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DTIC ADA080620: Thermal Response Turbine Shroud Study.
by Defense Technical Information Center
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The program objective was to evaluate active clearance
controls (ACC) for future military fighter and transport
aircraft/engines, rank the candidate schemes, and
recommend a future course of action. Fifty-one potential
ACC concepts were reduced to twelve: five mechanical, two
pneumatic, and five thermal. The fighter and transport
missions selected were the Advanced Tactical Fighter
(ATF), and the C141X strategic aircraft. Three levels of
controls for ACC were considered: simple on/off two-
position; open loop infinitely variable; and feedback
(requiring a clearance sensor). On/off systems were
selected for study because the majority of the benefit is
obtained during cruise/dash and the open and feedback
systems have positioning and reliability uncertainties.
The criteria selected to evaluate the different schemes
were net Life Cycle Cost benefits, to the fleet over the
life of the weapons system. These criteria were based on
a new-engine/new-aircraft application where efficiency
improvements due to ACC were used to reduce aircraft and
engine size for a fixed mission (range, payload, etc.).
The detailed operation and impact (cost, weight,
reliability, maintainability) of the twelve final schemes
were evaluated by adopting each of the candidate schemes
to selected stages in the base engines. ACC showed a
significant net benefit in the transport high pressure
turbine. On the low pressure turbine some schemes showed
a net savings, but the amount was small. For the fighter
application, ACC showed a significant net benefit in the
high pressure turbine only.
Date Published: 2017-11-07 19:54:11
Identifier: DTIC_ADA080620
Item Size: 104876918
Language: english
Media Type: texts
# Topics
DTIC Archive; Kawecki,E J ; PRATT AN...
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