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Assessing the inter-annual variability of separation distances around odour sources to protect the residents from odour annoyance

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Journal of Environmental Sciences 2019年第5期31卷 11-24页

作者： Marlon Brancher Martin Piringer Davide Franco Paulo Belli Filho Henrique De Melo Lisboa Gunther Schauberger Postgraduate Program in Environmental Engineering (PPGEA) Federal University of Santa Catarina (UFSC) 88040900 Florianopolis Brazil.CAPES Foundation scholarship holder (main author) Brazilian Ministry of Education Brasilia Brazil WG Environmental Health Department of Biomedical Sciences University of Veterinary Medicine ViennaVeterinarplatz1 A-1210Vienna Austria Central Institute for Meteorology and Geodynamics Hohe Warte 38 A-1190 Vienna Austria

In recent years, there has been a growing concern about potential impacts on public health and wellbeing due to exposure to environmental odour. separation distances between odour-emitting sources and residential areas can be calculated using dispersion models, as a means of protecting the neighbourhood from odour annoyance. This study investigates the suitability of using one single year of meteorological input data to calculate reliable direction-dependent separation distances. Accordingly, we assessed and quantified the inter-annual variability of separation distances at two sites with different meteorological conditions, one in Brazil and the other in Austria. A 5-year dataset of hourly meteorological observations was used for each site. Two odour impact criteria set in current regulations were selected to explore their effect on the separation distances. The coefficient of variation was used as a statistical measure to characterise the amount of annual variation. Overall,for all scenarios, the separation distances had a low degree of inter-annual variability(mean coefficient of variation values from 8% to 21%). Reasonable agreements from year to year were therefore observed at the two sites under investigation, showing that one year of meteorological data is a good compromise to achieve reliable accuracy. This finding can provide a more cost-effective solution to calculate separation distances in the vicinity of odour sources.

关键词： Environmental odour Odour annoyance Impact assessment Dispersion modelling Regulatory criteria separation distance

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Structure and Combustion Characteristics of Methane/Air Premixed Flame under the Action of Wall

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Energy Engineering 2021年第4期118卷 1135-1154页

作者： Feiyang Li Jianfeng Pan Chenxin Zhang Evans K.Quaye Xia Shao School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China

In order to obtain the combustion characteristics of the CH4/Air premixed flame under the action of the wall interaction,a study on the impact of the jet flame on the wall at different separation distances was carried *** separation distance from the burner outlet to the lower surface of the wall is changed and the flame structure is obtained through *** temperature,velocity and reaction rate are obtained through numerical simulation,and the law of flame characteristics change is obtained through *** results show that as the separation distance increases,the premixing cone inside the flame gradually changes from a horn shape to a complete cone shape and the length of the premixing cone profile ***,the peak temperature and velocity of the mixture in the axial direction gradually increase,and the temperature and velocity in the radial direction first increase and then *** temperature gradient and velocity reach the maximum when the separation distance is 11 *** peaks of reactants(CH_(4))net reaction rate intermediate products(CO)and products(CO_(2),H_(2)O)on the axis and the axial distance corresponding to the peaks increase *** chemical reaction rate near the wall also gradually decreases with the increase of the separation distance.

关键词： Flame-wall interaction separation distance flame structure air flow temperature flow velocity reaction rate

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Overview of development and regulatory aspects of high altitude platform system

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Intelligent and Converged Networks 2020年第1期1卷 58-78页

作者： Dong Zhou Sheng Gao Ruiqi Liu Feifei Gao Mohsen Guizani ZTE Corporation Shenzhen 518057China. Department of Automation Tsinghua UniversityBeijing 100084China CSE Department Qatar UniversityDoha 2713Qatar

High Altitude Platform(HAP)systems comprise airborne base stations deployed above 20 km and below 50 km to provide wireless access to devices in large *** this paper,two types of applications using HAP systems:one with HAP Station(HAPS)and the other with HAPS as International Mobile Telecommunication(IMT)Base Station(HIBS)are *** HAP system with HAPS has already received wide recognition from the academia and the industry and is considered as an effective solution to provide internet access between fixed points in suburban and rural areas as well as *** systems with HIBS to serve IMT user terminal have just started to draw attention from *** HIBS application is expected to be an anticipate mobile service application complementing the IMT requirement for cell phone or other mobile user terminals in which the service field of HAPS application cannot *** describing and characterizing the two types of systems,coexistence studies and simulation results using both the Power Fluxed Density(PFD)mask and separation distance based methods are presented in this *** paper also predicts future trends of the evolution paths for the HAP systems along with challenges and possible solutions from the standpoint of system architectures and spectrum regulation.

关键词： High Altitude Platform(HAP)system HAP Station(HAPS) International Mobile Telecommunication(IMT) HAPS as IMT Base Station(HIBS) Power Fluxed Density(PFD)mask separation distance

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