Calibration and Experimental Study of a Self-Developed Particle-Number Measurement Instrument

Author:

Li Guangze123ORCID,Luo Weixian2,Zhang Chenglin123,Cui Boxuan2,Chang Liuyong123ORCID,Chen Longfei13

Affiliation:

1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China

2. Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, China

3. Zhongfa Aviation Institute, Beihang University, Hangzhou 311115, China

Abstract

To accurately evaluate the size and distribution characteristics of the emission particles exhausted from in-use motor vehicle engines, we independently developed a condensation particle counter (CPC) known as BHCPC. It was calibrated by conducting the calibration procedures stated in the International Standard ISO 27981. After calibration, we conducted on-site measurements and offline sampling analysis of soot particles exhausted from different engines at a motor vehicle inspection center. The calibration results show that the detection efficiency is 90% when the particle diameter is 20.6 nm and the startup response time of the instrument is 3.53 s. The experiment results show that the self-developed BHCPC demonstrates good consistency in measuring particle-number concentration (PNC) in motor vehicle exhaust, with significant count fluctuations only occurring when PNC is higher than 25,000 P/cc. Under idle conditions, motor vehicles compliant with China VI emission regulations exhibit markedly lower exhaust emission PNC compared to those adhering to China IV emission regulations. Moreover, the results obtained from the offline electron microscope analysis show that fuel content in particle samples significantly decreases as engine speed increases, and a similar variation was also found in particle size. The micro-characteristics of the particle can give potential support to the combustion diagnostics.

Funder

National Natural Science Foundations of China

National Key Research and Development Project of China

Publisher

MDPI AG

Subject

Process Chemistry and Technology,Chemical Engineering (miscellaneous),Bioengineering

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