Research Papers: Gas Turbines: Structures and Dynamics

The Impact of Hole Depth on the Rotordynamic and Leakage Characteristics of Hole-Pattern-Stator Gas Annular Seals

[+] Author and Article Information
Dara W. Childs

The Leland T. Jordan Chair
of Mechanical Engineering
e-mail: dchilds@tamu.edu

Stephen Arthur

Graduate Research Assistant
e-mail: sarthur88@gmail.com
Turbomachinery Laboratory,
Texas A&M University,
College Station, TX 77843

Naitik J. Mehta

Mechanical Engineer-Rotating Equipment,
Bechtel OG&C,
Houston, TX 77056
e-mail: nmehta1@bechtel.com

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 30, 2013; final manuscript received August 14, 2013; published online December 10, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(4), 042501 (Dec 10, 2013) (6 pages) Paper No: GTP-13-1282; doi: 10.1115/1.4025888 History: Received July 30, 2013; Revised August 14, 2013

Test results are presented for rotordynamic characteristics of hole-pattern-stator annular gas seals at a 70 bar supply pressures with a running speed of 20,200 rpm. Leakage results are presented for these conditions and the additional speeds: 10,200 and 15,300 rpm. Hole-depth is the principal test variable of interest. Most published annular test data for these seals have a hole diameter of 3.175 mm and a hole depth of 3.302 mm. For this work, with the 3.175 mm hole diameter, additional results are presented for shallow (1.905 mm) and deep (6.604 mm) hole depths. Test results show a pronounced dependence of leakage and rotordynamic behavior on hole depth. Test results show much better leakage performance for the shallow-hole-depth seal in both leakage and rotordynamic performance. Compressor manufacturers and users will need to decide whether this observed performance improvement is worth trying in real machines.

Copyright © 2014 by ASME
Topics: Stators , Leakage , Damping
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Test seal hole pattern [3]

Grahic Jump Location
Fig. 2

Effect of varying hd on friction factor for smooth-on-hole configuration (Pin = 84 bar, Ø = 3.175 mm, and plate clearance = 0.635 mm) [3]

Grahic Jump Location
Fig. 3

Cross section of the air seal test rig [1]

Grahic Jump Location
Fig. 4

Test stator assembly [1]

Grahic Jump Location
Fig. 5

Cross section view of the preswirl rings and pitot tube location [1]

Grahic Jump Location
Fig. 6

Measured m· results for three hole depths

Grahic Jump Location
Fig. 7

Measured Kxx*(Ω) results for three hole depths

Grahic Jump Location
Fig. 8

Measured Kxy*(Ω) results for three hole depths

Grahic Jump Location
Fig. 9

Measured Cxx*(Ω) results for three hole depths

Grahic Jump Location
Fig. 10

Measured Ceff*(Ω) results for three hole depths




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In