Laboratoire d'Acoustique de l'Université du Maine, UMR CNRS 6613, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France.
J Acoust Soc Am. 2011 Jul;130(1):145-52. doi: 10.1121/1.3592227.
The aim of this paper is to propose a method to predict the onset conditions of the thermoacoustic instability for various thermoacoustic engines. As an accurate modeling of the heat exchangers and the stack submitted to a temperature gradient is a difficult task, an experimental approach for the characterization of the amplifying properties of the thermoacoustic core is proposed. An experimental apparatus is presented which allows to measure the transfer matrix of a thermoacoustic core under various heating conditions by means of a four-microphone method. An analytical model for the prediction of the onset conditions from this measured transfer matrix is developed. The experimental data are introduced in the model and theoretical predictions of the onset conditions are compared with those actually observed in standing-wave and traveling-wave engines. The results show good agreement between predictions from the model and experiments.
本文旨在提出一种方法，以预测各种热声发动机中热声不稳定性的起始条件。由于对换热器和在温度梯度下的堆叠进行精确建模是一项艰巨的任务，因此提出了一种用于表征热声核心放大特性的实验方法。本文提出了一种实验装置，该装置允许通过四麦克风方法在各种加热条件下测量热声核心的传递矩阵。开发了一种用于从所测量的传递矩阵预测起始条件的分析模型。将实验数据引入模型中，并将起始条件的理论预测与驻波和行波发动机中实际观察到的结果进行比较。结果表明，模型预测与实验结果之间具有良好的一致性。
