Jet-Surface Interaction Noise Models Comparison to TMP17 and Next Steps

Brown, Cliff

关键词: JET AIRCRAFT NOISE;    SURFACE REACTIONS;    JET PROPULSION;    NOISE REDUCTION;    MODELS;    ENGINE TESTS;    ACOUSTIC NOZZLES;    COMPUTATIONAL FLUID DYNAMICS;    COMPUTERIZED SIMULATION;    PROVING;   

RP-ID  :  GRC-E-DAA-TN54517

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A set of empirical jet-surface interaction noise models, developed for single-stream round nozzles exhausting over a simple surface in a static ambient, are evaluated for use in more realistic applications that include multi-stream nozzle systems with chevrons and dihedral surface geometries. The simple-single-stream models have several advantages when used in system-level noise studies: they are robust, they are quickly computed, and they are generally applicable to a wide range of configurations. However, these models rely on a fixed noise source distribution that does not account for the presence of chevrons at the nozzle exit. The effect of this omission on the prediction accuracy is shown by this comparison to experimental data. This motivates discussion of future work to develop a more robust modeling framework that can account for generalized source distributions and more complex airframe geometries. Re: Top-Mounted Propulsion (TMP17) Test Plans.