NDLI: Experiment of static and dynamic characteristics of spiral grooved seals

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Experiment of static and dynamic characteristics of spiral grooved seals

Content Provider	NASA Technical Reports Server (NTRS)
Author	Sheng, B. C. Iwatsubo, T. Ono, M.
Copyright Year	1991
Description	The leakages and the dynamic characteristics of six types of spiral grooved seals are experimentally investigated. The effect of the helix angle of the seal is investigated mainly under the condition of the same nominal clearances, land and groove lengths, and groove depths. The dynamic characteristics are measured for various parameters such as preswirl velocity, pressure difference between inlet and outlet of the seal, whirling amplitude, whirling speed, and rotating speed of the rotor. The results are also compared with leakage increases with the increase of the helix angle, but as the rotating speed increases, the leakages of the larger helix angle seals quickly drop. The leakage of the smooth-stator (SS)/smooth-grooved rotor (SGR) seal drops faster than that of the spiral-grooved stator (SGS)/smooth-rotor (SR) seal. It is found that a circumferential flow can be produced by the flow along the helix angle direction, and this circumferential flow acts as a negative swirl. For the present helix angle range, there is an optimum helix angle with which the seal has a comparatively positive effect on the rotor stability. Compared with the SGS/SR seals, the SS/SGR seal has a worse effect on the rotor stability.
File Size	491830
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920005143
Archival Resource Key	ark:/13960/t6935r72c
Language	English
Publisher Date	1991-10-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Leakage Rotary Stability Seals Stoppers Dynamic Characteristics Turbine Pumps Rotors Stators Static Characteristics Helices Grooves Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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