1D ADAPTIVE MEASUREMENT GRID FOR IMPROVED PNEUMATIC PROBE MEASUREMENTS

The subject of this paper is a flow-adaptive measurement grid developed for pneumatic probe measurements in turboma-chinery flows. The performance of the algorithm is demonstrated by a circumferential traverse at a constant radial position with a pneumatic 5-hole probe in an annular cascade wind tunnel. Compared to a conventional equidistant measurement grid, the algorithm automatically computes the amount of measurement points needed for a high resolution of the pressure distribution in steady flow fields. The algorithm is fully automated and approx-imates the pressure distribution of a preliminary transient mea-surement very accurately. Even though the spacing of the com-puted measurement points differs significantly from an equidis-tant grid, post-processing corrections related to the probe head geometry can still be applied. Accompanying a redistributio