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Assessment of Partial-Admission Characteristics in Twin-Entry Turbine Pulse Performance Modelling

[+] Author Affiliations
Meng Soon Chiong, Srithar Rajoo

Universiti Teknologi Malaysia, Johor, Malaysia

Alessandro Romagnoli

Nanyang Technological University, Singapore

Aaron W. Costall, Ricardo F. Martinez-Botas

Imperial College London, London, UK

Paper No. GT2015-42687, pp. V02CT42A022; 17 pages
doi:10.1115/GT2015-42687
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 2C: Turbomachinery
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5665-9
  • Copyright © 2015 by ASME

abstract

One-dimensional modelling of a twin-entry turbine usually considers only the full-admission characteristic in their analysis. However, due to out-of-phase exhaust flow, the actual operating environment is constantly under the intermittent combination of full, unequal and partial-admission conditions. This leads to unsatisfactory on-engine performance prediction, even though some present models have already accounted the finite twin-entry volute and interaction between the volute entries. This paper explores the potential improvement in twin-entry pulse flow model by including the partial-admission characteristics through the established one-dimensional model domain. The predicted results are validated against the experimental data obtained from the Imperial College pulse-flow testing facility. In addition, influences of the quality of partial-admission performance map are also analysed. The mathematical prediction methodology, which was revised from literature works, derived the twin-entry turbine partial-admission characteristics from the known full-admission performance. This study is intended to outline the importance of twin-entry turbine partial-admission characteristics in pulse performance modelling. In comparison to the literature findings, current model has satisfactorily resolved the twin-entry out-of-phase pulse flow performance, particularly the instantaneous actual power. The model prediction shows a twin-entry turbine unsteady swallowing capacity is mostly encapsulated within the quasi-steady full and partial-admission characteristic lines. On the other hand, the unsteady actual power hysteresis curve is found beyond quasi-steady characteristic lines at most instant throughout the pulse cycle.

Copyright © 2015 by ASME
Topics: Modeling , Turbines

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