Abstract
Calculations of broadband noise from pre‐ and post‐swirl turbomachines are compared to recent wind‐tunnel data. The inflow cases addressed are: (1) grid‐generated turbulence for which near‐homogeneous conditions prevailed (for the pre‐swirl case); and (2) sharply inhomogeneous turbulence encapsulated within the wakes of the rotating upstream blades (for the post‐swirl case). Computed results help explain the degree to which strip aerodynamics succeeds in reproducing the noise data, particularly upon comparison to more rigorous estimates that account for spanwise wave numbers in the flow‐to‐lift transfer function. The paper also reports on the merit of basing the calculation of broadband noise on a circumferentially averaged inflow for case (2), whose turbulence is thereby rendered artificially homogeneous. The presentation ends with a discussion of the experimental and numerical means whereby the size of the predominant integral scale of the wake‐encapsulated turbulent flow was determined, and the extent ...
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