Abstract
This paper presents CFD analysis of flow swirl distortion induced by total pressure distortion and total temperature distortion for two multi-stage fans. The numerical simulations and analyses include the front block of the first fan, and the rear block of the second fan. The front block of the first fan is subject to a one/rev total pressure distortion, while the rear block of the second fan has both total pressure and total temperature distortions. The analysis of swirl generation and transfer behavior across the computational domain is discussed. Two swirl generation mechanisms are identified. One is the induced swirl at inlet of the computational domain, and the other is the swirl distortion generated by the fan rotor in response to the incoming distortions. The mechanism of the induced swirl is further understood via the comparative study of the two fans, where significant swirl is induced for the first fan, while it is not observed for the second fan.
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