Section: Literature Reviewmentioning

confidence: 99%

Effects of targeting pod modification on F/A-18C Hornet weapons release

O'Brien

Snyder

Hallberg

et al. 2012

Aeronaut. j. (1968)

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This paper describes a study that investigated the efficacy of modifications to the trailing end of the externally mounted advanced targeting forward looking infrared pod (ATFLIR) on the store separation characteristics of the F/A-18C aircraft. Prior work by Godiksen suggests that the trailing end of the geometrically similar targeting forward looking infrared pod (TFLIR) is the likely source of shock waves that can adversely impact the trajectory of a recently released store. In our study five different modifications to the aft end of the ATFLIR were analysed using computational fluid dynamics (CFD). The two most promising designs, an ogive shape such as that used in artillery shells and rockets, and a simpler extended but truncated cone shape were then further investigated. The moments that these trailing shapes produced on an adjacent released store were compared. CFD analysis revealed that the simpler cone shape resulted in weaker shocks from the aft end of the pod with a resultant smaller adverse moment on the store. While there is an extensive history of using CFD to predict store separation behavior, results from our study should be compared with wind tunnel data in order to validate the CFD simulations. NOMENCLATURE 6-DOFsix-degree of freedom AOA angle-of-attack ATFLIR advanced targeting forward looking infrared pod C D drag coefficient CFD computational fluid dynamics

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Section: Literature Reviewmentioning

confidence: 99%

Effects of targeting pod modification on F/A-18C Hornet weapons release

O'Brien

Snyder

Hallberg

et al. 2012

Aeronaut. j. (1968)

Self Cite

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“…There have been several challenges for aerodynamic predictions of carriage loads and trajectories of different stores by using CFD analysis. Some of them may be listed as F-16/Generic Finned Store trajectory prediction challenge [2,3,4,5,6] , F-18/Joint Direct Attack Munition (JDAM) trajectory prediction challenge [7,8,9,10] and finally F-18C/MK-83 store transonic pressure prediction challenge for which comparisons were made with Pressure Sensitive Paint (PSP) data taken from flight tests [11] . All challenges showed that, numerical methods are mature enough to predict the store trajectories even with an Euler mesh.…”

Section: Introductionmentioning

confidence: 99%

Captive Carry Analyses and Test Results of General Purpose Munition Bomb

Basoglu

Atik

Yildiz

2011

29th AIAA Applied Aerodynamics Conference

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Prediction of aerodynamic, thermal and vibrational loadings on a store, which is carried out on an aircraft is an important criterion in the design area having the objective to define flight envelope, release envelope and life cycle of the store. External stores may change maneuverability and flight envelope of the installed flight platform drastically. On the other hand, flight envelope of the aircraft may result in an excessive heating on the electronic equipment of the store and vibration forces may end up with a structural failure. Hence, to predict aerodynamic, thermal and vibrational loadings on an external store during F4 aircraft captive carriage stage, numerical studies are carried out based on simulations and military standards. A CFD based analysis tool is used to predict the pressure variations on the store during different flight regimes of the aircraft. Fully viscous, second order structured finite volume solutions are obtained for subsonic and transonic flight regimes. Change in inner and outer temperature values of the store was determined for certain flight conditions by making the heat transfer analysis of the external store with the help of 2-D and 3-D numerical methods, including radiation, convection, conduction heat transfers and the aerodynamic heating effects. An F4 fighter aircraft is instrumented for collecting the required data to verify the analysis tools and calculated data. The results of numerical predictions are compared and verified with the test data. The comparison graphs between the estimated vibration profiles by MIL-STD 810F and measured profiles are presented. Nomenclature M = pressure probe S = thermal probe PSD = power spectral density T ∞ = free stream static temperature P ∞ = free stream static pressure H = altitude above sea level (m)  = angle of attack ( o )  = angle of sideslip ( o ) M# = Mach number T ∞ = free stream temperature P ∞ = free stream pressure

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Experience in the use of computational aerodynamics to predict store release characteristics

Cenko

2001

Progress in Aerospace Sciences

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Further development of the influence function method for store aerodynamic analysis

Cited by 10 publications

References 5 publications

Effects of targeting pod modification on F/A-18C Hornet weapons release

Effects of targeting pod modification on F/A-18C Hornet weapons release

Captive Carry Analyses and Test Results of General Purpose Munition Bomb

Experience in the use of computational aerodynamics to predict store release characteristics

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