0
TECHNICAL PAPERS

Experimental Investigations of Clocking in a One-and-a-Half-Stage Transonic Turbine Using Laser Doppler Velocimetry and a Fast Response Aerodynamic Pressure Probe

[+] Author and Article Information
O. Schennach

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Austriaoliver.schennach@tugraz.at

J. Woisetschläger

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Austriajakob.woisetschlaeger@tugraz.at

A. Fuchs, E. Göttlich, A. Marn, R. Pecnik

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Austria

J. Turbomach 129(2), 372-381 (Jul 18, 2006) (10 pages) doi:10.1115/1.2464144 History: Received July 13, 2006; Revised July 18, 2006

The current paper presents experimental clocking investigations of the flow field in midspan in a high-pressure transonic turbine with a downstream vane row (1.5 stage machine). Laser-Doppler-velocimetry measurements were carried out in order to record rotor phase resolved velocity, flow angle, and turbulence distributions upstream and downstream of the second vane row at several different vane-vane positions. Additionally, a fast-response aerodynamic pressure probe was used to get the total pressure distribution downstream of the second vane row for the same positions. Altogether, the measurements were performed for ten different first vane to second vane positions (clocking positions) for measurements downstream of the second vane row and two different clocking positions for measurements upstream of the second vane row. The paper shows that different clocking positions have a significant influence on the flow field downstream of the second vane row. Furthermore, different measurement lines upstream of the second vane row indicate that clocking has nearly no influence on the flow field close to the rotor exit.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Meridional flow path with measurement positions (indicated with dots)

Grahic Jump Location
Figure 2

Profiles at trigger zero position for clocking position 1 (CP1)

Grahic Jump Location
Figure 3

LDV measurement locations in midspan and investigated clocking positions (CP1-CP10)

Grahic Jump Location
Figure 4

Velocity decomposition for phase-averaged data (typical plot downstream of the rotor in line 5)

Grahic Jump Location
Figure 5

Total pressure rake with FRAPP in midpan (plane D3)

Grahic Jump Location
Figure 6

Time-space plots of TKE in plane C for CP1 and CP6 for three different measurement lines

Grahic Jump Location
Figure 7

Time-resolved TKE (left plot) and velocity magnitude in line 5, CP1 and CP6 ((red) dashed line)

Grahic Jump Location
Figure 8

Time-space plots of velocity magnitude in plane C for CP1 and CP6 for three different measurement lines

Grahic Jump Location
Figure 9

Time-resolved TKE (left plot) and velocity magnitude in line 1, leading edge of the second vane row at VP 0.75 for CP1 and VP 1.25 for CP6 ((red) dashed line)

Grahic Jump Location
Figure 10

Time-resolved TKE (left plot) and velocity magnitude in line 1, mid channel of the second vane row at VP 1.25 for CP1 and VP 0.75 for CP6 ((red) dashed line)

Grahic Jump Location
Figure 11

Time-averaged yaw angle distribution in line 1 for CP1 (shifted in space) and CP6 ((red) dashed line)

Grahic Jump Location
Figure 12

Time-averaged TKE (left plot) and velocity magnitude downstream of the second vane row (plane D1) for CP1 and CP6 ((red) dashed line)

Grahic Jump Location
Figure 13

Time-averaged TKE (left plot) and velocity magnitude downstream of the second vane row (plane D1) for CP6 ((red) dashed line) and CP7

Grahic Jump Location
Figure 14

Time-space plots of TKE, yaw angle, and velocity magnitude at midspan for four different clocking positions downstream of the second vane row (plane D1, line 1)

Grahic Jump Location
Figure 15

Time-space plot of the total pressure fluctuation (rms) for CP6 (left plot) and CP7 downstream of the second vane (plane D3, midspan)

Grahic Jump Location
Figure 16

Time-averaged total pressure fluctuation (rms) and total pressure for CP6 ((red) dashed line) and CP7 downstream of the second vane row (plane D3, midspan)

Grahic Jump Location
Figure 17

Spanwise relative efficiency versus clocking position

Grahic Jump Location
Figure 18

Time-averaged total pressure distribution (PtD3∕PtA) for six different clocking positions downstream of the second vane in plane D3

Tables

Errata

Discussions

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