Simulation of Trajectories of Cuboid Cargos Released from a Generic Transport Aircraft

Schade, Niko

doi:10.2514/6.2011-3959

Cited by 12 publications

(10 citation statements)

References 4 publications

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“…While for cargo airdrop simulations in a wind tunnel special attention has to be applied to the correct scaling of the mass of the cargo 28 , it has negligible influence on static measurements. However, one important aspect of scaling of cargo simulation is that the wind tunnel speed needs to be scaled proportional to the square root of the scaling factor 28 . This implies that the relevant wind tunnel velocities will be relatively low.…”

Section: B Mounting Of Cargo and Parachute Modelsmentioning

confidence: 99%

“…In the first project a validation experiment has been carried out for the investigation of the flow topology on a transport aircraft with an open ramp 22 . The validated numerical flow fields have been subsequent used in cargo drop simulations [27][28][29] . The focus in the follow-on project MiTraPor II is on the assessment of flow fields on actual, yet simplified, cargo configurations.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the flow field topology for several cargo drop configurations

Roosenboom

Schröder

Geisler

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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Various cargo drop configurations have been analyzed using stereoscopic Particle Image Velocimetry (SPIV). The PIV measurement planes were located at several positions in the wake of a generic transport aircraft model with an open ramp. The stream-and spanwise positioning of the wind tunnel model was facilitated by means of positioning mechanism of the wind tunnel facility. The first measured configuration consisted of only the wake of the transport aircraft. The cargo configurations consisted of a model of a cargo container, including a rigid parachute and a cargo with an airdrop support platform. A fixed haltering mechanism was used to keep the cargo at a fixed position behind the wind tunnel model for the PIV measurements. The resulting velocity fields (obtained at several chord wise positions) are used to discuss the flow topologies for these airdrop configurations. Nomenclature L, H, B = length, height and width of cargo model Re C = Reynolds number based chord length of wind tunnel model Re H = Reynolds number based on height of cargo model U ∞ = free stream velocity |V| = magnitude of velocity x, y, z = Cartesian axis system u, v, w = velocity component in x, y and z-direction, respectively α = angle of attack

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Section: B Mounting Of Cargo and Parachute Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the flow field topology for several cargo drop configurations

Roosenboom

Schröder

Geisler

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

View full text Add to dashboard Cite

show abstract

“…The wind tunnel model of the FMTA additionally houses a mechanical airdrop mechanism in the cargo compartment which served as ejection mechanism. 20 The 1:21 scale wind tunnel model of the FMTA has a wing span of approx. 2000 mm.…”

Section: Iia Description Of Airdrop Configurationsmentioning

confidence: 99%

Development and Validation of a RANS-based Airdrop Simulation Approach

Geisbauer

Schmidt

2015

33rd AIAA Applied Aerodynamics Conference

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During the first few seconds of an airdrop the payload interacts with the flow field behind the aircraft. As most airdrop simulation tools rely on simplified aerodynamic models, e.g. ones with frozen wind field information, DLR has developed an alternative simulation approach. It computes the aerodynamic interference effects during the initial phase of an airdrop and the resulting trajectory. To achieve this the DLR TAU flow solver has been coupled with the multi-body simulation software SIMPACK. The major advantage of this approach, apart from the fact that it does not rely on simplified aerodynamic models, is its multi-body functionality. Thus, the relative motion of bodies, for example between payload and parachute, can easily be examined as kinematic constraints are considered. DLR has successfully demonstrated that its airdrop simulation approach is well-suited to predict the trajectories of different cargo and cargo-parachute configurations. An overview on the methodology, the verification and validation of this approach is presented in the following.

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“…For this, bodies with a rather simple geometry like cuboids and hemispherical shells were selected to serve as prototypes for scaled wind tunnel tests, for CFD-computations and for flight-dynamical simulation. The same configurations were used to validate the CFD and flight-dynamical simulations with the wind tunnel results and to verify both simulations against each other [19][20] . This work was conducted in a joint effort between the Institute of Aerodynamics and Flow Technology and the Institute of Flight Systems within the internal DLR-project MiTraPor II.…”

Section: Introductionmentioning

confidence: 99%

Approximated Steady Aerodynamic Characteristics for two Cuboids and a Hemispherical Shell used in Airdrop Simulation

Jann

Geisbauer

2013

AIAA Aerodynamic Decelerator Systems (ADS) Conference

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The paper presents the approach and the results from the CFD analysis and the further evaluation of the aerodynamics characteristics of three different bluff body shapes used in an airdrop and parachute simulation. In a joint effort between the Institute of Aerodynamics and Flow Technology and the Institute of Flight Systems within the internal DLR-project MiTraPor II, aerodynamic coefficients for two cuboids and a hemispherical shell representing scaled models of payloads and parachute were evaluated. The evaluation of the aerodynamic coefficients is based on a CFD analysis of a first cuboid with an aspect ratio of 11 x 9 x 5, a second cuboid (or semi-cube) with 11 x 9 x 9 and a hemispherical shell. The analysis covers the full 360° angle of attack range with a sideslip angle of zero, and additional points at β ≠ 0. For being used within the airdrop and parachute simulation, the CFD results were post-processed to obtain analytical approximations for the steady aerodynamic coefficients.

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Simulation of Trajectories of Cuboid Cargos Released from a Generic Transport Aircraft

Cited by 12 publications

References 4 publications

Experimental investigation of the flow field topology for several cargo drop configurations

Experimental investigation of the flow field topology for several cargo drop configurations

Development and Validation of a RANS-based Airdrop Simulation Approach

Approximated Steady Aerodynamic Characteristics for two Cuboids and a Hemispherical Shell used in Airdrop Simulation

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