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The performance of a 1.5 stage axial turbine with a non-axisymmetric casing at off-design conditions

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conference contribution
posted on 21.05.2020, 15:44 by A Rona, HT Kadhim, HMB Obaida, K Leschke
Advances in manufacturing techniques allow greater freedom in designing axial turbine stage passages, including non-axisymmetric end walls. A non-axisymmetric end wall design method for the stator casing is implemented through a novel surface definition, towards mitigating secondary flow losses. The new design is compared with a diffusion design from the literature. Off-design operations are considered. Numerical predictions of a 1.5 stage axial turbine show a reduction in the rotor row total pressure loss of 1.69 % against the benchmark axisymmetric stage from RTWH Aachen, which is validated against experiment. Flow analysis gives an insight into the effectiveness of the new surface definition approach, which is implemented using Alstom Process and Optimization Workbench (APOW) software at design conditions. The numerical predictions show that performance is retained at off-design conditions.

Funding

This work was undertaken under the auspices of the GE – University of Leicester framework agreement. Advice from Dr. N. Z. Ince and Dr. M. Willetts, GE, is gratefully acknowledged. The Higher Committee for Education Development in Iraq (HCED), is acknowledged. This research used the ALICE high performance computing facility at the University of Leicester. Graphical rendering software licenses were originally acquired with EPSRC support on Grant GR/N23745/01. The supply of experimental data for the 1.5 stage axial flow turbine “Aachen turbine” under license by RWTH Aachen is gratefully acknowledged.

History

Citation

Energy Procedia Volume 142, December 2017, Pages 1185-1191

Source

9th International Conference on Applied Energy, ICAE2017, 21-24 August 2017, Cardiff, UK

Version

VoR (Version of Record)

Published in

Energy Procedia

Volume

142

Pagination

1185-1191

Publisher

Elsevier

issn

1876-6102

Acceptance date

05/06/2017

Copyright date

2018

Spatial coverage

Cardiff, UK

Temporal coverage: start date

21/08/2017

Temporal coverage: end date

24/09/2017

Language

en

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