Measurement of Case Wall Pressure Signatures in a Transonic Compressor Using Real-Time Digital Instrumentation
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Instrumentation, computer programs and experimental techniques were developed to record digitally and in real-time the pressure at the case wall of a transonic axial compressor. Kulite semiconductor strain gauge transducers were used to sense pressures at frequencies up to 5.7 KHz. A Hewlett-Packard microcomputer and analog-to-digital converter sampled the transducer output at 100 KHz and subsequently transferred data to an HP 9830A programmable calculator and mass memory unit for storage and reduction. A periodic flow generator for frequencies up to 10 KHz was designed and built to bench test and verify the techniques for the compressor measurements. Calibration experiments were conducted on all components of the system. Data were obtained in compressor tests at two speeds and at several throttle conditions. The data from one full rotor revolution are presented as pressure distributions across a single blade- to-blade space.
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