Investigating the impact of gaspers on cabin air quality in commercial airliners with a hybrid turbulence model

You, Ruoyu; Lin, Chao–Hsin; Wei, Daniel; Chen, Qingyan

doi:10.1016/j.buildenv.2016.10.018

Cited by 35 publications

(25 citation statements)

References 19 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study assumed a fully occupied condition, and the same number of passengers and crew members on all the flights. The cabin volume was estimated from data on several airplane cabin mock‐ups used in previous CFD simulations . After the passengers deplaned, ground services such as catering and cleaning were conducted inside the aircraft cabin in preparation for the next flight.…”

Section: Resultsmentioning

confidence: 99%

Prediction of particle deposition around the cabin air supply nozzles of commercial airplanes using measured in-cabin particle emission rates

et al. 2018

Self Cite

View full text Add to dashboard Cite

Enhanced soiling on the surfaces around air supply nozzles due to particle deposition is frequently observed in commercial airliners. The problem is worsened by severe outdoor air pollution and flight delays in China. The particles in an aircraft cabin originate from both outdoor and in-cabin sources. This study conducted measurements on multiple commercial flights to obtain particle emission rates from in-cabin sources. Additional experiments on a retired MD-82 airplane provided justification of the in-flight measurements. The in-cabin sources emitted more particles during boarding/deplaning than during meal servicing and sitting. The average PM2.5 emission rates were 7.2, 2.6, 1.9, and 1.8 (μg/min per person), respectively, during the boarding/deplaning, sitting on the ground, sitting in the air, and meal servicing. The corresponding PM10 emission rates were 15.4, 6.1, 5.3, and 5.4 (μg/min per person), respectively, for these four periods. The average particle emission rate from in-cabin sources varied seasonally and was the highest in winter. With the measured data, this investigation used a CFD model to predict the accumulation of particles deposited around the nozzles of an airplane, taking into account the flight routes and the outdoor particle concentrations at the airports where the airplanes were parked. For the most polluted airplane in China, the dirty spots/areas around the nozzles inside the airplane became visible after 6 months. The method proposed in this study can be used for any commercial airplane to predict the accumulation of particles deposited around the air supply nozzles.

show abstract

Section: Resultsmentioning

confidence: 99%

Prediction of particle deposition around the cabin air supply nozzles of commercial airplanes using measured in-cabin particle emission rates

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because of the approximations used in CFD, it was necessary to validate the computer simulations with the experimental data obtained in the previous section before the software program could be used for ventilation system optimization. We used a hybrid turbulence model proposed by You et al [11] to calculate the air distribution in airliner cabins. Among all Reynolds-averaged Navier-Stokes (RANS) models, the RNG k-ε model is the most robust in calculating the bulk air regions for enclosed environments [16][17][18][19], and the SST k-ω model is superior in the near-wall regions [11].…”

Section: Computer Simulationsmentioning

confidence: 99%

“…We used a hybrid turbulence model proposed by You et al [11] to calculate the air distribution in airliner cabins. Among all Reynolds-averaged Navier-Stokes (RANS) models, the RNG k-ε model is the most robust in calculating the bulk air regions for enclosed environments [16][17][18][19], and the SST k-ω model is superior in the near-wall regions [11]. To take advantage of both models, this hybrid model uses the standard k-ω model in the near-wall region and a transformed RNG k-ε model in the bulk air region.…”

Section: Computer Simulationsmentioning

confidence: 99%

“…They found that the CO 2 concentration with the mixing air distribution was fairly uniform, and the mixing air distribution system could spread infectious diseases. You et al [10,11] developed a consolidated turbulence model and a simplified gasper geometry model in a CFD program for predicting the airflow and contaminant transport in a cabin with gaspers. The CFD program was then used to investigate the impact of the gaspers on contaminant transport in the economy-class cabins of Boeing 767 and 737 airliner.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An innovative personalized displacement ventilation system for airliner cabins

You

Zhang

Zhao

et al. 2018

Building and Environment

Self Cite

View full text Add to dashboard Cite

A B S T R A C TIn airliner cabins, mixing ventilation systems with gaspers are not efficient in controlling contaminant transport. To improve the cabin environment, this investigation proposed an innovative ventilation system that would reduce contaminant transport and maintain thermal comfort. We manufactured and installed the proposed ventilation system in an occupied seven-row, single-aisle aircraft cabin mockup. Air velocity, air temperature, and contaminant distribution in the cabin mockup were obtained by experimental measurements. The investigation used the experimental data to validate the results of CFD simulation. The validated CFD program was then used to study the impact of the locations and number of exhausts on contaminant removal and thermal comfort in a one-row section of a fully occupied Boeing-737 cabin. Although the diffusers in the proposed system were close to the passengers' legs, the air velocity magnitude was acceptable in the lower part of the cabin and the leg area. The proposed system provided an acceptable thermal environment in the cabin, although passengers could feel cold when placing their legs directly in front of the diffusers. The four-exhaust configuration of the new ventilation system was the best, and it decreased the average exposure in the cabin by 57% and 53%, respectively, when compared with the mixing and displacement ventilation systems.

show abstract

“…It is undoubtedly that the Eulerianbased approach can provide very fast 3D predictions of the contaminants concentration distribution, which is an important parameter when assessing the health risks because passengers sitting inside the high-concentration regions would usually have higher health risks. A most recent study conducted by You et al [21] employed the aforementioned Wells-Riley equation in conjunction with the Eulerian model to investigate the effect of the gaspers on the passengers' exposure risks in a half-row cabin section. The Wells-Riley method was combined with the two-phase flow model when assessing the exposure risks in the cabin environment.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of airborne disease infection risks in an airliner cabin using the Lagrangian-based Wells-Riley approach

Yan

Shang

et al. 2017

Building and Environment

View full text Add to dashboard Cite

a b s t r a c tAn urgent demand of assessing passengers' exposure risks in airliner cabins was raised as commercial airliners are one of the major media that carrying and transmitting infectious disease worldwide. In this study, simulations were conducted using a Boeing 737 cabin model to study the transport characteristics of airborne droplets and the associated infection risks of passengers. The numerical results of the airflow field were firstly compared against the experimental data in the literature to validate the reliability of the simulations. Airborne droplets were assumed to be released by passengers through coughing and their transport characteristics were modelled using the Lagrangian approach. Numerical results found that the particle travel distance was very sensitive to the release locations, and the impact was more significant along the longitudinal and horizontal directions. Particles released by passengers sitting next to the windows could travel much further than the others. A quantifiable approach was then applied to assess the individual infection risks of passengers. The key particle transport information such as the particle residence time yielded from the Lagrangian tracking process was extracted and integrated into the Wells-Riley equation to estimate the risks of infection. Compared to the Eulerian-based approach, the Lagrangian-based approach presented in this study is more robust as it addresses both the particle concentration and particle residence time in the breathing zone of every individual passenger.

show abstract

Investigating the impact of gaspers on cabin air quality in commercial airliners with a hybrid turbulence model

Cited by 35 publications

References 19 publications

Prediction of particle deposition around the cabin air supply nozzles of commercial airplanes using measured in-cabin particle emission rates

Prediction of particle deposition around the cabin air supply nozzles of commercial airplanes using measured in-cabin particle emission rates

An innovative personalized displacement ventilation system for airliner cabins

Evaluation of airborne disease infection risks in an airliner cabin using the Lagrangian-based Wells-Riley approach

Contact Info

Product

Resources

About