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On the other hand, parallel compressor has been developed to assess only circumferential distortion.
This flow separation leads to a significant increase in circumferential distortion at the fan face.
When the injection rate is higher than this range, the flow is degraded and the distortion contour is changed from 90° circumferential distortion pattern to 180° circumferential distortion pattern.
The results show that the new door geometry is successful in reducing circumferential distortion of the flow Mach number near the fan face by 30% compared to the baseline configuration.
The influence of the struts on this separated flow resulted in a strong secondary flow pattern, creating a region of large circumferential distortion at the fan face near the centerbody.
Between inlet throat Mach number 0.2 and 0.5, the strong flow separation in the second S-turn is suppressed at an optimum jet flow ratio of less than 0.65%, resulting in a maximum improvement of 4% for pressure recovery coefficient and a maximum decrease of 75% for circumferential distortion intensity at cruise.
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The present paper is aimed to understand the stall inception phenomenon and its propagation in a low speed, contra rotating axial flow fan stage, operating with circumferential inflow distortion.
As a parallel effort to complement the experimental study on the aeroacoustics of an axisymmetric supersonic inlet, a computational study was conducted to provide a better understanding of the mechanism that generates the circumferential flow distortion at the fan face.
While there is no measurable difference in the total pressure recovery for the two inlet configurations, there is, however, a significant increase in the circumferential flow distortion at the fan face for the higher throat Mach number test case.
The study reveals that under circumferential inflow distortion, the stall incepts at higher mass flow compared with clean flow and the stall emerges first at the distorted sector and it propagates circumferentially based on the rotational direction of the two rotors.
This is due to the competition between AFD distortion and circumferential lattice extension in releasing the elastic energy in BaTiO3 material.
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