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The effect of valve strategy on in-cylinder flow and combustion

Abstract

This paper examines the effects of different valve strategies and their effect on in-cylinder flow and combustion. A conventional four valve per cylinder otto engine was modified to enable optical access. The flow measurements were made with a two-component laser Doppler velocimetry system. The combustion was monitored by running pressure data from a pressure transducer through a one-zone heat release model. The results show that when the valves operate normally a barrel flow is present and when one valve is closed a swirling flow occurs. No increase in turbulence was found with later phasing, except in the case of very late inlet valve opening and port deactivation. This resulted in a jet with high turbulence, making the combustion fast and stable, even with a very lean mixture ({lambda}=1.8). 6 refs, 44 figs, 4 tabs
Authors:
Publication Date:
Jan 01, 1997
Product Type:
Technical Report
Report Number:
LUTMDN-TMVK-5280
Reference Number:
SCA: 330101; PA: SWD-97:007296; EDB-97:061632; NTS-97:010257; SN: 97001773964
Resource Relation:
Other Information: DN: Examination paper; PBD: Jan 1997
Subject:
33 ADVANCED PROPULSION SYSTEMS; VALVES; SPARK IGNITION ENGINES; AIR FLOW; CYLINDERS; COMBUSTION CHAMBERS; TURBULENCE; VELOCITY; NATURAL GAS; EXPERIMENTAL DATA
OSTI ID:
464362
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: DE97740812; TRN: SE9707296
Availability:
OSTI as DE97740812
Submitting Site:
SWD
Size:
34 p.
Announcement Date:
May 13, 1997

Citation Formats

Soederberg, F. The effect of valve strategy on in-cylinder flow and combustion. Sweden: N. p., 1997. Web.
Soederberg, F. The effect of valve strategy on in-cylinder flow and combustion. Sweden.
Soederberg, F. 1997. "The effect of valve strategy on in-cylinder flow and combustion." Sweden.
@misc{etde_464362,
title = {The effect of valve strategy on in-cylinder flow and combustion}
author = {Soederberg, F}
abstractNote = {This paper examines the effects of different valve strategies and their effect on in-cylinder flow and combustion. A conventional four valve per cylinder otto engine was modified to enable optical access. The flow measurements were made with a two-component laser Doppler velocimetry system. The combustion was monitored by running pressure data from a pressure transducer through a one-zone heat release model. The results show that when the valves operate normally a barrel flow is present and when one valve is closed a swirling flow occurs. No increase in turbulence was found with later phasing, except in the case of very late inlet valve opening and port deactivation. This resulted in a jet with high turbulence, making the combustion fast and stable, even with a very lean mixture ({lambda}=1.8). 6 refs, 44 figs, 4 tabs}
place = {Sweden}
year = {1997}
month = {Jan}
}