An evaluation of the emission profile for two-wheelers at a traffic junction--颗粒学报PARTICUOLOGY

Agarwal, A. K., Bothra, P., Gupta, T., & Shukla, P. C. (2015). An evaluation of the emission profile for two-wheelers at a traffic junction. Particuology, 18, 112–119. https://doi.org/10.1016/j.partic.2014.01.007

An evaluation of the emission profile for two-wheelers at a traffic junction

Avinash Kumar Agarwal ^a *, Prakhar Bothra ^a, Tarun Gupta ^b, Pravesh Chandra Shukla ^b

a Engine Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
b Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India

10.1016/j.partic.2014.01.007

Volume 18, February 2015, Pages 112-119

Received 27 July 2013, Revised 7 January 2014, Accepted 16 January 2014, Available online 27 May 2014.

E-mail: akag@iitk.ac.in

Highlights

• TPM and BSOF were slightly higher at higher engine speeds.

• Trace element concentration increased with increasing engine speeds.

• Higher capacity engines (>100 cc) emitted higher number of nanoparticles.

• Regulated emissions (CO, NO and HC) increased with increasing engine speed.

• Smoke opacity increased with increased engine speeds.

Abstract

Two-wheeler vehicles are an important mode of transportation in developing countries. However, the emissions from two-wheeler vehicles are significant. Urban two-wheeler vehicles with gasoline-fueled engines produce NO_x and particulate matter emissions that affect urban air quality. During traffic light stops and programmed stops, for instance, pollutants are emitted and are dangerous to human health. In this experimental study, two-wheeler vehicles with different makes, technologies and engine capacities were tested for exhaust emissions including gravimetric and online measurements at different engine speeds and a no load condition at a simulated traffic junction. Gravimetric measurements were performed by collecting the particulate mass (at two engine speeds: 1500 and 2500 rpm) from a diluted engine-out exhaust on quartz filter paper. Next, these collected particulates were used to determine the presence of metals, as well as the benzene soluble organic fraction (BSOF). The total particulate mass, BSOF and trace elements were slightly higher at a higher engine speed (2500 rpm). Online measurements were performed by sampling the engine exhaust (at four engine speeds: 1500, 2000, 2500, and 3000 rpm) and using online instruments to determine the particle number and size distribution, the particle-bound polyaromatic hydrocarbons (PAHs), the gaseous emissions and the smoke opacity. Engines with higher cubic capacity emitted a higher concentration of nano-particles. The particle-bound PAH concentration increased as the engine speed increased, but this concentration was notably low for the highest engine speed tested (3000 rpm). The regulated gaseous emissions increased as the engine speed increased for all vehicles.

Graphical abstract

Keywords

Benzene soluble organic fraction (BSOF); Particle number and size distribution; Trace elements; Polyaromatic hydrocarbons (PAHs); Regulated gaseous emissions

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