High Speed Acoustic Measurements in Cavities

2001 ◽  
Author(s):  
John Ross
Keyword(s):  
High Speed ◽  
Acoustic Measurements

Acoustic Measurements of High-Speed Jets from Rectangular Nozzle with Thrust Vectoring

AIAA Journal ◽  
2009 ◽  
Vol 47 (6) ◽  
pp. 1482-1490 ◽  
Author(s):  
Adam E. Goss ◽  
Jérémy Veltin ◽  
Jaehyung Lee ◽  
Dennis K. McLaughlin
Keyword(s):  
High Speed ◽  
Acoustic Measurements ◽  
Thrust Vectoring ◽  
Rectangular Nozzle

scholarly journals Mechanisms of ultrasonic de-agglomeration of oxides through in-situ high-speed observations and acoustic measurements

2021 ◽  
pp. 105792
Author(s):  
Abhinav Priyadarshi ◽  
Mohammad Khavari ◽  
Tungky Subroto ◽  
Paul Prentice ◽  
Koulis Pericleous ◽  
...  
Keyword(s):  
High Speed ◽  
Acoustic Measurements

Characterization of the Content of the Cavity Behind a High-Speed Supercavitating Body

2006 ◽  
Vol 129 (2) ◽  
pp. 136-145 ◽  
Author(s):  
Xiongjun Wu ◽  
Georges L. Chahine
Keyword(s):  
Sound Speed ◽  
High Speed ◽  
Test Facility ◽  
Direct Visualization ◽  
Acoustic Measurements ◽  
Supercavitating Flow ◽  
Flow Test ◽  
High Sound ◽  
Very High

A high speed/high flow test facility was designed and implemented to study experimentally the supercavitating flow behind a projectile nose in a controlled laboratory setting. The simulated projectile nose was held in position in the flow and the cavity interior was made visible by having the walls of the visualization facility “cut through” the supercavity. Direct visualization of the cavity interior and measurements of the properties of the cavity contents were made. Transducers were positioned in the test section within the supercavitation volume to enable measurement of the sound speed and attenuation as a function of the flow and geometry parameters. These characterized indirectly the content of the cavity. Photography, high speed videos, and acoustic measurements were used to investigate the contents of the cavity. A side sampling cell was also used to sample in real time the contents of the cavity and measure the properties. Calibration tests conducted in parallel in a vapor cell enabled confirmation that, in absence of air injection, the properties of the supercavity medium match those of a mixture of water vapor and water droplets. Such a mixture has a very high sound speed with strong sound attenuation. Injection of air was also found to significantly decrease sound speed and to increase transmission.

The Acoustically Excited Flame

1976 ◽  
Vol 98 (2) ◽  
pp. 147-157 ◽  
Author(s):  
P. J. Vermeulen ◽  
M. S. Danilowich ◽  
E. P. Heydlauff ◽  
T. W. Price
Keyword(s):  
Fundamental Frequency ◽  
High Speed ◽  
Acoustic Measurements ◽  
Frequency Range ◽  
Hydrodynamic Behavior ◽  
Measurement Frequency ◽  
Forced Vortex ◽  
Sound Amplification ◽  
Premixed Laminar

A premixed laminar propane-air flame burning at the exit of a nozzle, was acoustically excited upstream by a speaker-driver unit. Detailed acoustic measurements were made to show that sound amplification and attenuation can occur over the measurement frequency range from 50 Hz to 350 Hz. The effect of excitation strength and fuel-air ratio was also investigated. Two acoustic phenomena related by forced vortex hydrodynamic behavior have been identified, and were investigated by means of high speed schlieren photographic measurements. The generation of a one-half harmonic of the fundamental frequency was explored and explained in terms of vortex hydrodynamic behavior. The work contributes to the understanding of the origin of noise from acoustically excited combustors.

A High Speed Level Recorder for Acoustic Measurements

1935 ◽  
Vol 6 (3) ◽  
pp. 121-129 ◽  
Author(s):  
E. C. Wente ◽  
E. H. Bedell ◽  
K. D. Swartzel
Keyword(s):  
High Speed ◽  
Acoustic Measurements ◽  
Speed Level ◽  
Level Recorder
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