Correlation of Weapon Bay Resonance and Store Unsteady Force and Moment Loading

Coley, Christopher; Lofthouse, Andrew J.

doi:10.2514/6.2012-415

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…The cavity is widely used in the advanced flight vehicle. However, there are also some new aerodynamic characteristic when cavity is exposed in high-speed flow, the flow inside the cavity is complicated and include some serious phenomenon such as the flow separation, wave/vortex interference, shock/shear interference, which may generate aerodynamic noise and break the structure of the cavity and flight vehicle [1][2][3]. So the research of high-speed cavity is extremely important to the cavity design.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristic Study of High-speed Cavity Based on Detached-eddy Simulations

Zheng

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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The cavity is widely used in the advanced flight vehicle. However, there are also some new aerodynamic characteristic when cavity is exposed in high-speed flow. The flow characteristic of high-speed cavity is studied in this paper based on detached-eddy simulation method. The M219 cavity benchmark under transonic flow is used as the validation case for numerical methods and grid strategy. Comparison of predicted sound pressure levels and spectra against the wind tunnel experiment has proved that the numerical methods capture the major oscillation dynamics inside the cavity. The aerodynamic characteristic of cavity with a store is investigated in this paper, there are three vortexes in the cavity and the main vortex in the middle rotates around the store. The shear layer breaks earlier compared with clean cavity due to the turbulent flow around the store. However, the small store has little influence to the sound pressure level of cavity.

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Section: Introductionmentioning

confidence: 99%

Flow Characteristic Study of High-speed Cavity Based on Detached-eddy Simulations

Zheng

Zhang

et al. 2022

J. Phys.: Conf. Ser.

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“…Numerical results indicate that the second and third self-oscillation mode contain the most energy [5]. Although characteristics of supersonic cavity flow and aeroacoustic loading [11,12] have been widely understood, only several studies concentrate on the flow-induced vibration. Wang X. S. [13] found that structural vibration frequency is close to natural frequency of the cavity structure and the lower mode dominates vibration behavior.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced vibration in the compressible cavity flow

Li¹,

Tan²,

Hou³

2017

Vib. proced.

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Abstract. The cavity plays an important role in the fuel-air mixing and combustion stability inside the hypersonic scramjet. However, the high levels of time-dependent loading resulting from the supersonic cavity flow can cause intense structural vibration even damage. Experiments and numerical simulations were performed to understand the complex fluid-structure interaction in this paper. A cantilever plate with a cavity was installed as a splitter plate in the supersonic mixing layer wind tunnel. The response displacements of this cantilever plate were measured by a nonintrusive laser vibrometer. Large eddy simulation (LES) was applied to calculate the aerodynamic loading. Results show that the number of time-dependent surface-averaged pressure difference agrees well with semi-empirical relation of Heller used to predict the resonance mode. The cantilever plate exhibits a directly dependent response to self-oscillation of supersonic cavity flow. Measurement results of displacement indicate that the vibration shape of this plate is dominantly two-dimensional.

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Investigation of store separation characteristics by leading edge spoilers before supersonic cavity

Cui

Tang

et al. 2020

J. Phys.: Conf. Ser.

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The internal cavity is widely used on new generation aircraft. However, there are some new aerodynamic and acoustic issues accompanied with the internal cavity. Store separation is a challenge when separated from a high-speed cavity, the store usually generates nose-up pitch moment due to the separated flow and large static pressure gradient, which is a threat to store separation safety. Leading edge spoiler is an effective passive flow control method to improve the store separation characteristics, however the effects of varisized leading edge spoiler on store separation characteristics are still unknown. In this paper, a parameterized leading edge spoiler model is established to investigate the store separation characteristics by leading edge spoilers flow control before supersonic cavity, a small aspect ratio fly-wing aircraft and a simplified store model are employed to simulate the store separation characteristics. Numerical results show that the leading edge spoiler lifts the shear layer and significantly changes the pressure distribution inside the cavity, which makes the store a nose down pitch angle during separation. The height of leading edge spoiler greatly influences the store separation characteristics for it changes the shear layer and vortex structure. The angle of spoiler and the gas between spoiler and aircraft also have great effects on store separation, larger angle and smaller gas lead to less nose-up angle.

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Correlation of Weapon Bay Resonance and Store Unsteady Force and Moment Loading

Cited by 12 publications

References 12 publications

Flow Characteristic Study of High-speed Cavity Based on Detached-eddy Simulations

Flow Characteristic Study of High-speed Cavity Based on Detached-eddy Simulations

Flow-induced vibration in the compressible cavity flow

Investigation of store separation characteristics by leading edge spoilers before supersonic cavity

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