Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 3 Citations

Abstract

The adoption of two stage serial turbochargers in combination with internal combustion engines can improve the overall efficiency of powertrain systems. In conjunction with the increase of engine volumetric efficiency, two stage boosting technologies are capable of increasing torque and pedal response of small displacement engines. In two stage serial turbocharges, a high pressure (HP) and a low pressure (LP) turbocharger are connected by a series of ducts. The former can increase charge pressure for low air mass flow typical of low engine speed. The latter has a bigger size and can cooperate with higher mass flows. In serial configuration, turbochargers are packaged in a way that the exhaust gases access the LP turbine after exiting the HP turbine. On the induction side, fresh air is compressed sequentially by LP and HP compressors. By-pass valves and waste-gated turbines are often included in two stage boosting systems in order to regulate turbochargers operations. One-dimensional modelling approaches are considered for investigating the integration of boosting systems with internal combustion engines. In this scenario, turbocharger behaviour are input in the powertrain models through previously measured compressor and turbine maps in turbocharger gas stands. However, this procedure does not capture all the effects that occur on engine application such as heat transfer, friction and flow motion that influence the turbochargers operations. This is of particular importance for two stage serial turbochargers where the LP compressor may induce a swirling motion to the flow at the entry of the HP compressor. In addition, flow non-uniformities caused by bends between the two compressors can make the HP compressor perform differently. In this paper, a review of the available literature containing approaches to quantify the effects of heat transfer on turbocharger efficiency and the flow influence in the prediction of two stage serial turbochargers performance is explored.
LanguageEnglish
Title of host publicationSAE 12th International Conference on Engines & Vehicles (ICE), 2015
PublisherSAE International
Number of pages18
DOIs
StatusPublished - 2 Jul 2015

Fingerprint

Compressors
Turbines
Engines
Powertrains
Internal combustion engines
Heat transfer
Compressed air
Exhaust gases
Ducts
Torque
Friction
Air
Gases

Cite this

Avola, C., Copeland, C., Duda, T., Burke, R., Akehurst, S., & Brace, C. (2015). Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems. In SAE 12th International Conference on Engines & Vehicles (ICE), 2015 [2015-24-2523] SAE International. DOI: 10.4271/2015-24-2523

Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems. / Avola, Calogero; Copeland, Colin; Duda, Tomasz; Burke, Richard; Akehurst, Sam; Brace, Christian.

SAE 12th International Conference on Engines & Vehicles (ICE), 2015. SAE International, 2015. 2015-24-2523.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Avola, C, Copeland, C, Duda, T, Burke, R, Akehurst, S & Brace, C 2015, Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems. in SAE 12th International Conference on Engines & Vehicles (ICE), 2015., 2015-24-2523, SAE International. DOI: 10.4271/2015-24-2523
Avola C, Copeland C, Duda T, Burke R, Akehurst S, Brace C. Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems. In SAE 12th International Conference on Engines & Vehicles (ICE), 2015. SAE International. 2015. 2015-24-2523. Available from, DOI: 10.4271/2015-24-2523
@inproceedings{e9a467b48a93483aa1f1b39f944799bc,
title = "Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems",
abstract = "The adoption of two stage serial turbochargers in combination with internal combustion engines can improve the overall efficiency of powertrain systems. In conjunction with the increase of engine volumetric efficiency, two stage boosting technologies are capable of increasing torque and pedal response of small displacement engines. In two stage serial turbocharges, a high pressure (HP) and a low pressure (LP) turbocharger are connected by a series of ducts. The former can increase charge pressure for low air mass flow typical of low engine speed. The latter has a bigger size and can cooperate with higher mass flows. In serial configuration, turbochargers are packaged in a way that the exhaust gases access the LP turbine after exiting the HP turbine. On the induction side, fresh air is compressed sequentially by LP and HP compressors. By-pass valves and waste-gated turbines are often included in two stage boosting systems in order to regulate turbochargers operations. One-dimensional modelling approaches are considered for investigating the integration of boosting systems with internal combustion engines. In this scenario, turbocharger behaviour are input in the powertrain models through previously measured compressor and turbine maps in turbocharger gas stands. However, this procedure does not capture all the effects that occur on engine application such as heat transfer, friction and flow motion that influence the turbochargers operations. This is of particular importance for two stage serial turbochargers where the LP compressor may induce a swirling motion to the flow at the entry of the HP compressor. In addition, flow non-uniformities caused by bends between the two compressors can make the HP compressor perform differently. In this paper, a review of the available literature containing approaches to quantify the effects of heat transfer on turbocharger efficiency and the flow influence in the prediction of two stage serial turbochargers performance is explored.",
author = "Calogero Avola and Colin Copeland and Tomasz Duda and Richard Burke and Sam Akehurst and Christian Brace",
year = "2015",
month = "7",
day = "2",
doi = "10.4271/2015-24-2523",
language = "English",
booktitle = "SAE 12th International Conference on Engines & Vehicles (ICE), 2015",
publisher = "SAE International",
address = "USA United States",

}

TY - GEN

T1 - Review of turbocharger mapping and 1D modelling inaccuracies with specific focus on two-stage systems

AU - Avola,Calogero

AU - Copeland,Colin

AU - Duda,Tomasz

AU - Burke,Richard

AU - Akehurst,Sam

AU - Brace,Christian

PY - 2015/7/2

Y1 - 2015/7/2

N2 - The adoption of two stage serial turbochargers in combination with internal combustion engines can improve the overall efficiency of powertrain systems. In conjunction with the increase of engine volumetric efficiency, two stage boosting technologies are capable of increasing torque and pedal response of small displacement engines. In two stage serial turbocharges, a high pressure (HP) and a low pressure (LP) turbocharger are connected by a series of ducts. The former can increase charge pressure for low air mass flow typical of low engine speed. The latter has a bigger size and can cooperate with higher mass flows. In serial configuration, turbochargers are packaged in a way that the exhaust gases access the LP turbine after exiting the HP turbine. On the induction side, fresh air is compressed sequentially by LP and HP compressors. By-pass valves and waste-gated turbines are often included in two stage boosting systems in order to regulate turbochargers operations. One-dimensional modelling approaches are considered for investigating the integration of boosting systems with internal combustion engines. In this scenario, turbocharger behaviour are input in the powertrain models through previously measured compressor and turbine maps in turbocharger gas stands. However, this procedure does not capture all the effects that occur on engine application such as heat transfer, friction and flow motion that influence the turbochargers operations. This is of particular importance for two stage serial turbochargers where the LP compressor may induce a swirling motion to the flow at the entry of the HP compressor. In addition, flow non-uniformities caused by bends between the two compressors can make the HP compressor perform differently. In this paper, a review of the available literature containing approaches to quantify the effects of heat transfer on turbocharger efficiency and the flow influence in the prediction of two stage serial turbochargers performance is explored.

AB - The adoption of two stage serial turbochargers in combination with internal combustion engines can improve the overall efficiency of powertrain systems. In conjunction with the increase of engine volumetric efficiency, two stage boosting technologies are capable of increasing torque and pedal response of small displacement engines. In two stage serial turbocharges, a high pressure (HP) and a low pressure (LP) turbocharger are connected by a series of ducts. The former can increase charge pressure for low air mass flow typical of low engine speed. The latter has a bigger size and can cooperate with higher mass flows. In serial configuration, turbochargers are packaged in a way that the exhaust gases access the LP turbine after exiting the HP turbine. On the induction side, fresh air is compressed sequentially by LP and HP compressors. By-pass valves and waste-gated turbines are often included in two stage boosting systems in order to regulate turbochargers operations. One-dimensional modelling approaches are considered for investigating the integration of boosting systems with internal combustion engines. In this scenario, turbocharger behaviour are input in the powertrain models through previously measured compressor and turbine maps in turbocharger gas stands. However, this procedure does not capture all the effects that occur on engine application such as heat transfer, friction and flow motion that influence the turbochargers operations. This is of particular importance for two stage serial turbochargers where the LP compressor may induce a swirling motion to the flow at the entry of the HP compressor. In addition, flow non-uniformities caused by bends between the two compressors can make the HP compressor perform differently. In this paper, a review of the available literature containing approaches to quantify the effects of heat transfer on turbocharger efficiency and the flow influence in the prediction of two stage serial turbochargers performance is explored.

UR - http://papers.sae.org/2015-24-2523/

UR - http://dx.doi.org/10.4271/2015-24-2523

U2 - 10.4271/2015-24-2523

DO - 10.4271/2015-24-2523

M3 - Conference contribution

BT - SAE 12th International Conference on Engines & Vehicles (ICE), 2015

PB - SAE International

ER -