Effect of elastic deformation on the trajectory of aerial separation

Hua, Ruhao; Zhao, Chengxi; Ye, Zhengyin; Jiang, Yuewen

doi:10.1016/j.ast.2015.04.015

Cited by 26 publications

(19 citation statements)

References 20 publications

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“…The hybrid unstructured grid is used for spatial discretization, which is flexible to handle the geometrically complex models [15] . The grids near the wall are prism cells and the others are tetrahedral cells.…”

Section: Simulation Methodsmentioning

confidence: 99%

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The interference aerodynamics caused by the wing elasticity during store separation

Yang

2016

Acta Astronautica

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Air-launch-to-orbit is the technology that has stores carried aloft and launched the store from the plane to the orbit. The separation between the aircraft and store is one of the most important and difficult phases in Air-launch-to-orbit technology. There exists strong aerodynamic interference between the aircraft and the store in store separation. When the aspect ratio of the aircraft is large, the elastic deformations of the wing must be considered. The main purpose of this article is to study the influence of the interference aerodynamics caused by the elastic deformations of the wing to the unsteady aerodynamics of the store. By solving the coupled functions of unsteady Navier-Stokes equations, six degrees of freedom dynamic equations and structural dynamic equations simultaneously, the store separation with the elastic deformation of the aircraft considered is simulated numerically. And the interactive aerodynamic forces are analyzed. The study shows that the interference aerodynamics is obvious at earlier time during the separation, and the dominant frequency of the elastic wing determines the aerodynamic forces frequencies of the store. Because of the effect of the interference aerodynamics, the roll angle response and pitch angle response increase. When the store is mounted under the wingtip, the additional aerodynamics caused by the wingtip vortex is obvious, which accelerate the divergence of the lateral force and the lateral-directional attitude angle of the store. This study supports some beneficial conclusions to the engineering application of the air-launch-to-orbit.

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Section: Simulation Methodsmentioning

confidence: 99%

“…And the weighted distance method is employed to distribute the displacements of surfaces. More details are given in Reference [15][16].…”

Section: Simulation Methodsmentioning

confidence: 99%

The interference aerodynamics caused by the wing elasticity during store separation

Yang

2016

Acta Astronautica

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“…The CFD module is used to calculate the aerodynamic forces of the aircraft. The governing equations are unsteady, three dimensional Navier-Stokes equations, and are described by the Arbitrary Lagrangian-Eulerian (ALE) method [14,24] . The conservation form of Navier-Stokes equations written in earth-fixed rectangular coordinate system is as follows:…”

Section: A Cfd Modulementioning

confidence: 99%

“…The conservative variables of the current time step Q n can be solved with pseudo time iterative method. And in this paper, the Gauss-Seidel method is used for pseudo time marching and AUSM+ scheme is used for spatial discretization [14,[23][24][25] .…”

Section: A Cfd Modulementioning

confidence: 99%

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The influence of the elastic vibration of the carrier to the aerodynamics of the external store in air-launch-to-orbit process

Yang

2016

Acta Astronautica

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The separation between the carrier and store is one of the most important and difficult phases in Air-launch-to-orbit technology. Based on the previous researches, the interference aerodynamic forces of the store caused by the carrier are obvious in the earlier time during the separation. And the interference aerodynamics will be more complex when considering the elastic deformation of the carrier. Focusing on the conditions that in the earlier time during the separation, the steady and unsteady interference aerodynamic forces of the store are calculated at different angle of attacks and relative distances between the carrier and store. During the calculation, the elastic vibrations of the carrier are considered. According to the cause of formations of the interference aerodynamics, the interference aerodynamic forces of the store are divided into several components. The relative magnitude, change rule, sphere of influence and mechanism of interference aerodynamic forces components of the store are analyzed quantitatively. When the relative distance between the carrier and store is small, the interference aerodynamic forces caused by the elastic vibration of the carrier is about half of the total aerodynamic forces of the store. And as the relative distance increases, the value of interference aerodynamic forces decrease. When the relative distance is larger than twice the mean aerodynamic chord of the carrier, the values of interference aerodynamic forces of the store can be ignored. Besides, under the influence of the steady interference aerodynamic forces, the lift characteristics of the store are worse and the static stability margin is poorer.

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Tube-Based Composite Fault-Tolerant Control Method for Flexible Hypersonic Vehicle

Hu,

Tang,

et al. 2024

Int. J. Aeronaut. Space Sci.

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Effect of elastic deformation on the trajectory of aerial separation

Cited by 26 publications

References 20 publications

The interference aerodynamics caused by the wing elasticity during store separation

The interference aerodynamics caused by the wing elasticity during store separation

The influence of the elastic vibration of the carrier to the aerodynamics of the external store in air-launch-to-orbit process

Tube-Based Composite Fault-Tolerant Control Method for Flexible Hypersonic Vehicle

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