Abstract
Self-excited tonal sound often appears in engineering systems with mean flow and heat release. To assist students in learning about acoustic instabilities in resonators, a modular low-cost system was constructed and a series of experiments was developed. The experimental setup consists of pipe sections with baffles, damping chamber, air blower, nichrome-wire heater, and piezoelements. The system can operate as a Rijke tube, thermoacoustic engine, vortex-excited resonator, and harvester of acoustic power. Tests carried out with this system include (i) identification of instability domains in the controllable parametric space of the system geometry, mean flow rates, and supplied heat; (ii) investigation of transient phenomena, such as growth and attenuation of sound amplitude; (iii) demonstration of nonlinear effects, such as hysteresis in the system behavior and frequency locking; and (iv) harvesting of energy of self-excited sound using piezoelements. The observed phenomena are interpreted with help of simplified theoretical models. [Work supported by the NSF Grant No. 0853171.]
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