Evaluation of L2F-Measurements in Unsteady Turbine Flow,
DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V COLOGNE (GERMANY F R)
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The L2F-velocimeter is a suitable device with which to perform experimental studies on instationary effects in turbomachines. This report describes the execution and the evaluation of L2F-measurements within and near the rotor blade channel of a single-stage, cold air test turbine. The measurements provide information on instantaneous distribution of the 2-D flow vector as well as the components of random fluctuating velocity. The turbine rotor flow is periodically unsteady, because of the upstream inlet guide vanes. In order to ensure the almost complete reconstruction of all possible rotor-to-stator orientations, the discrete measurements are evaluated by combining a local and chronological interpolation procedure. Discussion of experimental uncertainties in this application of the L2F-technique is included.
- Fluid Mechanics
- Jet and Gas Turbine Engines