View source for Reduction of Bleed Valve Bandwidth Requirements for Control of Rotating Stall using Continuous Air Injection

{{HTDB paper
| authors = Simon Yeung and Richard M. Murray
| title = Reduction of Bleed Valve Bandwidth Requirements for Control of Rotating Stall using Continuous Air Injection
| source = 1997 Conference on Control Applications
| year = 1997
| type = Conference paper
| funding = AFOSR
| url = http://www.cds.caltech.edu/~murray/preprints/ym97-cca.pdf.gz
| abstract = 
This paper describes a technique for reducing the actuator rate
requirement in active control of rotating stall and surge on
compressors.  Actuation of the compressor characteristic, via the use
of continuous air injection at the rotor face in a single-stage, low
speed axial compressor, has been experimentally verified to provide a
method of reducing the actuator rate requirement of bleed valve
control of rotating stall.  With a compressor rotor frequency of 100
Hz, active control of stall with a high speed bleed valve is achieved
only when the compressor characteristic is actuated.  Furthermore, the
experiments show that the bleed valve rate requirement is reduced from
approximately 145 Hz to below 10 Hz when the amount of compressor
characteristic actuation is increased.  Theoretical tools based on a
low order model (1-3 states) and simulations based on a reduced order
distributed model (37 states) have been developed to estimate the gain
and rate requirements of the bleed controller.  All of the analytical
formulas and simulations share the same qualitative trends with
respect to the second and third derivatives of the compressor
characteristic function evaluated at the peak, and the experiments.
The agreement implies that bleed valve control of rotating stall
depends crucially on the rate limit of the bleed valve which in turn
depends on both the stable and the unstable part of the compressor
characteristic.  Actuation of the compressor characteristic is
concluded to be a valuable tool in circumventing the rate limitation
of bleed valves for control of stall.  By combining the compressor
characteristic identification tools and the analytic relations,
insights for designing a compressor-bleed pair are provided.

| flags = 
| filetype = PDF
| filesize = 163K
| tag = ym97-cca
| id = 1997b
}}