Computational estimate of the separation effect

Gaton, V. A.; Harmatz, M.

doi:10.2514/3.46881

Cited by 2 publications

(2 citation statements)

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“…C l , C m , C n = store rolling, pitching, and yawing moment coefficients C mx = moment coefficient in the x direction C x = force coefficient in the x direction dx = displacement in the x direction F i = generalized flux vector H = total enthalpy M 1 = freestream Mach number n = outward normal vector Q = conservative flow variables t = time U, V, W = contravariant velocities along the generalized coordinates U g = grid velocity u, v, w = Cartesian velocity components C x = incremental force coefficient in the x direction , p, e = density, pressure, and total energy , , = roll, yaw, and pitch angles I. Introduction T ARGET point estimation is an important objective in flight tests, as well as safe separation, when weapons are integrated on an aircraft.…”

Section: Nomenclaturementioning

confidence: 99%

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Prediction of Ballistic Separation Effect by Direct Calculation of Incremental Coefficients

Kim

Kwon

Park

2010

Journal of Aircraft

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The ballistic separation effect in an aircraft flowfield was predicted via the direct calculation of incremental coefficients. A highly robust flow solver, including a Chimera grid module, was used to create the trajectory of a released store and to calculate incremental coefficients. The incremental coefficients were computed according to the difference between the aerodynamic coefficients in the aircraft flowfield and in the freestream condition. Two different calculations can be executed simultaneously in a parallel computing environment. The aircraft flowfield effect was measured using the incremental coefficients. This method of direct calculation of the incremental coefficients was tested in the case of released stores in two-dimensional subsonic and supersonic flow regions. The accuracy of the unsteady trajectory calculation was verified through comparisons with the captive trajectory system data in the Eglin wing/pylon/store separation problem. The method was then applied to a generic bomb released from a full-body aircraft. The computational results show that the current method is capable of simulating the store trajectory and investigating aircraft flowfield effects. NomenclatureC l , C m , C n = store rolling, pitching, and yawing moment coefficients= contravariant velocities along the generalized coordinates U g = grid velocity u, v, w = Cartesian velocity components C x = incremental force coefficient in the x direction , p, e = density, pressure, and total energy , , = roll, yaw, and pitch angles

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Section: Nomenclaturementioning

confidence: 99%

“…The store in the bombing function is represented as a point-mass particle located at its center of gravity. Drag force and gravity act upon this element as the computer runs a simulation during every computational cycle (0.02-0.25 s) [1,2].…”

Section: Nomenclaturementioning

confidence: 99%