Review Article
A Critical Review of Stall Control Techniques in Industrial Fans
Table 3
Matrix of stall detection techniques.
| | Technique of detection | How it works | Results |
| | Two-point spatial correlation | Finds spikes inception in the signal before the stall happens. | Valuable for analysis of prestall and stall inception [66]. | | Stochastic model | Correlates the pressure transducers’ signals on the casing over the rotor tips. Finds dips in the correlation. | Used for stall detection [67]. | | Travelling-wave-energy analysis | Uses fan dynamics to introduce the concept of travelling wave energy as a real time measure of compressor stability. | Early warning for spikes; good for high speed compressors [68]. | | Cross-correlation analysis | Searches for short wavelength disturbances recognisable as spikes that form and decay before the stall. | Finds the spike inception, but does not use the instantaneous signal [69]. | | Acoustic stall detection | Expresses the time-series signal’s changes in amplitude and frequency. | Discerns from critical and noncritical stall using an easy to understand visual waveform analysis [41]. |
|
|
