THIS PROPOSAL CONTINUES AND EXPANDS ON-GOING EFFORTS TO DEVELOP AND IMPLEMENT NOVEL MEASUREMENT TECHNIQUES FOR CHARACTERIZING THE UNSTEADY FLOW IN AXIAL TURBOMACHINES AT UNPRECEDENTED RESOLUTION. THE PRESENTLY USED STEREO-PIV MEASUREMENTS IN A REFRACTIVE INDEX MATCHED FACILITY WILL BE AUGMENTED WITH METHODS FOR MAPPING 3D TIME-RESOLVED VELOCITY AND PRESSURE DISTRIBUTIONS. THESE TECHNIQUES WILL BE USED FOR ELUCIDATING UNSTEADY FLOW PHENOMENA INVOLVING E.G. ROTOR-STATOR INTERACTIONS AS WELL AS LARGE SCALE INSTABILITIES SUCH AS ROTATING STALL. ENHANCED MEANS OF ALLEVIATING THE ADVERSE EFFECTS OF ROTATING STALL USING CASING GROOVES WILL BE TESTED AND OPTIMIZED AS WELL. FURTHERMORE A WEB-ACCESSIBLE DATABASE CONTAINING ALL THE DATA OBTAINED AT JHU WILL BE ESTABLISHED ON NASA-GLENN SERVERS AND WILL BE MADE AVAILABLE TO THE COMMUNITY FOR VALIDATING NUMERICAL DATA.