What is it about?
Effect of tip injection on compressor performance under clean and distorted inflow conditions. The existing Moore-Greitzer model was extended to include the effects of static inflow distortion and tip injection. With tip injection, there was a significant improvement in compressor performance.
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Why is it important?
The effect of static inflow distortion resulted in 25% reduction in pressure rise coefficient and about 3% deterioration in stall margin over the baseline case. To improve the compressor performance, it is necessary to incorporate the active flow control technique, that is tip injection. The improvement in compressor performance saves the fuel consumption and hence reduces the travel cost.
Perspectives
After switching on the tip injection, the compressor characteristics significantly changed as compared to the baseline case. In the baseline case, abrupt stall inception was observed. However, the stall inception pattern changes to progressive stall once the tip injection was switched on. The transformation from rotating stall to surge was observed to be initiated earlier under clean flow at velocity ratio, VR=1 as compared to clean flow without tip injection. Surge inception was delayed at VR=2 and completely suppressed at VR=3.
Dr Pramod Salunkhe
Manipal University
Read the Original
This page is a summary of: Theoretical Analysis of Rotating Stall Under Static Inflow Distortion Including Effect of Tip Injection, International Journal of Turbo and Jet Engines, January 2010, De Gruyter,
DOI: 10.1515/tjj.2010.27.1.39.
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