Abstract
Abradable seals have long been used to enhance turbomachinery performance by limiting blade tip leakage losses. Most of the literature regarding this subject has focused on aerospace gas turbine materials and conditions for high blade tip speeds. Furthermore, testing and evaluation described in the literature has been conducted on disparate rigs, making direct comparison among the abradable materials investigated difficult. This paper continues on the work reported in ASME TE01HT02-06 by measuring blade tip temperatures in rig tests simulating the low speed rub conditions found in utility gas turbine compressors and steam turbines. Abradable materials evaluated include fibermetal, thermal-sprayed coatings and honeycomb.
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