Experimental study in thermodynamic performance of solar powered thermoacoustic engine

In this paper?a experimental system of solar powered thermoacoustic engine has been designed and set up, which consists of two major components(a dual-axis automatic tracking Fresnel lens-focusing collector and a small standing wave thermoacoustic engine). Filling in different pressure nitrogen, helium and argon gas respectively, onset temperature, onseting temperature distribution of thermoacoustic core and pressure amplitude of solar powered thermoacoustic engine has been studied. The experimental results show that the onset temperature of He is highest and N₂ is lowest under the same pressure. When the injection pressure of N₂ is 1.0 MPa, the system reaches the lowest onset temperature 394.8°C, and at the same temperature, the pressure amplitude of N₂ keeps constant as the injection pressure increasing. When the injection pressure of Ar is 1.0 MPa, the system reaches the lowest onset temperature 418.2°C, and at the same temperature, the pressure amplitude of Ar rises as the injection pressure increasing. These results provide the experimental basis for optimizing thermodynamic performance of the solar powered thermoacoustic engine system.