为解决中国民用航空发动机测试数据处理方式中的技术难点,使符合飞机发动机排气污染物的适航审定标准,参考国际民航组织(ICAO)颁布的“飞机发动机排放”条例采集污染物气体样本数据。基于ICAO标准的起飞着陆(LTO)循环概念,采用ICAO计算方法和美国车辆工程师协会(SAE)航空建议操作规程(ARP)计算方法得出航空发动机NO_x排放指数。根据中国民航规章34部(CCAR-34),验证得出航空发动机JT3D-7的NO_x排放符合现行的适航标准。

With the growing awareness of the importance of the environmental protection, a certification for nitrogen oxide emission becomes more and more stringent. The certification of airworthiness is necessary before the aircraft enters into a commercial operation. The requirement of the airworthiness is the basic regulation guarantee for the aircraft safe flight, so it is necessary to study the airworthiness certification method for gas turbine engine emissions. In order to solve the technical difficulty in dealing with the gas turbine engine emission test data, to meet the requirement in the airworthiness certification standard for engine emissions, the "Aircraft Engine Emissions" promulgated by the convention of International Civil Aviation Organization (ICAO), is used to compile the pollutant gas sample data. The calculation of NO_x emission index from aircraft is carried out by using Aerospace Recommended Practice (ARP) of Society of Automotive Engineers (SAE) and the ICAO method based on the ICAO standard LTO cycle. JT3D-7 NO_x emissions are compatible with the existing regulatory standards according to China Civil Aviation Regulations (CCAR-34).