Investigation on the particle loss and applicability of aviation nvPM measurement methodology for wide particle size ranges

作     者：Minghua Wang Liuyong Chang Xuehuan Hu Meiyin Zhu Bin Zhang Guangze Li Zheng Xu Minghua Wang;Liuyong Chang;Xuehuan Hu;Meiyin Zhu;Bin Zhang;Guangze Li;Zheng Xu

作者机构：Hangzhou International Innovation InstituteBeihang UniversityHangzhou311115China School of Energy and Power EngineeringBeihang UniversityBeijing100083China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2024年第95卷第12期

页      面：154-165页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：funded by the National Natural Science Foundation of China (grant Nos.52206131 and U2333217) National Key R&D Program of China (grant No.2022YFB2602000) Zhejiang Provincial Natural Science Foundation of China (grant No.LQ22E060004) 

主　　题：Non-volatile particulate matter Thermophoretic loss Transfer loss Particle number concentration Particle size distribution 

摘      要：The precise measurement of non-volatile Particulate Matter(nvPM)is outlined in aviation engine emissions regulations by the International Civil Aviation Organization(ICAO).However,assessing particle losses in the sampling and transfer unit presents challenges,raising concerns about the system s ***,nvPM emissions from small and medium aircraft engines,with thrust not exceeding 26.7 kN,vary widely in size,adding complexity to the measurement *** provide a comprehensive analysis of particle losses in the sampling and transfer subsystems,this study established a test bench equipped with a nanoparticle *** generator simulates nvPM emissions from medium and small aircraft engines and can consistently produce nvPMs with a wide range of concentrations(103–107/cm^(3))and size distributions(20–160 nm).Thermophoretic loss verification experiments were conducted within the sampling pipeline under significant temperature differences,investigating the effects of particle size,temperature gradient,and airflow rate on thermophoretic particle *** experimental results demonstrated good agreement with the predictions of the model proposed by United Technologies Research Centre(UTRC).After correcting for temperature,the experimental data showed a maximum disparity of 2%under typical engine exhaust conditions,validating the predictability of the thermophoretic loss model for various engine ***,verification experiments for particle diffusion and bending losses were *** analysis with the UTRC model revealed nvPM inertial deposition under laminar flow conditions with low Reynolds numbers(Re).As the Re increased,the measured data more closely aligned with the *** losses due to secondary flow patterns ranged from 1%to 10%,depending on particle size and flow *** finding supports the applicability of aviation nvPM measurement methods across a wide particle size *** research provides theoretic