论文部分内容阅读
设计搭建了太阳能热声发动机实验系统,它由双轴全自动跟踪菲涅尔透镜聚焦型集热器和小型化驻波热声发动机两大组件构成。分别对充注不同压力N_2、He、Ar三种工质的太阳能热声发动机的起振温度、起振时热声核温度分布、压力振幅进行了实验研究。结果表明,氮气、氦气和氩气在相同充气压力下,He起振温度最高,N_2起振温度最低;N_2在充气压力1.0 MPa时达到最低起振温度394.8℃,且其压力振幅对充气压力变化不敏感;Ar在充气压力1.0 MPa时达到最低起振温度418.2℃,且其压力振幅随着充气压力的升高而逐渐增加。实验结果为优化太阳能热声发动机系统的热力性能提供了实验依据。
Design and construction of a solar thermal engine experimental system, which consists of biaxial automatic tracking Fresnel lens focusing collector and miniature standing wave thermoacoustic engine two major components. The onset temperature of thermoacoustic engine, the temperature distribution of thermoacoustic nucleus and the amplitude of pressure at the onset of vibration were experimentally studied respectively with different working mediums of N_2, He and Ar charged at different pressures. The results show that under the same inflation pressure, nitrogen, helium and argon have the highest onset temperature of He and the lowest onset temperature of N_2. The lowest onset temperature of N_2 reaches 394.8 ℃ when the inflation pressure is 1.0 MPa, Which is insensitive to the change of temperature. Ar reached its lowest onset temperature of 418.2 ℃ at inflatable pressure of 1.0 MPa, and its pressure amplitude increased gradually with the increase of inflation pressure. The experimental results provide the experimental basis for optimizing the thermal performance of the solar thermoacoustic engine system.