Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Kalibrering av en transient GT-Power modell av en SI PFI turbo motor
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2008 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Calibration of a transient GT-power model of a SI PFI turbo Engine (English)
Abstract [sv]

I detta arbete behandlas transient simulering i ett 1D-simuleringsprogram, i detta

fall Gamma technologies GT-Power. Vad som behöver ändras i en modell för att

den skall kunna simulera en motor under transienta driftsfall med god

noggrannhet har undersökts. När detta är gjort, skall det undersökas hur väl den

transient kalibrerade modellen kan simulera en motor med förändrad rörgeometri

på insugs- eller avgassidan, och vad som måste omkalibreras om detta inte är

fallet.

Den viktigaste slutsatsen av detta arbete är vikten av att ha en korrekt framtagen

kompressormapp i modellen. Den som fanns tillgänglig under arbetet hade bara

mätdata ned till 70000 rpm. Detta resulterade i en överskattning av massflödet i

den lägre regionen i den av GT-Power framställda kompressormappen. Detta

pga. att GT-power verkar överskatta massflödet under extrapolationen av

mappen. För att få ett korrekt simulerat turbovarvtal under transienten var turbineffektivitetsmultiplikatorer

introducerade. Med det var inte tillräckligt med tvåpunkts

kalibrering av dessa och låta GT-Power interpolera emellan utan flera

varvtal behövde kalibreras in för att få ett korrekt simulerat turbovarvtal. Andra

viktiga områden att modifiera för att kunna simulera transienter var

förbränningen, luft/bränsleförhållandet och grenrörets termiska egenskaper. När

sedan geometrin i modellen förändrades krävdes en omkalibrering av

turbineffektivitetsmultiplikatorerna.

Studien var uppdelad i en kalibreringsdel och en valideringsdel. I kalibreringsdelen

kalibrerades GM-motorn med modellbeteckningen L850 mot transienta

mätdata. När modellen var kalibrerad studerades hur väl den kunde simulera

samma motor men med olika rörgeometrier på insug och avgassidan. Detta för

att ta reda på hur mycket kalibreringen behöver ändras när geometrin ändras.

Abstract [en]

The subject of this thesis work is to investigate transient simulations in a 1Dsimulation

program, in this case Gamma Technologie’s GT-Power. The

investigation consists of a study what needs to be changed on a model in order

to make it perform transient simulations of an engine with accurate results. And

when the simulation is calibrated the model is validated to see if it can predict

transients accurately when the piping system is changed to different geometries,

and if not what is needed to be recalibrated in the model to do so.

The most important conclusion of this work is the importance to have a correctly

generated compressor map in the model. The one present in the investigation

had only measured data beginning from a turbo speed of 70000 rpm an up. This

resulted in an over-predicted massflow in the lower region of the GT-power

generated compressor map. This is because GT-Power seems to overestimate

the massflow when extrapolating the map. To get an accurately modeled turbo,

turbine efficiency multipliers (TEM) had to be introduced. It was not sufficient to

do a two point calibration and let GT-Power interpolate in between. More

calibrated points had to be introduced to model the turbo speed accurately. Other

important areas to alter to make them able to perform transient simulations are

the combustion, AFR and thermal properties of the exhaust. When changing the

geometry of the piping system the calibrated TEM’s had to be recalibrated.

The study was made up of a calibration part and a validation part. In the

calibration part a model of the GM engine L850 was calibrated against transient

measurements. When the model was calibrated the validation part of the work

commenced by changing the geometry of the piping system around the engine to

se what parts had to be recalibrated.

Place, publisher, year, edition, pages
2008.
Series
MMK 2008:1 MFM117
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-100184OAI: oai:DiVA.org:kth-100184DiVA: diva2:542932
External cooperation
GM Powertrain Sweden,Fredrik Westin
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-06 Created: 2012-08-06 Last updated: 2012-08-06Bibliographically approved

Open Access in DiVA

Erik Bodin-Ek(3370 kB)3012 downloads
File information
File name FULLTEXT01.pdfFile size 3370 kBChecksum SHA-512
0af6f4ff4e7f3e78bbeb82798f6efe600587cba049b7ad8f91471d4c54ea5876b29e97b9d74d33ba4d78c32ed826b5e818dcad70b4786d35bbf7ace7806e1e47
Type fulltextMimetype application/pdf

By organisation
Machine Design (Dept.)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 3012 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 168 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf