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TRANSIENT EGR IN A LONG-ROUTE AND SHORT-ROUTE EGR-SYSTEM
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
2009 (English)In: PROCEEDINGS OF THE 2009 SPRING TECHNICAL CONFERENCE OF THE ASME INTERNAL COMBUSTION ENGINE DIVISION, NEW YORK: AMER SOC MECHANICAL ENGINEERS , 2009, 761-770 p.Conference paper, Published paper (Refereed)
Abstract [en]

The use of EGR to lower NOx-emissions from Diesel engines is a well-documented method. Recently, more and more research is done on alternative EGR routing systems such as long-route EGR. To reach future emission legislation goals it is not sufficient to focus on steady-state driving. The emission peaks during the transient parts of driving cycles are gaining importance. It is therefore interesting to analyze the EGR-flow in transients for different configurations of the EGR system. In this work, a 1-D simulation is performed in GT-Power for a Euro 4 passenger car diesel engine equipped with cooled short-route EGR and a variable geometry turbine. For calibration of the simulation, load transients were measured including the measurement of transient EGR-rates using a fast CO2-analyzer and cylinder pressure to obtain heat-release data. While the transient heat-release rates are used as an input for the combustion-simulation, the EGR response measurements are used as a reference for calibration of the EGR-system and its components. A long route EGR system and a short-route EGR system are then simulated and compared, focusing on transient response, availability of EGR during the transient and the fuel consumption in steady state. It is shown that the long-route system has advantages in both steady-state and transient driving conditions. In steady state it can decrease fuel consumption, in transient it can provide EGR without negative effect on the transient response.

Place, publisher, year, edition, pages
NEW YORK: AMER SOC MECHANICAL ENGINEERS , 2009. 761-770 p.
National Category
Computer and Information Science
Identifiers
URN: urn:nbn:se:kth:diva-30229DOI: 10.1115/ICES2009-76107ISI: 000273471300073Scopus ID: 2-s2.0-77952868412OAI: oai:DiVA.org:kth-30229DiVA: diva2:399005
Conference
Spring Technical Conference of the ASME-Internal-Combustion-Engine-Division Milwaukee, WI, MAY 03-06, 2009
Note
QC 20110221Available from: 2011-02-21 Created: 2011-02-21 Last updated: 2014-02-03Bibliographically approved
In thesis
1. Efficiency and Mixing Analysis of EGR-Systems for Diesel Engines
Open this publication in new window or tab >>Efficiency and Mixing Analysis of EGR-Systems for Diesel Engines
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The reduction of fuel consumption and the reduction of toxic emissions are the main goals of research and development in the area of internal combustion engines. The use of exhaust gas recirculation (EGR) to come further in that direction is today an established method for diesel engines. EGR reduces the emissions of nitrogen oxides with a low penalty in fuel consumption.

The increasingly hard regulations on emissions put high pressure on the manufacturers to improve these systems. The present work aims at increasing the knowledge in the area of EGR. Two of the main challenges when applying EGR are addressed, efficiency and mixing.

The efficiency of the EGR-system is analyzed, focusing on keeping the fuel penalty low for a given EGR-rate. Different layouts of the EGR system are studied and compared regarding their stationary and transient properties. Exergy analysis is used to show the potential for improvement in different system components. In the same time, exergy analysis as a tool is introduced and compared to energy analysis of a system. The usefulness of exergy analysis of the entire gas exchange is shown by the example of a heavy-duty diesel engine.

The problem of EGR and air mixing is approached by a detailed study of the mixing process in a heavy-duty diesel engine. Different methods for the measurement of EGR distribution are presented and compared. Additionally, the possibility to predict the mixing effects by 1-D and 3-D simulation is assessed. It is shown that the mixing between air and EGR is highly dependent on the pulsating nature of the flow. The EGR is shown to be transported in packets in the air flow. This leads to the conclusion that mixing not only at the mixing point, but also mixing in flow direction needs to be optimized, as the distribution of EGR between the cylinders is dependent on the timing between the passage of the EGR packets and the valve opening time.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. viii, 75 p.
Series
TRITA-MMK, ISSN 1400-1179 ; 2014:01
Keyword
EGR, Exergy, mixing, pulsating flow, HP-EGR, LP-EGR, high-pressure EGR, low-pressure EGR
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-140850 (URN)978-91-7501-997-0 (ISBN)
Public defence
2014-02-28, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20140203

Available from: 2014-02-03 Created: 2014-02-02 Last updated: 2014-02-03Bibliographically approved

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