Imperial College London
Alternate

ProfessorRicardoMartinez-Botas

Faculty of Engineering, Department of Mechanical Engineering

Associate Dean Industry Partnerships,Prof of Turbomachinery
 
 
 
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Contact

 

+44 (0)20 7594 7241r.botas Website

 
 
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Location

 

611City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Palenschat:2018,
author = {Palenschat, T and Cortell, JF and Newton, P and Martinez-Botas, RF and Palenschat, T and Müller, M and Rajoo, S},
pages = {443--458},
title = {Numerical study of the quasi-steady approach applied to an asymmetric twin-scroll volute turbocharger turbine for a heavy duty diesel engine under realistic boundary conditions},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - This paper presents a numerical study on the validity of the quasi-steady approach with respect to an asymmetric twin-scroll turbocharger heavy duty diesel engine under realistic boundary conditions. The motivation of using the quasi-steady approach in this context is the possibility to speed up the evaluation process in early design steps while already taking into account boundary conditions more suitable than equal admission. As transient 3D CFD is computationally very expensive, the quasi-steady approach is used to reduce computational time drastically. However, the validity of the quasi-steady approach is widely discussed and does not hold for the volute. Furthermore, it has never been evaluated for an asymmetric twin-scroll turbine and unequal admission. A 3D CFD model is built in this paper using the Ansys tool chain. The computational model is validated against experiments carried out at the cold-gas turbocharger test facility of Imperial College London. The boundary conditions for the analysis are selected based upon the real load conditions of a Mercedes-Benz lorry on a given route and take into account equal and unequal admission between the two scrolls. A set of steady computations is performed using the unequal and equal boundary admission conditions of the discretised pulsations. The cycle efficiency is computed in order to find a metric to compare the steady and unsteady approaches. Following, unsteady computations are performed with unsteady boundary conditions to capture the real pulsating boundary conditions resulting from the engine. Steady as well as unsteady computations are compared in order to evaluate the validity of the quasi-steady approach. Finally, the same comparison is also shown based on experimental data.
AU  - Palenschat,T
AU  - Cortell,JF
AU  - Newton,P
AU  - Martinez-Botas,RF
AU  - Palenschat,T
AU  - Müller,M
AU  - Rajoo,S
EP  - 458
PY  - 2018///
SP  - 443
TI  - Numerical study of the quasi-steady approach applied to an asymmetric twin-scroll volute turbocharger turbine for a heavy duty diesel engine under realistic boundary conditions
ER  -
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