Energy transfer modelling of thermoacoustic engines with boundary resonant control

Abstract

This paper presents the thermoacoustic engines with internal heating of mean flow and external heat-excitation of acoustic vibration, which have much larger power ratings than conventional types. In the modelling, the conservation of thermoacoustic storage is formulated to figure out engine cycles, capable of quantifying the effects of working gas and working frequency on power ratings, as well as shaping engine chamber adaptable to mechatronic load in power transmission. Moreover, this conservation law can be applied to identify through energy-loss measurement the parametric modelling upon flow leakage at the load end. Meanwhile, with the spatiotemporal transfer-function, the coupling of Rijke chamber dynamics and load dynamics is represented by feedback interconnection, which transforms the overall design into a feedback system. Based on such an internal feedback construction, digital signal processing is implemented to do numerical calculations on engine cycles with different frequencies of excitation.