Acoustic Directivity and Insertion Loss Measurements of Advanced Liners Installed the Inlet of the DGEN Aeropropulsion Research Turbofan

Sutliff, Daniel L ; Jones, Michael G ; Nark, Douglas M

关键词: AEROACOUSTICS;    AIRCRAFT ENGINES;    BROADBAND;    ACOUSTIC PROPERTIES;    TURBOFAN ENGINES;    TURBOFANS;    TEST STANDS;    INSERTION LOSS;    LININGS;   

RP-ID  :  NASA/TM-2019-220161,E-19677

学科分类：声学和超声波

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The NASA Glenn Research Center’s DGEN Aeropropulsion Research Turbofan (DART) is based on the Price Induction DGEN380—a small, ~500-lbf thrust class, high-bypass, geared-turbofan engine with a separate flow nozzle. The general characteristics of the DART make it an ideal candidate for utilization as a test bed for engine aeroacoustic research in a relevant performance environment. The DART was used to document the efficacy of acoustic liners installed in the inlet of the DGEN380. An advanced multi-degree-of-freedom liner (MDOF) was designed and tested, along with a traditional single-degree-of- freedom liner (SDOF), and those results compared to a hard-wall baseline inlet. Farfield acoustic data were acquired from an external array, evaluated, and reported here-in terms of overall, broadband, and tonal components of the insertion loss.