Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model
Evaluating aviation emissions and examining the dispersion properties of contaminants are crucial for understanding atmospheric pollution. To assess the pollutant emissions and dispersion of aircraft during the landing and takeoff (LTO) cycle, and address air pollution surrounding the airport result...
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| Language: | English |
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MDPI AG
2024-10-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/15/10/1256 |
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| author | Junli Yang Likun Li Xiaoyu Zheng Hang Liu Fengming Li Yi Xiao |
| author_facet | Junli Yang Likun Li Xiaoyu Zheng Hang Liu Fengming Li Yi Xiao |
| author_sort | Junli Yang |
| collection | DOAJ |
| description | Evaluating aviation emissions and examining the dispersion properties of contaminants are crucial for understanding atmospheric pollution. To assess the pollutant emissions and dispersion of aircraft during the landing and takeoff (LTO) cycle, and address air pollution surrounding the airport resulting from flight operations, this study evaluated emissions throughout the LTO phase based on Quick Access Recorder (QAR) data in conjunction with the first-order approximation method. An improved Gaussian diffusion model for mobile point sources was employed to examine the diffusion characteristics of contaminants. Additionally, CFD calculation outcomes for various exhaust velocities and wind speeds were utilized to validate the trustworthiness of the improved Gaussian model. The discussion also encompasses the influence of diffusion time, wind direction, wind speed, temperature gradient, and particle deposition on the concentration distribution of contaminants. The findings indicated that the Gaussian diffusion model aligned with the results of the CFD calculations. The diffusion distribution of contaminants around airports varies over time and is significantly influenced by atmospheric environmental factors, including wind direction, wind speed, and atmospheric stability. Specifically, a change in wind direction from 0° to 45° caused a shift of approximately 1000 m in the contaminant’s center. An increase in wind speed from 3 m/s to 5 m/s led to a decrease in concentration by about 15%. Furthermore, a transition in atmospheric stability from category ‘a’ (very unstable) to ‘f’ (very stable) resulted in a two-order-of-magnitude increase in contaminant concentrations. |
| format | Article |
| id | doaj-art-90aff53d661749c79c1fb5e28c71a68b |
| institution | OA Journals |
| issn | 2073-4433 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj-art-90aff53d661749c79c1fb5e28c71a68b2025-08-20T02:11:12ZengMDPI AGAtmosphere2073-44332024-10-011510125610.3390/atmos15101256Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion ModelJunli Yang0Likun Li1Xiaoyu Zheng2Hang Liu3Fengming Li4Yi Xiao5School of Flight Technology, Civil Aviation Flight University of China, Guanghan 618307, ChinaSchool of Flight Technology, Civil Aviation Flight University of China, Guanghan 618307, ChinaSchool of Air Traffic Management, Civil Aviation Flight University of China, Guanghan 618307, ChinaSchool of Aviation Engineering, Civil Aviation Flight University of China, Guanghan 618307, ChinaSchool of Flight Technology, Civil Aviation Flight University of China, Guanghan 618307, ChinaSchool of Flight Technology, Civil Aviation Flight University of China, Guanghan 618307, ChinaEvaluating aviation emissions and examining the dispersion properties of contaminants are crucial for understanding atmospheric pollution. To assess the pollutant emissions and dispersion of aircraft during the landing and takeoff (LTO) cycle, and address air pollution surrounding the airport resulting from flight operations, this study evaluated emissions throughout the LTO phase based on Quick Access Recorder (QAR) data in conjunction with the first-order approximation method. An improved Gaussian diffusion model for mobile point sources was employed to examine the diffusion characteristics of contaminants. Additionally, CFD calculation outcomes for various exhaust velocities and wind speeds were utilized to validate the trustworthiness of the improved Gaussian model. The discussion also encompasses the influence of diffusion time, wind direction, wind speed, temperature gradient, and particle deposition on the concentration distribution of contaminants. The findings indicated that the Gaussian diffusion model aligned with the results of the CFD calculations. The diffusion distribution of contaminants around airports varies over time and is significantly influenced by atmospheric environmental factors, including wind direction, wind speed, and atmospheric stability. Specifically, a change in wind direction from 0° to 45° caused a shift of approximately 1000 m in the contaminant’s center. An increase in wind speed from 3 m/s to 5 m/s led to a decrease in concentration by about 15%. Furthermore, a transition in atmospheric stability from category ‘a’ (very unstable) to ‘f’ (very stable) resulted in a two-order-of-magnitude increase in contaminant concentrations.https://www.mdpi.com/2073-4433/15/10/1256LTO cycleimproved gaussian diffusion modelengine emissionStokes’ theoremQAR data |
| spellingShingle | Junli Yang Likun Li Xiaoyu Zheng Hang Liu Fengming Li Yi Xiao Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model Atmosphere LTO cycle improved gaussian diffusion model engine emission Stokes’ theorem QAR data |
| title | Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model |
| title_full | Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model |
| title_fullStr | Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model |
| title_full_unstemmed | Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model |
| title_short | Pollutant Dispersion of Aircraft Exhaust Gas during the Landing and Takeoff Cycle with Improved Gaussian Diffusion Model |
| title_sort | pollutant dispersion of aircraft exhaust gas during the landing and takeoff cycle with improved gaussian diffusion model |
| topic | LTO cycle improved gaussian diffusion model engine emission Stokes’ theorem QAR data |
| url | https://www.mdpi.com/2073-4433/15/10/1256 |
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