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http://dx.doi.org/10.6108/KSPE.2016.20.4.087

Mechanical Isolation Method for an Air Intake Duct with Vertical Temperature Gradient  

Jung, Chihoon (The 4th R&D Institute - 5th Directorate, Agency for Defense Development)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.20, no.4, 2016 , pp. 87-93 More about this Journal
Abstract
In a Direct Connect(DC) mode altitude engine test, a labyrinth seal is set up between an air intake duct and an engine. The labyrinth seal plays a key role in mechanically isolating them, which contributes to the accurate measurement of thrust and the other component forces. However, when high vertical temperature gradient is generated in the supplied air in the duct, the isolation breaks down. In this paper, a labyrinth seal control device is designed and installed in an effort to eliminate the issue. Test result shows the device successfully gets rid of the contact problem even when high vertical temperature gradient is produced.
Keywords
Labyrinth Seal Isolation; Thrust Measurement System(TMS); Vertical Temperature Gradient; Air Intake Duct; Thermal Expansion;
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