Analysis and Characteristics of Compressor Stall Precursor Signals in Forward and AFT Swept High Speed Compressor
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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The stall characteristic of four single-stage transonic compressor rotors were investigated as they were throttled to stall. Forward-swept, backward-swept, and straight leading edge rotors were examined. Three methods of analysis 1 windowed power spectrum densities of pressure and spatial Fourier coefficients, 2 phase tracking analysis, and 3 system identification were used to identify the first appearance of modal waves and their accompanying frequencies in order to identify a stall warning time. A direct correlation between the amount of stall warning time and the shape of the compressor characteristic was found. Specifically, if the compressor characteristic had a significant period of flat or positive slope, more stall warning was noted. It was also found that the forward-swept rotor consistently provided more stall warning time than the backward-swept and straight leading edge rotors.
- Military Aircraft Operations
- Flight Control and Instrumentation