Accuracy of turbocharged SI-engine simulations
This licentiate thesis deals mainly with modelling ofturbocharged SIengines. A model of a 4-cylinder engine was runin both steady state and transient conditions and the resultswere compared to measured data. Large differences betweenmeasurements and simulations were detected and the reasons forthis...
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ndltd-UPSALLA1-oai-DiVA.org-kth-14912013-04-19T20:50:14ZAccuracy of turbocharged SI-engine simulationsengWestin, FredrikKTH, MaskinkonstruktionStockholm : Maskinkonstruktion2002boostingturbochargingsuperchargingmodellingsimulationturbineThis licentiate thesis deals mainly with modelling ofturbocharged SIengines. A model of a 4-cylinder engine was runin both steady state and transient conditions and the resultswere compared to measured data. Large differences betweenmeasurements and simulations were detected and the reasons forthis discrepancy were investigated. The investigation showedthat it was the turbocharger turbine model that performed in anon-optimal way. To cope with this, the turbine model containedparameters, which could be adjusted so that the model resultsmatched measured data. However, it was absolutely necessary tohave measured data to match against. It was thus concluded thatthe predictivity of the software tool was too poor to try topredict the performance of various boosting systems. Thereforemeans of improving the modelling procedure were investigated.To enable such an investigation a technique was developed tomeasure the instantaneous power output from, and efficiency of,the turbine when the turbocharger was used on the engine. The projects initial aim was to predict, throughsimulations, the best way to boost a downsized SI-engine with avery high boost-pressure demand. The first simulation run on astandard turbocharged engine showed that this could not be donewith any high accuracy. However, a literature study was madethat presents various different boosting techniques that canproduce higher boost pressure in a larger flow-range than asingle turbocharger, and in addition, with smallerboost-pressure lag. <b>Key words:</b>boosting, turbocharging, supercharging,modelling, simulation, turbine, pulsating flow, unsteadyperformance, SI-engine, measurement accuracy Licentiate thesis, monographinfo:eu-repo/semantics/masterThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1491Trita-MMK, 1400-1179 ; 2002:18application/pdfinfo:eu-repo/semantics/openAccess |
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English |
format |
Others
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boosting turbocharging supercharging modelling simulation turbine |
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boosting turbocharging supercharging modelling simulation turbine Westin, Fredrik Accuracy of turbocharged SI-engine simulations |
description |
This licentiate thesis deals mainly with modelling ofturbocharged SIengines. A model of a 4-cylinder engine was runin both steady state and transient conditions and the resultswere compared to measured data. Large differences betweenmeasurements and simulations were detected and the reasons forthis discrepancy were investigated. The investigation showedthat it was the turbocharger turbine model that performed in anon-optimal way. To cope with this, the turbine model containedparameters, which could be adjusted so that the model resultsmatched measured data. However, it was absolutely necessary tohave measured data to match against. It was thus concluded thatthe predictivity of the software tool was too poor to try topredict the performance of various boosting systems. Thereforemeans of improving the modelling procedure were investigated.To enable such an investigation a technique was developed tomeasure the instantaneous power output from, and efficiency of,the turbine when the turbocharger was used on the engine. The projects initial aim was to predict, throughsimulations, the best way to boost a downsized SI-engine with avery high boost-pressure demand. The first simulation run on astandard turbocharged engine showed that this could not be donewith any high accuracy. However, a literature study was madethat presents various different boosting techniques that canproduce higher boost pressure in a larger flow-range than asingle turbocharger, and in addition, with smallerboost-pressure lag. <b>Key words:</b>boosting, turbocharging, supercharging,modelling, simulation, turbine, pulsating flow, unsteadyperformance, SI-engine, measurement accuracy |
author |
Westin, Fredrik |
author_facet |
Westin, Fredrik |
author_sort |
Westin, Fredrik |
title |
Accuracy of turbocharged SI-engine simulations |
title_short |
Accuracy of turbocharged SI-engine simulations |
title_full |
Accuracy of turbocharged SI-engine simulations |
title_fullStr |
Accuracy of turbocharged SI-engine simulations |
title_full_unstemmed |
Accuracy of turbocharged SI-engine simulations |
title_sort |
accuracy of turbocharged si-engine simulations |
publisher |
KTH, Maskinkonstruktion |
publishDate |
2002 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1491 |
work_keys_str_mv |
AT westinfredrik accuracyofturbochargedsienginesimulations |
_version_ |
1716582832143335424 |