Turbulence measurements of a personal airflow outlet jet in aircraft cabin

Guo, Yong; Jiang, Nan; Yao, Susu; Dai, Shen; Liu, Junjie

doi:10.1016/j.buildenv.2014.10.007

Cited by 16 publications

(12 citation statements)

References 41 publications

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“…For investigation of the air distribution in aircraft cabins, laboratory tests have been carried out in small cabin mock-ups to characterize the jets along the diffusers, 13 the main flow in the cabin, [14][15][16] thermal plumes from heated manikins, 17 and gasper-induced flow. [18][19][20][21] At the same time, efforts have been made to evaluate contaminant transport in cabins. For instance, Zhang et al 22 measured the air velocity, temperature, and gaseous and particulate contaminant concentrations in a section of a half-occupied, twin-aisle cabin mockup with a mixing ventilation system.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the commercial airliner cabin environment with different air distribution systems

You

Lin

Wei³

et al. 2019

Indoor Air

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Ventilation systems for commercial airliner cabins are important in reducing contaminant transport and maintaining thermal comfort. To evaluate the performance of a personalized displacement ventilation system, a conventional displacement ventilation system, and a mixing ventilation system, this study first used the Wells-Riley equation integrated with CFD to obtain the SARS quanta value based on a specific SARS outbreak on a flight. This investigation then compared the three ventilation systems in a seven-row section of a fully occupied, economy-class cabin in Boeing 737 and Boeing 767 airplanes. The SARS quanta generation rate obtained for the index patient could be used in future studies. For all the assumed source locations, the passengers' infection risk by air in the two planes was the highest with the mixing ventilation system, while the conventional displacement ventilation system produced the lowest risk. The personalized ventilation system performed the best in maintaining cabin thermal comfort and can also reduce the infection risk. This system is recommended for airplane cabins. K E Y W O R D S computational fluid dynamics (CFD), displacement ventilation, infectious disease transmission, mixing ventilation, personalized ventilation, thermal comfort | 841 YOU et al.

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Section: Introductionmentioning

confidence: 99%

Evaluating the commercial airliner cabin environment with different air distribution systems

You

Lin

Wei³

et al. 2019

Indoor Air

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“…The distribution of the turbulence intensity showed symmetrical characteristics, similar to a free jet. After the exhaled flow initial region (x/d > 1), the turbulence intensity increased rapidly, increasing to its maximum at about x/d ¼ 4, much faster than a free jet [39]. As distinct from the isothermal condition, the point at which the turbulence intensity reached its maximum occurred at after x/d ¼ 5 under the heated condition, and the velocity decay was slower in 2.2 < x/d < 5.6.…”

Section: Turbulence Intensitymentioning

confidence: 91%

“…7 shows the local mean velocity U/U c contours (U c is the jet centerline velocity) of the exhaled flow in the middle phase. The liner diffusion exhibited characteristics of a free jet [39]. The tracking radial position in which the mean velocity U/ U c was equal to 0.05 [39] traced a diffusion angle of about 21 under the isothermal condition.…”

Section: Isothermal Conditionmentioning

confidence: 96%

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TR-PIV measurement of exhaled flow using a breathing thermal manikin

Yao

Sun

et al. 2015

Building and Environment

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a b s t r a c tBreathing is a high-risk behavior for spreading infectious diseases in enclosed environments, so it is important to investigate the characteristics of human exhalation flow and dispersal of exhaled air to reduce the risk. This paper used two-dimensional time-resolved particle image velocimetry (2D TR-PIV) to measure the exhaled flow from a breathing thermal manikin. Since the exhaled flow is transient and periodic, the phase-averaged method was used to analyze the flow characteristics. The results showed that the velocity profile of the flow exiting the mouth was bell-shaped for exhalation and flat for inhalation. The exhaled flow showed different characteristics during each stage of the exhalation process. In the initial phase, a mushroom-shaped flow arose, while some jet characteristics appeared in the middle phase. The effect of thermal buoyancy and thermal plume on the exhaled flow was analyzed. Clear turbulence characteristics were found in the exhaled flow, and the turbulence fluctuation was very strong in the transition stage between exhalation and inhalation. The last finding was that the distribution and value of vorticity were different in each phase. The results of quantitative PIV provided detailed information about the boundary condition set and validation data for CFD simulation.

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“…They found that the gasper played an important role in overall contaminant transmission. Guo et al [13] used an anemometer to obtain high-resolution measurements of turbulence parameters in a jet airflow field induced by a gasper. These measurements provided reliable airflow data, but the method was time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Modeling of gasper-induced jet flow and its impact on cabin air quality

Shi

Chen

You

et al. 2016

Energy and Buildings

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a b s t r a c tGaspers are prevalently installed in aircraft and automobiles to provide supplementary ventilation and improve passengers' thermal comfort. This investigation employed the SST k − ω model to simulate gasper-induced jet flow with the use of detailed gasper geometry, and validated the simulation results using experimental data. The validated CFD results not only revealed the mixing mechanism of a gasper-induced jet with ambient air, but also enabled the development of two mathematical models for characterizing the jet development along the gasper axis and radial velocity profiles in the downstream region. Furthermore, these models enabled the prediction of the entrainment ratio at different locations along a gasper-induced jet, and this ratio was used to evaluate the impact of the jet on air quality in a passenger's breathing zone. The performance of the CFD model and mathematical models was evaluated, and the models were compared on the basis of prediction accuracy and computing time.

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Turbulence measurements of a personal airflow outlet jet in aircraft cabin

Cited by 16 publications

References 41 publications

Evaluating the commercial airliner cabin environment with different air distribution systems

Evaluating the commercial airliner cabin environment with different air distribution systems

TR-PIV measurement of exhaled flow using a breathing thermal manikin

Modeling of gasper-induced jet flow and its impact on cabin air quality

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