Performance Analysis of Centrifugal Compressors Considering Stage Loading and Tip-Clearance Flows
Keywords:
Centrifugal Compressor, Tip Clearance, Stage Loading, Casing Static Pressure, Experimental InvestigationAbstract
The present work reports the measurement of periodic static pressures on the casing above the impeller of a low-speed centrifugal compressor under varying stage loadings and tip clearances. The periodic pressure data were acquired using the PLEAT technique. Experiments were conducted on a low-speed centrifugal compressor equipped with an unshrouded impeller. The performance characteristics showing the variation of discharge pressure with volume flow rate for different tip clearance (2%, 4%, 6% and 8%). Measurement of periodic pressure at various tip clearance (2%, 4%, 6% and 8%). For each tip clearance pressure measure in radial location of impeller (12 positions) for different flow co efficient value. Twelve holes were provided on the casing, fitted with adapters to house fast-response pressure transducers (Kulite XCS-062, 5 psid). These transducers measured the static pressure in terms of voltage signals. Since the raw voltage output was very low, it was amplified and then converted into digital values for further data processing. Representative results are presented and discussed. The measurements clearly indicate the presence of tip clearance flows, and the influence of both tip clearance and stage loading on these flows is highlighted.
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