A preliminary investigation of high amplitude standing waves with laser Doppler anemometry
Corrigan, Timothy J.
Atchley, Anthony Armstrong
Gaitan, D. Felipe
MetadataShow full item record
A previous study of thermoacoustic heat transport phenomena Atchley et al., J. Acoust. Soc. Am. 88, 251-263 (1990) reported measurements of the acoustically induced temperature difference AT generated across short, poorly thermally conducting plates situated in high amplitude acoustic standing waves. That study focused on the dependence of AT on the position of the plates in the standing wave, the mean gas pressure and acoustic pressure amplitude. For a given mean gas pressure, there was a threshold acoustic pressure amplitude above which irregularities appeared in the plots of AT vs kx. There was evidence that some velocity-dependent effect might be the cause of the discrepancies. An investigation of the acoustic velocity field in high amplitude standing waves has been initiated to determine whether there are measurable irregularities in the velocity field that can account for the observed behavior. The use of Laser Doppler Anemometry (LDA) provided accurate measurements of the velocity behavior of a gas in an empty resonator, as well as in a resonator with a crude thermoacoustic stack. Preliminary results are reported. The major conclusions are that LDA measurements of acoustic velocity fields provide reliable results and there are no significant velocity perturbations evident in our measurements. A videotape of acoustically induced flow in the resonator with a stack indicate that significant velocity perturbations do exist on time scales other than acoustic.
Approved for public release; distribution is unlimited.
Showing items related by title, author, creator and subject.
Lloyd, Roger M. (Monterey, California. U.S. Naval Postgraduate School, 1968-11);Cold flow and hot firing tests were conducted to find the optimum design and positioning of an acoustic resonator for damping high intensity pressure oscillations. The variables in the cold flow tests were the position ...
Salindong, Arthur R.; Hebert, David D. (Monterey, California. Naval Postgraduate School, 1996-12);The purpose of this thesis is to provide data on the evolution of the temperature profile in a simple thermoacoustic stack. These measurements are made to support the development of nonlinear time-dependent models of ...
Experimental and theoretical performance of a particle velocity vector sensor in a hybrid acoustic beamformer Caulk, Jeffrey V. (Monterey, California: Naval Postgraduate School, 2009-12);Acoustic measurements have traditionally relied exclusively on sound pressure sensors. This research investigated the performance of Microflown 3D hybrid pressure and acoustic particle velocity sensors in a linear array. ...