Numerical Simulation of Leakage Effects on Sunroof Buffeting of an Idealized Generic Vehicle

Balasubramanian, Ganapathi; Crouse, Bernd; Freed, David

doi:10.2514/6.2009-3348

Cited by 6 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A study by Langtry and Spalart [1] used computational methods to predict the unsteady pressure inside a landing-gear wheel well on commercial aircraft geometry. Balasubramanian et al [2] considered "sunroof buffeting" on simplified vehicle geometry. Nakiboglu et al [3] studied a series of side branch resonators as a model for flow in a corrugated pipe.…”

mentioning

confidence: 99%

Cavity Resonance Suppression Using Fluidic Spoilers

Bennett¹,

Okolo²,

Zhao³

et al. 2019

AIAA Journal

View full text Add to dashboard Cite

This paper examines experimentally the use of a fluidic spoiler to suppress the resonance within a partially closed cylindrical cavity subject to a grazing flow. The relative movement of aircraft and high-speed land-based vehicles through air often results in structural cavities in these vehicles being subject to shear-layer-driven resonance. This can lead to high-amplitude pressure fluctuations within the cavity volume, causing damage to stores or equipment found within landing-gear wheel or weapon bays, for example, or else significant discomfort to the passengers of cars or trains. This large-scale buffeting can also cause vehicle stability problems and can increase drag. This work presents a novel method, in which passive flow control consisting of an upstream fluidic spoiler is used to redirect the upstream flow so that the cavity orifice is shielded. As a result, the grazing flow can no longer detach from the upstream leading edge of the cavity, and thus, vortex shedding is suppressed. The scope of the study includes an examination of higherorder azimuthal acoustic modes excited in the cylindrical cavity: modes which have received little attention in the literature, but which can be readily excited for many flow configurations for partially covered cavities.

show abstract

mentioning

confidence: 99%

Cavity Resonance Suppression Using Fluidic Spoilers

Bennett¹,

Okolo²,

Zhao³

et al. 2019

AIAA Journal

View full text Add to dashboard Cite

show abstract

Experimental Study on the Suppression of Cavity Noise in a Locking-On State by a Slanting Inner Wall

Liu,

Guo

2024

Aerospace

View full text Add to dashboard Cite

This paper presents an experimental investigation into the noise characteristics of various slanted wall configurations. The study focuses on the noise suppression effects of cavities with slanted walls on cavity coupling noise. A total of eight configurations, with different slanting angles on the front and rear walls, were analyzed by varying the inclination of the inner wall. Noise and flow field measurements were conducted in an aeroacoustic wind tunnel, utilizing microphones for near-field and far-field noise data acquisition and hot-wire probes for flow field analysis. The results indicate that larger slant angles lead to more effective noise reduction. As the slant angle increases, the acoustic resonance frequency associated with the slanted inner wall rises, which alters the self-excited oscillation modes involved in coupling with the acoustic resonance. This reduces the impact of coupling on the sound pressure levels. The change in acoustic resonance frequency also modifies the phase delay term of the dominant mode, ultimately leading to a shift in the noise frequency.

show abstract