Abstract
By operating thermoacoustic engines at high frequencies, 4 kHz and higher, the devices have characteristics which are important for many applications. Since they are resonant systems, the power density increases with frequency. Reduction of device size provides quick thermal response time in both the cooler and the prime mover. Moreover, small device size makes it practical to incorporate them into arrays, which can handle large powers. Most important is the fact that small devices make it simple for operation at high pressures in working gas without exceeding strength of materials limitations. This leads to high power densities. Results will be presented to illustrate how the above features affect device performance for the frequency range of 4 kHz to 21 kHz. Measurements using Particle Image Velocimetry of streaming, instabilities, and resonator mode interactions will be discussed for this high frequency range. Ultimately as the operating frequency is raised, device efficiency is limited by heat conduction along the stack and working fluid. [Work supported by the Office of Naval Research and the State of Utah.]
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