VELOCITY SURVEYS IN A TURBINE STATOR ANNULAR-CASCADE FACILITY USING LASER DOPPLER TECHNIQUES

摘要

A laser Doppler velocimeter (LDV) was used to determine the flow conditions downstream of an annular cascade operating at an exit critical velocity ratio of 0. 87. Two modes of LDV opera¬tion (continuous scan and discrete point) were investigated. Conventional pressure probe measurements were also made for comparison with the LDV results. Biasing errors that occur in the LDV measurement of velocity components were also studied! In addition, the effect of pressure probe blockage on the flow conditions was determined with the LDV.