Abstract The International Civil Aviation Organization has established new regulatory standards for emissions certification of non-volatile particulate matter (nvPM) from aircraft turbine engines. The adoption of the nvPM emissions regulatory standards required development of a standardized sampling and measurement methodology, and rigorous testing. Three reference systems for aircraft engine nvPM emissions measurement, compliant with the specifications for the standardized methodology, were independently developed. This paper reports the results of the first inter-comparison of these three reference systems using a CFM56-7B26/3 aircraft engine to establish repeatability and intermediate precision of the sampling and measurement systems as part of the multi-agency international collaborative projects: Aviation-Particle Regulatory Instrumentation Demonstration Experiment (A-PRIDE) 5/Studying, sAmpling and Measuring of aircraft ParticuLate Emissions (SAMPLE) III - SC03. The instruments used in the three reference systems recorded nvPM mass and number concentration, which were converted to their respective emission indices for comparison. The reference systems generally agreed to within 15% of the average nvPM number emission index and 30% of the average nvPM mass emission index. The only exception was for the nvPM mass instruments, which exhibited a higher variation as the concentration levels approached the limit of detection. The additional measured particle size distributions could be approximated to lognormal distributions with the geometric mean diameter ranging from 15 nm to 38 nm, and the geometric standard deviation varying between 1.53 and 1.92. The results from this study are a benchmark for the variability in standardized sampling and measurement systems for measuring aircraft engine nvPM emissions.

中文翻译：

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航空发动机非挥发性颗粒物排放标准化采样和测量参考系统的比较

摘要 国际民航组织针对飞机涡轮发动机的非挥发性颗粒物 (nvPM) 的排放认证制定了新的监管标准。非挥发性微粒物质排放监管标准的采用需要开发标准化的采样和测量方法以及严格的测试。独立开发了三个用于飞机发动机 nvPM 排放测量的参考系统，符合标准化方法的规范。作为多机构国际合作项目的一部分，本文报告了使用 CFM56-7B26/3 飞机发动机对这三个参考系统进行首次比对的结果，以建立采样和测量系统的重复性和中间精度：航空粒子管制仪器演示实验 (A-PRIDE) 5/飞机微粒排放的研究、采样和测量 (SAMPLE) III - SC03。三个参考系统中使用的仪器记录了 nvPM 质量和数量浓度，并将其转换为各自的排放指数以进行比较。参考系统普遍同意在平均 nvPM 数量排放指数的 15% 和平均 nvPM 质量排放指数的 30% 以内。唯一的例外是 nvPM 质谱仪，当浓度水平接近检测限时，它表现出更高的变化。额外测量的粒度分布可近似为几何平均直径范围为 15 nm 至 38 nm 且几何标准偏差在 1 之间变化的对数正态分布。53 和 1.92。这项研究的结果是用于测量飞机发动机 nvPM 排放的标准化采样和测量系统可变性的基准。