One-dimensional pulse-flow modeling of a twin-scroll turbine

• Published in: Energy (Oxford) 2016-11, Vol.115, p.1291-1304
• Main Authors: Chiong, M.S., Rajoo, S., Romagnoli, A., Costall, A.W., Martinez-Botas, R.F.
• Format: Article
• Language: English
• Subjects: Modeling; One-dimensional; Pulse flow; Turbine; Turbocharger; Twin-scroll; Wave action
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2016.09.041

This paper presents a revised one-dimensional (1D) pulse flow modeling of twin-scroll turbocharger turbine under pulse flow operating conditions. The proposed methodology in this paper provides further consideration for the turbine partial admission performance during model characterization. This gives rise to significant improvement on the model pulse flow prediction quality compared to the previous model. The results show that a twin-scroll turbine is not operating at full admission throughout the in-phase pulse flow conditions. Instead, they are operating at unequal admission state due to disparity in the magnitude of turbine inlet flow. On the other hand, during out-of-phase pulse flow, a twin-scroll turbine is working at partial admission state for majority of the pulse cycle. An amended mathematical correlation in calculating the twin-scroll turbine partial admission characteristics is also presented in the paper. The impact of its accuracy on the pulse flow model prediction is explored. •Paper presents a 1D modeling for twin-scroll turbine under pulsating flow.•Predicted pulse pressure propagation is in good agreement with experimental data.•A methodology is proposed to consider the turbine partial admission performance.•Prediction shows twin-scroll turbine operates at unequal admission during in-phase flow.•During out-of-phase flow a twin-scroll turbine mainly operates at partial admission.