基于热声网络理论的驻波热声发动机起振模拟

o study the onset conditions of a standing wave thermoacoustic engine and understand the mechanism of thermoacoustic oscillation, the onset process of a standing wave thermoacoustic engine was simulated based on the thermoacoustic network theory. Using the control differential equations of linear thermoacoustic theory, three formulas for calculating the transfer array of the stack were derived. Through the comparison, the accuracies of the three formulas were obtained. Based on the thermoacoustic network theory, a self-designed standing wave thermoacoustic engine was simulated. The onset temperatures and frequencies in different charging pressures and stack spaces were calculated and compared with the experimental results. The variation trend of calculated onset temperature by charging pressure was almost the same as experimental result. The calculation results also indicated that different stack spaces should be chosen for different charging pressures. For the standing wave thermoacoustic engine in this paper, the optimum stack space should be 2.2~2.3 times of thermal penetration depth.