An experimental analysis of the turbulent structures generated by the intake port of a DISI-engine

An experimental analysis of the turbulent structures generated by the intake port of a DISI-engine An essential task in the optimization of combustion processes for DISI (Direct Injection Spark Ignition) engines is the generation of a suitable in-cylinder flow, leading to easy ignition conditions and low pollutant emissions. Therefore, the determination of the transient flow behaviour generated in the cylinder by the intake port and the identification of the origin of flow fluctuations are equally important. A better insight into the time-dependent behaviour of in-cylinder flow is necessary to avoid unwanted flow variations and enhance the fuel-mixture preparation. Suitable information is provided here by the experimental measurement of instantaneous flow fields in a model cylinder flow, as obtained from High Speed Particle Image Velocimetry. The investigated flow fields are generated by a four-valve DISI production engine cylinder head on a steady-state test-bed. The present paper presents a procedure based on Singular Value Decomposition (SVD) in order to filter out measurement errors and to obtain information about the transient behaviour of in-cylinder flows. First, the procedure is presented and analyzed by considering generic vector fields, demonstrating that information concerning the transient behaviour is detectable in this manner. Next, the transient behaviour of the in-cylinder flow is investigated by reconstructing flow fields with the SVD procedure. The reconstruction employs a specified number of SVD spatial modes φ i (x) and corresponding SVD time coefficients a Di (t), which are reduced to their deterministic parts. Afterwards, the reduced SVD time coefficients a Di (t) are used to determine the main fluctuation frequencies of the in-cylinder flow and to identify the origin of these fluctuations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

An experimental analysis of the turbulent structures generated by the intake port of a DISI-engine

Loading next page...
 
/lp/springer_journal/an-experimental-analysis-of-the-turbulent-structures-generated-by-the-W2Veng1S8f
Publisher
Springer-Verlag
Copyright
Copyright © 2009 by Springer-Verlag
Subject
Engineering; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-009-0736-0
Publisher site
See Article on Publisher Site

Abstract

An essential task in the optimization of combustion processes for DISI (Direct Injection Spark Ignition) engines is the generation of a suitable in-cylinder flow, leading to easy ignition conditions and low pollutant emissions. Therefore, the determination of the transient flow behaviour generated in the cylinder by the intake port and the identification of the origin of flow fluctuations are equally important. A better insight into the time-dependent behaviour of in-cylinder flow is necessary to avoid unwanted flow variations and enhance the fuel-mixture preparation. Suitable information is provided here by the experimental measurement of instantaneous flow fields in a model cylinder flow, as obtained from High Speed Particle Image Velocimetry. The investigated flow fields are generated by a four-valve DISI production engine cylinder head on a steady-state test-bed. The present paper presents a procedure based on Singular Value Decomposition (SVD) in order to filter out measurement errors and to obtain information about the transient behaviour of in-cylinder flows. First, the procedure is presented and analyzed by considering generic vector fields, demonstrating that information concerning the transient behaviour is detectable in this manner. Next, the transient behaviour of the in-cylinder flow is investigated by reconstructing flow fields with the SVD procedure. The reconstruction employs a specified number of SVD spatial modes φ i (x) and corresponding SVD time coefficients a Di (t), which are reduced to their deterministic parts. Afterwards, the reduced SVD time coefficients a Di (t) are used to determine the main fluctuation frequencies of the in-cylinder flow and to identify the origin of these fluctuations.

Journal

Experiments in FluidsSpringer Journals

Published: Sep 16, 2009

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off