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Sealing in TurbomachineryClearance control is of paramount importance to turbomachinery designers and is required to meet today's aggressive power output, efficiency, and operational life goals. Excessive clearances lead to losses in cycle efficiency, flow instabilities, and hot gas ingestion into disk cavities. Insufficient clearances limit coolant flows and cause interface rubbing, overheating downstream components and damaging interfaces, thus limiting component life. Designers have put renewed attention on clearance control, as it is often the most cost effective method to enhance system performance. Advanced concepts and proper material selection continue to play important roles in maintaining interface clearances to enable the system to meet design goals. This work presents an overview of turbomachinery sealing to control clearances. Areas covered include: characteristics of gas and steam turbine sealing applications and environments, benefits of sealing, types of standard static and dynamics seals, advanced seal designs, as well as life and limitations issues.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Chupp, Raymond E.
(General Electric Global Research Niksayuna, NY, United States)
Hendricks, Robert C.
(NASA Glenn Research Center Cleveland, OH, United States)
Lattime, Scott B.
(Timken Co. Canton, OH, United States)
Steinetz, Bruce M.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
August 1, 2006
Subject Category
Mechanical Engineering
Report/Patent Number
Distribution Limits
Public Use Permitted.
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