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{Xue:2018,
author = {Xue, YX and Yang, MY and Deng, KY and Romagnoli, A and Martinez-Botas, RF},
pages = {425--441},
title = {Performance and flow analysis of a mixed flow turbine with twin-entry nozzled volute},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - This paper studies the performance and detailed flow field of a nozzled turbine with twin-entry volute (developed by Imperial College London) at different admission conditions via experimentally validated numerical method. Two partial admissions are analysed which are the admission near hub side (referring as HI) and near shroud side (referring as SI), respectively. Results manifest that the efficiency of the case of HI is moderately higher than that of SI although their flow capacity is the same. The performance of unequal admission is bounded by that of the full admission and the partial admission. The breakdown of the flow loss in turbine components shows that significant discrepancies exist among different admissions. The flow loss in the volute Is nearly the same for two cases. However, the loss is moderately higher in the nozzle for SI at all turbine loadings, but notably lower in the rotor for this case when compared with its counterpart. This is caused by the load-dividing between these two cases: the more expansion is divided to the rotor for HI, while more expansion is divided to the nozzle for SI. Flow analysis shows that higher entropy is generated in the nozzle for SI due to strong flow separation on the suction surfaces near the leading edge because of large incidence angle. On the other hand, the flow aligns well with the vane angle for HI near the hub, but a large size vortex rolls up near the shroud side which corresponds to the high entropy generation. Downstream the nozzle, a 'tornado' vortex is developed in the rotor passages for the case HI, which leads to higher entropy generation and hence higher flow loss in rotor. This studyunveils the flow mechanism of performance distinctions at different admission conditions for the turbine with twin-entry nozzled volute, which may enlighten performance improvement of the turbine and hence the internal combustion engine.
AU  - Xue,YX
AU  - Yang,MY
AU  - Deng,KY
AU  - Romagnoli,A
AU  - Martinez-Botas,RF
EP  - 441
PY  - 2018///
SP  - 425
TI  - Performance and flow analysis of a mixed flow turbine with twin-entry nozzled volute
ER  -
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