Abstract

This paper describes new calculations of broadband stator noise from the ingestion of rapidly distorting turbulence. The stator blades may be thick, cambered, and at an arbitrary angle of attack relative to upstream infinity. The new numerical tool applies Notre Dame’s Euler code “CASGUST” to compute the basic influence function for gust ingestion by a cascade in freefield. i.e., in the absence of a finite-length diffraction duct, or cowl. The theory accounts fror spanwise variations in the building-block input gusts, on the resulting blade loading patterns, and so also on the computed nearfield and farfield pressures, the predictions of broadband radiated stator noise address observer positions both in the aircraft and ground reference frames. They are in the form of frequency spectra for any prescribed ray direction, and of directivity patterns for any chosen frequency.

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