Aero-thermal flow characterization downstream of an NGV cascade by five-hole probe and filtered Rayleigh scattering measurements

In this contribution, aero-thermal flow properties behind the NGV cascade of a three-sector gas turbine combustor simulator will be investigated by means of a commercially available five-hole probe with mounted temperature sen-sor as well as laser-optical FSM-FRS diagnostics. Present limitations of the FSM-FRS technique with respect to its applicability under flow conditions experienced in the cur-rent turbomachinery setup as well as resulting measurement accuracies in the measured quantities will be examined. Based on a detailed analysis of the differences between results obtained with both methods, the probe’s intrusive effect, issues concerning the probe’s positioning as well as the impact of particular flow phenomena on the probe’s measurement accuracy will be discussed.