Real Time Measurements in a Transonic Compressor
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The purpose of this brief presentation is to report work in progress at the Turbopropulsion Laboratory at the Naval Postgraduate School to determine experimentally the behavior of the flow in a transonic compressor stage. The intent is to develop an input into the design method which accounts , in some way, for the three dimensional and periodic nature of the flow. While this has been the goal of continuing research efforts, no significant change in the basic design model has been reported. The essential three dimensional nature of transonic flow is acknowledged, but no design method is three dimensional. Within the pseudo two dimensional analytical framework, secondary flows are known to become more significant as the blade loading is increased, and wall effects become important as the passage depth is decreased. While the effects are qualitatively known to be significant, the understanding that comes from favorable comparisons of observation. with analyses is lacking . First, definitive measurements from different stage designs are needed to define the relative importance of different effects and thus provide the basis for a representative analytical design model. In order to achieve higher performance from a new design without a costly empirical development process, a design model which more nearly represents the actual flow In the blade rows is essential.
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