Accession Number:

ADA273820

Title:

Analysis and Characteristics of Compressor Stall Precursor Signals in Forward and AFT Swept High Speed Compressor

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

125.0

Abstract:

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.

Subject Categories:

  • Military Aircraft Operations
  • Flight Control and Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE