Abstract
This paper presents unsteady RANS CFD analysis of ow swirl distortion induced by one-per-rev total pressure inlet distortion for two multi-stage fans. Overall fan response to the distortion is also investigated. The numerical simulations and analyses show how inlet distortion and induced temperature distortion create swirl distortion through each fan stage. The analysis of swirl generation and transfer behavior across the computational domain is discussed. Induced swirl is present upstream of the fan inlet due to the total pressure distortion. Swirl is also generated by the rotor response to the distortion and signcantly aects rotor loading. Fan stage performance variation in engine circumference is presented at three immersions. The total pressure, total temperature, and swirl distortion aect the passage shock strength and location.
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