Abstract
The interaction between surge and rotating stall in an axial flow compressor was investigated from the viewpoint of an unsteady inner flow structure. The aim of this study was to identify the key factor that determines the switching phenomenon of a surge cycle. The main feature of the tested compressor is a shock tube connected in series to the compressor outlet through a diaphragm, slits, and a concentric duplex pipe: this system allows surge and rotating stall to be generated by connecting the shock tube with the compressor, or enables the compression plane wave injection. The unsteady characteristics and the internal flow velocity fluctuations were measured in detail, and the stall cell structure was averaged and visualized along the movement of the operation point under a coexisting state of surge. A coefficient of the cell scale fluctuation was calculated using the result of the averaging, and it confirmed that the processes of inner flow structure change differed from each other according to the next cycle of the surge. The result suggests that the key factor that determines the next cycle is the transformation of the internal flow structure, particularly between the stall cell and the entire circumferential stall, in both the recovering and stalling processes.
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Abbreviations
- A c :
-
stagger angle (°)
- A Blockage :
-
rotor blades clearance (mm)
- D :
-
diameter (mm)
- N :
-
compressor rotational speed (min-1)
- RB pos :
-
rotor blades position
- T rev :
-
revolution time of rotor blade (s)
- T p :
-
relative position between stall cell and rotor
- U :
-
rotor tip speed (m/s) (= ?D3N / 60)
- V :
-
number of stator vanes
- V cir :
-
circumferential velocity (m/s)
- W p :
-
wall pressure-rise (Pa)
- Z :
-
number of rotor blades
- p s :
-
static pressure-rise (Pa)
- s :
-
flow passage cross section area
- t :
-
time (s)
- u :
-
time-averaged axial velocity (m/s)
- φ:
-
flow coefficient
- φdiv :
-
divided section of flow coefficient
- ρ:
-
atmospheric density (kg/m3)
- ψ:
-
pressure-rise coefficient
- 1 :
-
first stage
- 2 :
-
second stage
- c :
-
casing
- h :
-
hub
- n :
-
natural number
- r :
-
rotor tip
- BPF:
-
band pass filter
- CBRF:
-
coefficient of blockage ratio fluctuation
- LPF:
-
low pass filter
- DPLAT:
-
double-phase-locked averaging technique
- CDPLAT:
-
conditional DPLAT
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Acknowledgments
This research was partially supported by Grant-in-Aid for Scientific Research (C): Grant number 15K05811 from Japanese Society for the Promotion of Science.
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This research was partially supported by Grant-in-Aid for Scientific Research (C): Grant number 15K05811 from Japanese Society for the Promotion of Science.
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Sakata, Y., Ohta, Y. Coexisting state of surge and rotating stall in a two-stage axial flow compressor using a double-phase-locked averaging technique. J. Therm. Sci. 26, 38–46 (2017). https://doi.org/10.1007/s11630-017-0907-x
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DOI: https://doi.org/10.1007/s11630-017-0907-x