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Impact of combustion chamber geometry on charge stratification in a CNG fueled direct injection Otto engine

Technical Report:

Abstract

The modest objective of the Stratified Charge (SC) system presented in this report is to solve the problem with emissions of nitrogen oxide and particulate from diesel engines without sacrificing the good fuel economy. In theory it should be possible to reach this goal as the emission levels are not related to the efficiency of this engine type. The suggested solution is based on a combustion chamber design and an injection system that makes it possible to better control the stratification process. The fuel, in this case natural gas, is deposited in a restricted and load dependent volume of the conically shaped combustion chamber by a long fuel injection tube. At the beginning of the project the question whether or not the injection tube would survive in this environment had the highest priority. Hence a theoretical analysis of the heat loads on the tube was initiated. The results from the tests clearly indicate that the stratification process can be controlled by the geometry of the combustion in combination with the fuel injection system. The new system makes it possible to limit the fuel diffusion and maintain a richer mixture in a predetermined part of the combustion chamber. Thus the emissions  More>>
Authors:
Publication Date:
Dec 01, 1994
Product Type:
Technical Report
Report Number:
LUTMDN-TMVK-7016
Reference Number:
SCA: 330102; PA: SWD-95:007038; EDB-95:029082; SN: 95001320525
Resource Relation:
Other Information: PBD: Dec 1994
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL ENGINES; AIR POLLUTION ABATEMENT; OTTO CYCLE; SPARK IGNITION ENGINES; COMBUSTION CHAMBERS; STRATIFIED CHARGE ENGINES; NATURAL GAS; 330102; DIESEL
OSTI ID:
10114436
Research Organizations:
Lund Univ. (Sweden). Dept. of Heat and Power Engineering
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0282-1990; Other: ON: DE95737683; TRN: SE9507038
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
179 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Egnell, R. Impact of combustion chamber geometry on charge stratification in a CNG fueled direct injection Otto engine. Sweden: N. p., 1994. Web.
Egnell, R. Impact of combustion chamber geometry on charge stratification in a CNG fueled direct injection Otto engine. Sweden.
Egnell, R. 1994. "Impact of combustion chamber geometry on charge stratification in a CNG fueled direct injection Otto engine." Sweden.
@misc{etde_10114436,
title = {Impact of combustion chamber geometry on charge stratification in a CNG fueled direct injection Otto engine}
author = {Egnell, R}
abstractNote = {The modest objective of the Stratified Charge (SC) system presented in this report is to solve the problem with emissions of nitrogen oxide and particulate from diesel engines without sacrificing the good fuel economy. In theory it should be possible to reach this goal as the emission levels are not related to the efficiency of this engine type. The suggested solution is based on a combustion chamber design and an injection system that makes it possible to better control the stratification process. The fuel, in this case natural gas, is deposited in a restricted and load dependent volume of the conically shaped combustion chamber by a long fuel injection tube. At the beginning of the project the question whether or not the injection tube would survive in this environment had the highest priority. Hence a theoretical analysis of the heat loads on the tube was initiated. The results from the tests clearly indicate that the stratification process can be controlled by the geometry of the combustion in combination with the fuel injection system. The new system makes it possible to limit the fuel diffusion and maintain a richer mixture in a predetermined part of the combustion chamber. Thus the emissions of unburned fuel can be reduced if compared with a SC system with a conventional combustion chamber. However, in the present SC system it is not possible to control the air/fuel ratio distribution within the mixture. Emission data indicates the combustion of the fuel charge takes place at different conditions giving high emissions of soot, nitrogen oxide and unburned fuel at the same time. In order to continue the development work of the new SC system the combustion chamber must be optically accessible to make visual studies and laser based measurements possible. 33 refs., 156 figs}
place = {Sweden}
year = {1994}
month = {Dec}
}