Computational investigation and passive control of vehicle sunroof buffeting

He, Yansong; Zhang, Quanzhou; An, Changfa; Wang, Yong; Xu, Zhongming; Zhang, Zhifei

doi:10.1177/1077546319889784

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…For example, during cold winter months (or hot summer months) the strong blast of incoming air along with its buffeting noise can be discomforting to the occupants. 42,43 Moreover, the ventilation rates computed for fully open windows were well in excess of the typically recommended values in most ventilation guidelines. 27,44 Therefore, it may be worthwhile to explore partially open windows as a practical compromise when the driving speeds are sufficiently high, and a few alternate ventilation strategies when the driving speeds are low.…”

Section: Introductionmentioning

confidence: 88%

Aerosol transmission in passenger car cabins: Effects of ventilation configuration and driving speed

2022

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Identifying the potential routes of airborne transmission during transportation is of critical importance to limit the spread of the SARS-CoV-2 virus. Here, we numerically solve the Reynolds-averaged Navier–Stokes equations along with the transport equation for a passive scalar in order to study aerosol transmission inside the passenger cabin of an automobile. Extending the previous work on this topic, we explore several driving scenarios including the effects of having the windows fully open, half-open, and one-quarter open, the effect of opening a moon roof, and the scaling of the aerosol transport as a function of vehicle speed. The flow in the passenger cabin is largely driven by the external surface pressure distribution on the vehicle, and the relative concentration of aerosols in the cabin scales inversely with vehicle speed. For the simplified geometry studied here, we find that the half-open windows configuration has almost the same ventilation effectively as the one with the windows fully open. The utility of the moonroof as an effective exit vent for removing the aerosols generated within the cabin space is discussed. Using our results, we propose a “speed–time” map, which gives guidance regarding the relative risk of transmission between driver and passenger as a function of trip duration and vehicle speed. A few strategies for the removal of airborne contaminants during low-speed driving, or in a situation where the vehicle is stuck in traffic, are suggested.

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Section: Introductionmentioning

confidence: 88%

Aerosol transmission in passenger car cabins: Effects of ventilation configuration and driving speed

2022

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“…However, due to limitations in the actuator’s bandwidth and the energy required, the practical application of these methods is currently rare or uncommon. 5 Therefore, passive control methods such as deflectors, 6 sub-cavities, 7 leading-edge shapes, 8 etc., are still widely used. For example, Wang et al 9 and Zhang et al 10 improved the leading-edge shapes to increase the thickness of the boundary layer at the leading edge, resulting in a reduction of cavity noise by more than 10 dB.…”

Section: Introductionmentioning

confidence: 99%

Exploring the suppression mechanism of wind buffeting noise with bionic structures featuring leading-edge serrations and surface ridges

Cao

Zhang

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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The aim of this study is to investigate the effectiveness and mechanism of wind buffeting noise suppression using a new bionic structure inspired by the quiet flight of owls. Firstly, the new bionic schemes based on NACA0012 wing with two sinusoidal leading-edge serrations and one straight leading-edge curve are used in a cavity after verifying the simulation. Then, the results of the three bionic schemes are compared and analyzed. It is found that the schemes with leading-edge serrations and surface ridges can suppress wind buffeting noise effectively. In particular, the sinusoidal scheme with a wavelength λ = 0.24 c (chord length c) can significantly reduce resonance energies above 21 dB over a wide range of speeds. Furthermore, the study reveals that in the bionic scheme, only the negative pressure core moves in the opening and hits the trailing edge, which reduces the pressure fluctuation in the cavity. The boundary layer thickness (BLT) also fluctuates in span under the influence of the leading-edge serration and the surface ridge, which is favorable for suppressing wind buffeting noise. However, the suppression effect is not solely related to the fluctuation of BLT in the span at the trailing edge but is also influenced by the minimum BLT at this point. Therefore, if the BLT has a certain intensity fluctuation in the span, and the minimum BLT at the trailing edge is close to that of the smooth airfoil scheme, the noise suppression effect is significant.

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“…The characteristics of sunroof buffeting noise and its control methods have been extensively studied [1][2][3][4][5][6][7][8][9][10]. However, there are few research findings on the characteristics and the control methods of buffeting noise caused by opening the side window.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Optimization of the Front Window Visor for Vehicle Wind Buffeting Noise Reduction Based on Zonal SAS k-ε Method

Yang

Liu

2022

Applied Sciences

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Numerical investigations were conducted to determine the effectiveness of the front window visor for wind buffeting noise reduction. An unsteady flow simulation was carried out using a zonal Scale Adaptive Simulation (SAS) k-ε turbulence model. Firstly, the accuracy of the simulation method was validated based on a benchmark problem. The benchmark results, frequency, and sound pressure levels of feedback and resonance modes all matched well with the experimental data. The effect of the front window on the buffeting noise reduction was numerically investigated based on three different front side window openings. The analysis focused on the suppression effect of the front window visor. The results show that the front window visor changed the A-pillar vortex shedding trajectory and thus reduced the driver’s ear pressure fluctuation. On this basis, an optimization algorithm was employed to optimize the shape of the front window visor. The main design goal was to decrease the sound pressure level (SPL) values of the driver’s left ear. Simulation results showed that the monitoring point’s SPL of buffeting noise after the visor optimization was reduced by 12.6%, compared with that of the original visor.

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Computational investigation and passive control of vehicle sunroof buffeting

Cited by 9 publications

References 18 publications

Aerosol transmission in passenger car cabins: Effects of ventilation configuration and driving speed

Aerosol transmission in passenger car cabins: Effects of ventilation configuration and driving speed

Exploring the suppression mechanism of wind buffeting noise with bionic structures featuring leading-edge serrations and surface ridges

Numerical Analysis and Optimization of the Front Window Visor for Vehicle Wind Buffeting Noise Reduction Based on Zonal SAS k-ε Method

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