Abstract
A thermoacoustic theory is presented for analysis of gas oscillations and time-averaged energy fluxes and energy transformations in cyclic flow regenerators. The fluctuations of pressure and velocity of the gaseous medium are transmitted along the longitudinal direction of cyclic flow regenerators in the form of acoustic wave motion. The working of cyclic flow regenerators relies on thermoacoustic effects, i.e., time-averaged energy effects caused by the thermal interaction of the oscillatory gesous fluid medium and the porous solid-matrix medium. Regenerators used in regenerative heat engines are active components in which heat energy is transformed into acoustic energy to produce acoustic power (in prime movers) or acoustic energy is consumed and transformed into heat energy to pump heat (in refrigerators). The wave equations and energy-temperature equations to describe cyclic flow regenerators have been deduced, and a set of parameters to evaluate the regenerator performance and effectiveness is proposed.
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