The influence of the probe size and geometry on the quality of fast-response measurements in turbomachines has been experimentally investigated. For investigations in the static domain (time-independent flows) probes were calibrated in two continuously operating wind tunnels in the range 0.2 < M < 1.2. For dynamic calibrations in time-variant flows model experiments in water (0.025 < k < 0.4, reduced frequency) were performed. Aerodynamic characteristics were determined for a great number of probe geometries, such as circular cylinders and wedge-type probes with varied apex angles, locations of the sensing holes, and leading edge shapes. The experiments comprised investigations in tolerance ranges for prismatic total pressure probes, yaw angle sensitivity, yaw angle, and Mach number effects on calibration and influence of dynamic yaw angle fluctuation on probe characteristics. As a result of the experiments errors due to static and dynamic aerodynamic effects could be quantified. The majority of the errors arising during measurements in turbomachines can be directly related to the probe size. An important number of these errors are systematic and can be analytically modeled and hence their influence corrected. In fluctuating flows the most severe measurement errors, which often may exceed the quantity of interest, are due to dynamic stall effects. This phenomenon, which is of transient nature and cannot be corrected, is typical for sharp wedge probes, but is not present with circular cylinders, and the effects are much smaller with very blunt wedges.
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October 1995
Research Papers
On Fast-Response Probes: Part 2—Aerodynamic Probe Design Studies
H. J. Humm,
H. J. Humm
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
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C. R. Gossweiler,
C. R. Gossweiler
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
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G. Gyarmathy
G. Gyarmathy
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
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H. J. Humm
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
C. R. Gossweiler
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
G. Gyarmathy
Turbomachinery Laboratory, ETH Swiss Federal Institute of Technology, Zurich, Switzerland
J. Turbomach. Oct 1995, 117(4): 618-624 (7 pages)
Published Online: October 1, 1995
Article history
Received:
February 4, 1994
Online:
January 29, 2008
Connected Content
This is a companion to:
A Thermocapillary Convection Experiment in Microgravity
This is a companion to:
On Fast-Response Probes: Part 1—Technology, Calibration, and Application to Turbomachinery
Citation
Humm, H. J., Gossweiler, C. R., and Gyarmathy, G. (October 1, 1995). "On Fast-Response Probes: Part 2—Aerodynamic Probe Design Studies." ASME. J. Turbomach. October 1995; 117(4): 618–624. https://doi.org/10.1115/1.2836580
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