Abstract
This paper presents an assessment of the tool PropNoise, developed by DLR Berlin, and of classical Heidmann-type empirical models to predict fan noise variations between different engines and/or different fan operating conditions. Predictions are compared to experimental data from a model fan rig test and static full-scale engine tests. Both PropNoise and Heidmann models predict reasonably well the fan noise trends with varying operating conditions, with some limitations for PropNoise at high fan speeds. However, PropNoise predicts significantly better the fan noise variation between two different turbofan engines than Heidmann models. A parametric study is also presented, in which fan noise predictions are compared for varying operating conditions, fan-stator spacing and stator sweep angle.
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