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热声发动机的起振过程是一个产生并维持自激振荡的过程,研究热声自激振荡机理有助于进一步了解热声效应的实质.根据热声网络理论,建立了驻波热声发动机的整机网络.将热声网络比拟成电网络,利用厄米特式计算了输入热声网络的视在功流,功流平衡对应自激,在角频率虚部为零的情况下计算了热声发动机的阈值温度和运行频率.结果表明,计算值与实验值符合得较好,充气压力与阈值温度和运行频率的耦合关系大致相同.所得结论有助于进一步探究热声效应机理以及热声发动机系统的优化设计.
The start-up process of thermoacoustic engine is a process of generating and maintaining self-oscillation, and studying the mechanism of thermoacoustic self-oscillation can help to understand the essence of thermoacoustic effect.According to thermoacoustic network theory, Machine network.Comparing the thermoacoustic network into an electric network, the apparent power flow of the input thermoacoustic network is calculated by Hermitian equation, the self-excitation of the power flow balance corresponds to the self-excitation, and the heat is calculated under the condition that the imaginary part of the angular frequency is zero The results show that the calculated values are in good agreement with the experimental data and the coupling relationship between inflation pressure and threshold temperature and operating frequency are approximately the same.The conclusions obtained are helpful to further explore the mechanism of thermoacoustic effect and thermoacoustic effects Engine System Optimization Design.