Athens International Airport "Eleftherios Venizelos" (AIA) is considered a pioneer international Public-Private Partnership, being the first major int. airport constructed with the participation of the private sec...Athens International Airport "Eleftherios Venizelos" (AIA) is considered a pioneer international Public-Private Partnership, being the first major int. airport constructed with the participation of the private sector with the BOOT method (Build, Own, Operate, and Transfer). AIA's 1st day of operation was in March 2001 and the aircraft traffic on 2006 reached 191.000 movements & 15.1 million passengers. According to the European Directive 49/2002 and the Joint Ministerial Decision 13586/724-28/3/06, Athens International Airport (AIA) is included in the category of"large airports" and it consequently comes under the authority of the above mentioned legislation on the evaluation and management of environmental noise. A complete Study on Aircraft Noise [1], according to the European Directive 49/2002 [2] and Joint Ministerial Decision 13586/724-28/3/06 was undertaken under the auspices of the Ministry of Environment, Energy & Climate Change, the Hellenic Civil Aviation Authority, and AIA S.A. In this article the following results are presented: (1) The 2006 Strategic Noise Map (SNM) of both indicators Lden and Lnight based on the ECAC.CEAC Doc 29 methodology "Report on Standard Method of Computing Noise Contours around Civil Airports", 1997 [3], (2) A statistical analysis of predicted vs measured noise levels based on the existing Noise Monitoring System, (3) Effects from the removal of marginally accepted chapter 3 aircraft, (4) A complete evaluation of results regarding calculation of area/land uses and number of individuals living in residences inside blocks exposed in various levels of noise, and (5) A full evaluation of Noise Action Plans (NAP) regrouping existing and foreseen actions FOR 2006 & 2011 scenarios, especially regarding among others, noise abatement procedures, a comprehensive noise insulation legal framework.展开更多
When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow os- cillation occurs. This oscillation depends on the pressure ratio in the flowfield, the position of an obs...When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow os- cillation occurs. This oscillation depends on the pressure ratio in the flowfield, the position of an obstacle and is related with the noise problems of aeronautical and other industrial engineering. The characteristic and the mechanism of self-induced flow oscillation, have to be clarified to control various noise problems. But, it seems that the characteristics of the oscillated flowfield and the mechanism of an oscillation have to be more cleared to control the oscillation. This paper aims to clarify the effect of the pressure ratio and the obstacle position and the mechanism of self-induced flow oscillation by numerical analysis and experiment, when the underexpanded su- personic jet impinges on the cylindrical body. From the result of this study, it is clear that occurrence of the self-induced flow osciUation depends on the pressure balance in the flowfield.展开更多
文摘Athens International Airport "Eleftherios Venizelos" (AIA) is considered a pioneer international Public-Private Partnership, being the first major int. airport constructed with the participation of the private sector with the BOOT method (Build, Own, Operate, and Transfer). AIA's 1st day of operation was in March 2001 and the aircraft traffic on 2006 reached 191.000 movements & 15.1 million passengers. According to the European Directive 49/2002 and the Joint Ministerial Decision 13586/724-28/3/06, Athens International Airport (AIA) is included in the category of"large airports" and it consequently comes under the authority of the above mentioned legislation on the evaluation and management of environmental noise. A complete Study on Aircraft Noise [1], according to the European Directive 49/2002 [2] and Joint Ministerial Decision 13586/724-28/3/06 was undertaken under the auspices of the Ministry of Environment, Energy & Climate Change, the Hellenic Civil Aviation Authority, and AIA S.A. In this article the following results are presented: (1) The 2006 Strategic Noise Map (SNM) of both indicators Lden and Lnight based on the ECAC.CEAC Doc 29 methodology "Report on Standard Method of Computing Noise Contours around Civil Airports", 1997 [3], (2) A statistical analysis of predicted vs measured noise levels based on the existing Noise Monitoring System, (3) Effects from the removal of marginally accepted chapter 3 aircraft, (4) A complete evaluation of results regarding calculation of area/land uses and number of individuals living in residences inside blocks exposed in various levels of noise, and (5) A full evaluation of Noise Action Plans (NAP) regrouping existing and foreseen actions FOR 2006 & 2011 scenarios, especially regarding among others, noise abatement procedures, a comprehensive noise insulation legal framework.
文摘When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow os- cillation occurs. This oscillation depends on the pressure ratio in the flowfield, the position of an obstacle and is related with the noise problems of aeronautical and other industrial engineering. The characteristic and the mechanism of self-induced flow oscillation, have to be clarified to control various noise problems. But, it seems that the characteristics of the oscillated flowfield and the mechanism of an oscillation have to be more cleared to control the oscillation. This paper aims to clarify the effect of the pressure ratio and the obstacle position and the mechanism of self-induced flow oscillation by numerical analysis and experiment, when the underexpanded su- personic jet impinges on the cylindrical body. From the result of this study, it is clear that occurrence of the self-induced flow osciUation depends on the pressure balance in the flowfield.