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中文摘要：
针对热声发动机中复杂的起振、消振行为，在自行研制的“驻波型热声发动机试验平台”上，开展了工质类型、加热功率、充气压力等参数对热声发动机起振、消振行为的影响规律研究。试验结果表明：当采用纯氦气和90％氦气＋10％氩气的混合气体时，系统存在一最佳的充气压力值，使起振温度和消振温度达到最低；而其余工质，其起振温度与消振温度均随着充气压力增加而逐渐提高；与此同时，由于加热功率对板叠热端温度影响较小，故采用板叠热端温度作为行为特性参数更为合理。
英文摘要：
The on-set and damping behavior of the thermo-acoustic system with the helium-argon mixtures as working fluids are investigated experimentally in the self-built test rig of Standing-Wave Thermo-Acoustic Engine. The focus is to explore the dynamic characteristics of the thermo-acoustic system during the on-set process and damping process in detail under different charging pressure, heating power and mole-fraction of the helium and the argon. The experimental results reveal that there exists an optimum charging pressure so that the on-set temperature and damping temperature reach the lowest value, when the pure helium and the helium-argon mixtures in which the mole fraction ratio of the helium and argon is equal to 90% were selected as working fluids. For the other working fluids, the on-set and damping temperature will increase along with the increase of the charging pressure. Otherwise, due to the less effect of the heating power on the hot-end temperature of the stacks, it is more reasonable to take the hot-end temperature of the stacks as characteristic parameter.
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