An Approach for Fan Stage Conceptual Design with Non-Axisymmetric Stators in Presence of Distortion
Denney, Russell K.
Mavris, Dimitri N.
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Advances in the study of distortion warrant the consideration of non-axisymmetric flow field impacts on fan designs. The lack of a method that considers such impacts in early design motivates this work. An approach to design a fan stage in the presence of distortion is developed and illustrated here. In the proposed approach, an extension of the multi-meanline method accounts for flow asymmetry. Blade metal angles for the rotor are designed considering minimization of overall rotor losses in presence of incidence swings. Corrections to the quasi-steady rotor exit conditions provide an approximation to the unsteady rotor response. Non-axisymmetric stators are designed to reduce stage losses. The concept of Multi-Design Point (MDP) approach in the thermodynamic cycle designs inspires this work. This approach is envisioned as a method to approximate the design point of a fan stage under distorted flow conditions.