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中文摘要：
热声现象中广泛存在非线性效应，其中最典型的就是热声自激起振。本文建立了一个四分之三波长的Rijke管计算模型，基于并行计算，采用数值模拟对其起振现象进行了模拟。研究了不同初场对起振行为的影响，得出起振后的气体振荡频率，并对管内的流动与换热规律进行了详尽分析。模拟结果与文献结果相吻合。本文工作有助于更多地了解热声起振现象，同时也为我们开展热声问题的介观模拟提供了有力的参考。
英文摘要：
Thermoacoustic phenomena are almost nonlinear, which features self-excited onset. In this paper, a closed-open Rijke tube with the heat source placed at the middle of the tube is modeled. Based on parallel computation, onset of the Rijke tube is carried out numerically. Onset phenomena with various initial fields are observed. Oscillating frequency of the gas within limit cycle is obtained. The gas flow and heat transfer characteristics are studied. These numerical results agree well with those from previous numerical simulations. Such work is helpful for better understanding on the thermoacoustic phenomena, and offers a reference for the study of the thermoacoustic problems with mesoscopic methods such as the lattice Boltzmann method.
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