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Aerodynamic performance of conventional and advanced design labyrinth seals with solid-smooth abradable, and honeycomb landsLabyrinth air seal static and dynamic performance was evaluated using solid, abradable, and honeycomb lands with standard and advanced seal designs. The effects on leakage of land surface roughness, abradable land porosity, rub grooves in abradable lands, and honeycomb land cell size and depth were studied using a standard labyrinth seal. The effects of rotation on the optimum seal knife pitch were also investigated. Selected geometric and aerodynamic parameters for an advanced seal design were evaluated to derive an optimized performance configuration. The rotational energy requirements were also measured to determine the inherent friction and pumping energy absorbed by the various seal knife and land configurations tested in order to properly assess the net seal system performance level. Results indicate that: (1) seal leakage can be significantly affected with honeycomb or abradable lands; (2) rotational energy absorption does not vary significantly with the use of a solid-smooth, an abradable, or a honeycomb land; and (3) optimization of an advanced lab seal design produced a configuration that had leakage 25% below a conventional stepped seal.
Document ID
19780019484
Document Type
Contractor Report (CR)
Authors
Stocker, H. L. (Detroit Diesel Allison Indianapolis, IN, United States)
Cox, D. M. (Detroit Diesel Allison Indianapolis, IN, United States)
Holle, G. F. (Detroit Diesel Allison Indianapolis, IN, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1977
Subject Category
MECHANICAL ENGINEERING
Report/Patent Number
NASA-CR-135307
EDR-9339
Funding Number(s)
CONTRACT_GRANT: NAS3-20056
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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