Abstract
The influence of different convergent sections of otherwise identical nozzles on the damping of acoustically excited first tangential (1T) modes without mean flow has been examined. Mode excitation was provided by a variable frequency acoustic siren fed by compressed air and controlled by a 3-D printed, spring-activated gate-valve installed between the nozzles and siren, which acted to eliminate the passage of acoustic driving when closed. Nozzle damping was evaluated by experimentally measuring decay rates derived from a linear fit of the natural logarithm of attenuating pressure traces recorded by pressure transducers. Experiments performed with a conical (C), equal-radius-of-curvature (ER), and linear-velocity-profile (LVP) nozzle demonstrate that the ER nozzle provided the most 1T nozzle damping under no mean flow conditions.
| Original language | English |
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| Title of host publication | AIAA SPACE and Astronautics Forum and Exposition |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| ISBN (Print) | 9781624104831 |
| DOIs | |
| State | Published - 2017 |
| Externally published | Yes |
| Event | AIAA Space and Astronautics Forum and Exposition, SPACE 2017 - Orlando, United States Duration: Sep 12 2017 → Sep 14 2017 |
Publication series
| Name | AIAA SPACE and Astronautics Forum and Exposition, SPACE 2017 |
|---|---|
| Volume | 0 |
Conference
| Conference | AIAA Space and Astronautics Forum and Exposition, SPACE 2017 |
|---|---|
| Country/Territory | United States |
| City | Orlando |
| Period | 09/12/17 → 09/14/17 |
Funding
Funding for this work was provided by the University of Tennessee Space Institute. The authors would like to recognize the University of Tennessee Space Institute and Gloyer-Taylor Laboratories, LLC. for their support during the execution of this work. The authors would also like to thank Jonathan Kolwyck and Andrew Davis of the Technical Research Support Group (TRSG) at UTSI for their outstanding technical support, and Jack LeGeune and Gary Payne of UTSI for their excellent machining work.