Numerical investigation of two-stage turbocharging systems performance

Calogero Avola, Colin Copeland, Richard Burke, Christian Brace

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

4 Citations (SciVal)


In regulated two-stage sequential turbocharging systems, a smaller, high pressure (HP), and a larger, low pressure (LP), turbocharger are sequentially positioned to recover the energy available in the exhaust gases and deliver acceptable level of boost to the intake of an internal combustion engine. Due to the different sizes of the turbochargers, by-pass valves are placed in the system to control operations. Due to the turbocharging system layout, it is clear that the air pressurized by the LP compressor enters nonuniformly the HP compressor. This is caused by the rotating radial compressor and the interconnecting bends which cause swirl and velocity to scatter, respectively. Furthermore, the heat transfer in the two turbochargers may have an effect on the apparent efficiencies. For these reasons, the standard mapping approach for turbochargers is not able to take into account the effect of non-uniform flow and heat transfer. In this paper, a novel approach for mapping the two-stage turbocharging system is proposed and performed into a monodimensional simulation code. Although, flow non-uniformity and turbochargers heat transfer effects on the performance of the turbocharging system are not considered, at this present time, the study centralizes on the investigation and the validation of the mapping approach. In fact, a two-stage sequential turbocharging system has been considered for the study and a simulation code to investigate the mapping technique has been implemented.

Original languageEnglish
Title of host publicationASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850503
Publication statusPublished - 9 Oct 2016
EventASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016 - Greenville, USA United States
Duration: 9 Oct 201612 Oct 2016


ConferenceASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016
Country/TerritoryUSA United States


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