Research Papers

Experimental Analysis of the Interaction Between Rim Seal and Main Annulus Flow in a Low Pressure Two Stage Axial Turbine

[+] Author and Article Information
Heinz-Peter Schiffer

Large Scale Turbine Rig,
Department of Gas Turbines and
Aerospace Propulsion,
Technische Universität Darmstadt,
Darmstadt 64287, Germany

Manuscript received August 24, 2012; final manuscript received October 19, 2012; published online June 24, 2013. Editor: David Wisler.

J. Turbomach 135(5), 051003 (Jun 24, 2013) (9 pages) Paper No: TURBO-12-1179; doi: 10.1115/1.4023015 History: Received August 24, 2012; Revised October 19, 2012

The spoiling effects of rim seal flow are studied at the Large Scale Turbine Rig (LSTR) at Technische Universität Darmstadt. Detailed flow field measurements and efficiency measurements were performed for various ingress and egress setups and will be presented in this paper. Efficiency measurements show an efficiency decrease as the rim seal mass flow is increased. Five hole probe measurements upstream and downstream of the second stator row show that an increasing rim seal mass flow leads to an increased pressure loss across the stator, to altered incidence angles and to an intensification of secondary flow structures within the lower 50% span. Static pressure taps at the stator profile primarily show altered aerodynamic loading with increased rim seal air. In addition, the end wall profile pressure was measured at the stator 2 hub. It can be seen that seal air injection causes increased pressure fluctuations on the platform. Temperature measurements with a temperature difference between rim seal and main annulus flow show that rim seal air primarily enters the passage vortex.

Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Mixing losses due to seal air injection

Grahic Jump Location
Fig. 2

General setup of the LSTR

Grahic Jump Location
Fig. 3

Schematic of LSTR air flows and instrumentation positions

Grahic Jump Location
Fig. 4

Efficiency measurements, design point

Grahic Jump Location
Fig. 5

Definition of radial and yaw angle

Grahic Jump Location
Fig. 6

Mach number distribution at MP03, upstream of the rim seal

Grahic Jump Location
Fig. 7

Radial angle distribution at MP03, upstream of the rim seal

Grahic Jump Location
Fig. 8

Pressure loss across stator row 2

Grahic Jump Location
Fig. 9

Temperature measurement for different seal air temperatures; 1% seal air

Grahic Jump Location
Fig. 10

Mach number distribution at MP04

Grahic Jump Location
Fig. 11

Circumferentially averaged Mach number distribution at MP04

Grahic Jump Location
Fig. 12

Yaw angle distribution, MP04

Grahic Jump Location
Fig. 13

Circumferentially averaged yaw angle at MP04

Grahic Jump Location
Fig. 14

Radial angle distribution, MP04

Grahic Jump Location
Fig. 15

Profile pressure distribution at 5% span height

Grahic Jump Location
Fig. 16

Profile pressure distribution at 20% span height

Grahic Jump Location
Fig. 17

Stator end wall pressure distribution

Grahic Jump Location
Fig. 18

Static pressure in wheelspace cavity and main annulus, MP03




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