1/3-Octave Analysis of Core/Combustor-Noise Measurements for the DGEN Aeropropulsion Research Turbofan with Application to Noise Prediction

Hultgren, Lennart S ; Boyle, Devin K ; Henderson, Brenda S

关键词: ACOUSTIC PROPERTIES;    AERODYNAMIC NOISE;    AIRCRAFT ENGINES;    COMBUSTION CHAMBERS;    COST EFFECTIVENESS;    FAR FIELDS;    NOISE MEASUREMENT;    NOISE PREDICTION;    OCTAVES;    PROPULSION SYSTEM PERFORMANCE;    TEST STANDS;    TURBOFAN ENGINES;   

RP-ID  :  GRC-E-DAA-TN68115

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

This work continues the analysis of data obtained during a 2017 NASA DGEN Aeropropulsion Research Turbofan (DART) core/combustor-noise baseline test in the NASA GRC Aero-Acoustic Propulsion Laboratory (AAPL). The DART is a cost-efficient testbed for the study of core-noise physics and mitigation. Acoustic data were simultaneously acquired using the AAPL overhead microphone array in the engine aft-quadrant farfield, a single midfield microphone, and two infinite-tube-probe sensors for unsteady pressures at the core-nozzle exit. The data are here examined on an 1/3-octave basis as a first step in extending and improving core-noise prediction capability.