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Overview of NASA Glenn Seal DevelopmentsTurbine engine studies have shown that reducing high pressure turbine (HPT) blade tip clearances will reduce fuel burn, lower emissions, retain exhaust gas temperature margin and increase range. Dr. Lattime presented the design and development status of a new Active Clearance Control Test rig aimed at demonstrating advanced ACC approaches and sensors. Mr. Melcher presented controls considerations for turbine active clearance control. Mr. Geisheimer of Radatech presented an overview of their microwave blade tip sensor technology. Microwave tip sensors show promise of operation in the extreme gas temperatures present in the HPT location. Mr. Justak presented an overview of non-contacting seal developments at Advanced Technologies Group. Dr. Braun presented investigations into a non-contacting finger seal under development by NASA GRC and University of Akron. Dr. Stango presented analytical assessments of the effects of flow-induced radial loads on brush seal behavior. Mr. Flaherty presented innovative seal and seal fabrication developments at FlowServ. Mr. Chappel presented abradable seal developments at Technetics. Dr. Daniels presented an overview of NASA GRC s acoustic seal developments. NASA is investigating the ability to harness high amplitude acoustic waves, possible through a new field of acoustics called Resonant Macrosonic Synthesis, to effect a non-contacting, low leakage seal. Dr. Daniels presented early results showing the ability to restrict flow via acoustic pressures. Dr. Athavale presented numerical results simulating the flow blocking capability of a pre-prototype acoustic seal.
Document ID
Document Type
Conference Paper
Steinetz, Bruce M.
(NASA Glenn Research Center Cleveland, OH, United States)
Proctor, Margaret P.
(NASA Glenn Research Center Cleveland, OH, United States)
Dunlap, Patrick H., Jr.
(NASA Glenn Research Center Cleveland, OH, United States)
Delgado, Irebert
(Army Research Lab. Cleveland, OH, United States)
DeMange, Jeffrey J.
(Toledo Univ. OH, United States)
Daniels, Christopher C.
(Ohio Aerospace Inst. Brook Park, OH, United States)
Lattime, Scott B.
(Ohio Aerospace Inst. Brook Park, OH, United States)
Date Acquired
September 7, 2013
Publication Date
September 1, 2004
Publication Information
Publication: 2003 NASA Seal/Secondary Air System Workshop, Volume 1
Subject Category
Aircraft Propulsion And Power
Distribution Limits
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20040182396Analytic Primary2003 NASA Seal/Secondary Air System Workshop
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