This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Sources of Hydrocarbon Emissions from a Small Direct Injection Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
The purpose of this paper is to clarify the mechanisms of unburnt hydrocarbon (HC) emissions from a small direct - injection (DI) diesel engine. HC emission levels of small DI diesel engines are considerably higher than those of corresponding indirect - injection (IDI) diesel engines, even when sacless injection nozzles that are effective in reducing HC emissions are installed on them.
In this study, analytical engine tests were performed to evaluate the relative significance of various potential sources of HC emissions from a small DI diesel engine equipped with sacless type injectors. The results suggest the major sources of HC emissions to be 1) over - lean mixture formation beyond the lean limit of combustion during the ignition delay period, 2) spray impingement on the combustion chamber wall, the phenomenon of which may be closely related to the spray induction length, 3) spray droplets of relative larger size due to poor spray atomization in the final injection stage, and 4) flame quenching or incomplete combustion in the narrow clearance between the piston top and the cylinder head.
Topic
Citation
Matsui, Y. and Sugihara, K., "Sources of Hydrocarbon Emissions from a Small Direct Injection Diesel Engine," SAE Technical Paper 871613, 1987, https://doi.org/10.4271/871613.Also In
References
- Greeves, G. Khan, I. M. “Origins of Hydrocarbon Emissions from Diesel Engines,” SAE Paper 770259
- Sugihara, K. et al. “Potentiality of Small DI Diesel Engines Under Consideration of Emissions and Noise Control,” SAE Paper 851213 1985
- Sato, T. et al. Proc. Japan Soc. Mech. Engrs. 780-16 1978-10 45
- Hiroyasu, H. Arai, M. Trans. Japan JSAE 21 1980 5
- Yu, R. C. et al. “Sources of Hydrocarbon Emissions from Direct Injection Diesel Engines,” SAE Paper 800048 1980
- Alkidas, A. C. “Hydrocarbon Emissions from a Single - Cylinder, Divided - Chamber Diesel Engine,” SAE Paper 841380 1984