Dynamic behavior of the on-set and damping process of the thermo-acoustic engine

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.