Stress levels predicted by conventional disk modeling assumptions are lower than expected to cause conventional creep or fatigue damage consistent with slot failures experienced in some compressor and turbine disks. It was suspected that disparate slot to slot friction at the blade root surface will result in sticking of some blade roots as the turbine is shut down while adjacent blades slip; the un-resisted stuck root would pry the steeples apart causing additional bending stress. Testing of a blade root/disk slot pair in a load frame found that the blade root will stick in place as imposed radial loads decrease. Simulation of blade root movement during shutdown indicates peak stress can increase by 20% or more depending on geometric factors. The slot stress only rises above its maximum speed condition on shutdown (at 80% Max Speed in the example case). This brief stress rise will not cause significant creep damage, but can shorten disk life based on low cycle fatigue or hold time fatigue damage.
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ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
June 6–10, 2011
Vancouver, British Columbia, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5466-2
PROCEEDINGS PAPER
Effect of Non-Uniform Blade Root Friction and Sticking on Disk Stresses
Harold R. Simmons,
Harold R. Simmons
Southwest Research Institute®, San Antonio, TX
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Vishwas Iyengar
Vishwas Iyengar
Southwest Research Institute®, San Antonio, TX
Search for other works by this author on:
Harold R. Simmons
Southwest Research Institute®, San Antonio, TX
Vishwas Iyengar
Southwest Research Institute®, San Antonio, TX
Paper No:
GT2011-46689, pp. 829-838; 10 pages
Published Online:
May 3, 2012
Citation
Simmons, HR, & Iyengar, V. "Effect of Non-Uniform Blade Root Friction and Sticking on Disk Stresses." Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 6: Structures and Dynamics, Parts A and B. Vancouver, British Columbia, Canada. June 6–10, 2011. pp. 829-838. ASME. https://doi.org/10.1115/GT2011-46689
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