Abstract
How much can we lower the onset temperature ratio (OTR) that is necessary for a thermoacoustic engine to start? We tried to answer this question by installing a secondary regenerator into a traveling wave engine consisting of a looped tube and a branch resonator. Factors governing the OTR were experimentally studied through measurements of the quality factor at various temperature ratios. It was found that the installation of the secondary regenerator at a suitable position drastically enhanced thermoacoustic effects while introducing a slight damping to the system. As a result, the OTR of the present thermoacoustic engine was decreased from 1.76 to 1.19, when the total number of regenerators was increased to 5.
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