Computed Linear/Nonlinear Acoustic Response of a Cascade for Single/Multi Frequency Excitation

By: Administration (Nasa), National Aeronaut

This paper examines mode generation and propagation characteristics of a 2-D cascade due to incident vortical disturbances using a time domain approach. Full nonlinear Euler equations are solved employing high order accurate spatial differencing and time marching techniques. The solutions show the generation and propagation of mode orders that are expected from theory. Single frequency excitations show linear response over a wide range of amplitudes. The response for multi-frequency excitations tend to become nonlinear due to interaction between frequencies and self interaction. Nallasamy, M. and Hixon, R. and Sawyer, S. Glenn Research Center NASA/CR-2004-213110, AIAA Paper 2004-2998, E-14584 NAS3-00145; WBS 781-30-09 ACOUSTICS; FREQUENCIES; EXCITATION; PROPAGATION MODES; DIFFERENTIAL EQUATIONS; FINITE DIFFERENCE THEORY; VORTICES

• Format: Paperback
• Language: English
• ISBN: B08DSS7FH9
• ISBN13: 9798669136666
• Release Date: January 1
• Publisher: Independently Published
• Length: 26 Pages
• Weight: 0.19 lbs.
• Dimensions: 0.1" x 8.5"