The integration of monolithic ceramic blades into sub-megawatt microturbines is a low-cost option for increasing Turbine Inlet Temperature and efficiency. The Inside-Out Ceramic Turbine (ICT) is a promising concept for the integration of ceramic blades by loading each blades in compression using a carbon-polymer composite rim to convert the blade radial loads to tangential hoop stress. High tangential velocities lead to elevated radial displacement of the rim and, therefore, the rotor hub needs to be able to maintain the contact with the blades for a large range of radial displacements. This displacements comes with hub structural challenges and rotordynamics considerations. For these reasons, blade tip speed have been previously limited to about 360 m/s. This paper presents a hub design that allows high radial displacement using the combination of inclined blade roots, inclined hub grooves and an axial spring. The contact between the blade root and the hub is maintained through the inclined planes by the axial forces from the spring creating internal friction in the rotor that can induce sub-synchronous rotordynamics instabilities. The onset of instabilities is investigated experimentally with cold spin tests of a simplified ICT prototype. The results first show that the concept remains stable up to the maximum speed tested of 127 kRPM (tip speed of 387 m/s) if the spring is designed such that it remains in contact with the blade roots at all time. On the other hand, when reducing the preload sufficiently to test the limits of the concept, the rotor first mode became unstable at 120 kRPM resulting in failure of the prototype. These results suggest that, provided a sufficient spring preload to prevent excessive relative motion, the blades can reach the desired radial displacements, removing the main constraint on ICT tip speed.
Skip Nav Destination
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5113-5
PROCEEDINGS PAPER
Rotordynamics Experimental Validation of a Sliding-Blade Architecture for an Inside-Out Ceramic Turbine Available to Purchase
C. Landry,
C. Landry
Université de Sherbrooke, Sherbrooke, QC, Canada
Search for other works by this author on:
B. Picard,
B. Picard
Université de Sherbrooke, Sherbrooke, QC, Canada
Search for other works by this author on:
T. Parent-Simard,
T. Parent-Simard
Université de Sherbrooke, Sherbrooke, QC, Canada
Search for other works by this author on:
J.-S. Plante,
J.-S. Plante
Université de Sherbrooke, Sherbrooke, QC, Canada
Search for other works by this author on:
M. Picard
M. Picard
Université de Sherbrooke, Sherbrooke, QC, Canada
Search for other works by this author on:
C. Landry
Université de Sherbrooke, Sherbrooke, QC, Canada
B. Picard
Université de Sherbrooke, Sherbrooke, QC, Canada
T. Parent-Simard
Université de Sherbrooke, Sherbrooke, QC, Canada
J.-S. Plante
Université de Sherbrooke, Sherbrooke, QC, Canada
M. Picard
Université de Sherbrooke, Sherbrooke, QC, Canada
Paper No:
GT2018-76698, V07AT33A024; 9 pages
Published Online:
August 30, 2018
Citation
Landry, C, Picard, B, Parent-Simard, T, Plante, J, & Picard, M. "Rotordynamics Experimental Validation of a Sliding-Blade Architecture for an Inside-Out Ceramic Turbine." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 7A: Structures and Dynamics. Oslo, Norway. June 11–15, 2018. V07AT33A024. ASME. https://doi.org/10.1115/GT2018-76698
Download citation file:
50
Views
Related Proceedings Papers
Related Articles
System-Level Performance of Microturbines With an Inside-Out Ceramic Turbine
J. Eng. Gas Turbines Power (June,2017)
Progress on the European Gas Turbine Program “AGATA”
J. Eng. Gas Turbines Power (January,1998)
Related Chapters
The Direct Contribution of Spin-Down Compression for Rotochemical Deviations in Stars Containing Mixed- Phase Matter
International Conference on Advanced Computer Theory and Engineering, 4th (ICACTE 2011)
Verifying of a Network Cryptographic Protocol Using the Model Checking Tools
International Conference on Software Technology and Engineering (ICSTE 2012)
Section III: Subsections NC and ND — Class 2 and 3 Components
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Fourth Edition