Abstract
In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, the compressed air at the exit of centrifugal compressor was re-circulated and injected to the impeller inlet by using two injection nozzles in order to suppress the surge phenomenon. The most effective circumferential position was examined to reduce the flow rate at the surge inception. Moreover, the influences of the injection on the fluctuating property of the flow field before and after the surge inception were investigated by examining the frequency of static pressure fluctuation on the wall surface and visualizing the compressor wall surface by oil-film visualization technique.
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Abbreviations
- b :
-
blade height (mm)
- D :
-
diameter (mm)
- G :
-
mass flow rate (kg/s)
- G I :
-
critical flow rate for surge inception in Injection
- G max :
-
maximum flow rate
- G N :
-
critical flow rate for surge inception in Normal
- G R :
-
flow rate in injection
- N :
-
rotational speed (r/min)
- P a :
-
measured atmospheric pressure (Pa)
- P a0 :
-
standard atmospheric pressure (Pa)
- I RSM :
-
improvement rate of surge margin (%)
- I ROR :
-
improvement rate of operating range(%)
- R RI :
-
recirculation ratio (%)
- T 0 :
-
standard temperature (K)
- T 1 :
-
measured temperature (K)
- Z:
-
number of impeller blades
- σt :
-
total pressure ratio
- 1:
-
impeller inlet
- 2:
-
impeller outlet
References
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Hirano, T., Ogawa, T., Yasui, R. et al. Effect of double air injection on performance characteristics of centrifugal compressor. J. Therm. Sci. 26, 11–17 (2017). https://doi.org/10.1007/s11630-017-0903-1
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DOI: https://doi.org/10.1007/s11630-017-0903-1