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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
MODELING A THERMOACOUSTIC ENGINE UNDER ROTT’S APPROACH FROM EXPERIMENTAL TRANSFER MATRICES OF A THERMOACOUSTIC CORE
Submission Author:
Bárbara Ferro , SP
Co-Authors:
Bárbara Ferro, Flávio Bannwart
Presenter: Bárbara Ferro
doi://10.26678/ABCM.ENCIT2020.CIT20-0546
Abstract
The thermoacoustic engine onsets due to the thermoviscous interaction between a gas parcel and a solid substrate when the latter is submitted to a sufficiently high temperature gradient along the direction of the acoustic propagation within a waveguide. When this contact area is larger, the thermoacoustic effect responsible for converting thermal into mechanical energy is increased. In this way, the porous material in the thermoacoustic core (TAC) is a key point within the engine. This study consists in a simulation and analysis of a previously conceived and experimentally characterized thermoacoustic engine the free software called Design Environment for Conversion of Thermoacoustic Energy in Low Amplitude (DeltaEC). Once the simulated model matches or approximate the real engine, we expect to disclosure variables that until then were hidden in the original data from the measured transfer matrices of the thermoacoustic core (TTAC), such as the temperature, heat and acoustic power, among others. The goal of this investigation is therefore to enable the editing of variables in the simulation and even in the transfer matrix itself, deliberately changing its coefficients. Based on the arbitrary performance of the engine, this altered TTAC may indicate corresponding changes, via inverse problem, in the porous material such as geometric parameters or thermophysical properties. Therefore, the resulting model may be a tool to potentially improve the performance of real systems in the stage of design.
Keywords
thermoacoustics, transfer matrix, acoustic power, Inverse problem.
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