The axial extent of the exit flowfield generated by the AFS1 StreamVane geometry was quantified both experimentally and numerically. Details of the secondary flow field is presented at six different axial spacings ranging from 0.41 diameters to 1.625 diameters downstream. Evaluation of flow feature movement was performed both qualitatively and quantitatively using pressure and swirl distortion descriptors. The results from the pressure distortion evaluation show distortion levels decrease dramatically aft of one duct diameter downstream. The swirl distortion evaluation found significant flow feature movement across the six exit planes surveyed. Based on these results, it was determined that the optimum axial spacing between the AFS1 StreamVane and the Aerodynamic Interface Plane is one duct diameter. This result was based on minimization of total pressure distortion and the ability to produce a StreamVane with the desired secondary flow features one diameter downstream.
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