【摘要】 为充分利用太阳能作为驱动热源,开展了驻波型热声发动机在不同安装倾角下热力性能的试验研究。试验结果表明,热声发动机的安装倾角对热声系统的起振温度、消振温度以及起振时板叠中的温度梯度等参数有着显著的影响,当系统中氮气压力为1.3MPa时,在试验的7种角度下,最高起振温度484℃,最低起振温度428℃,该特性为选择合适角度以降低系统起振温度提供了试验依据;而当系统稳定振荡时,安装倾角的变化对系统的压比和压力振幅等热力特性的影响较小,该特性为利用自动跟踪太阳能集热器在不同角度下驱动稳定振荡的热声发动机创造了有利条件。试验结果为设计太阳能驱动的热声发动机提供了试验依据。更多还原

【Abstract】 To fully utilize solar energy as a driving heat source,an experimental study was carried out of the thermodynamic performance of a standing-wave type thermoacoustic engine installed at various inclination angles. The test results show that the installation inclination angle of the thermoacoustic engine can exercise a remarkable influence on such parameters as the vibration-initiation temperature,vibration-fading temperature of the thermoacoustic system and temperature gradient in a plate stack during the initiation of vibration etc. When the nitrogen pressure in the system has reached 1.3 MPa,at the seven angles used during the experiment,the highest vibration initiation temperature is 484 ℃ and the lowest,428 ℃. These characteristics can provide an experimental basis for choosing an appropriate angle to lower the vibration-initiation temperature of the system. When the system is in a stable oscillation state,any change of the installation inclination angle has a relatively small influence on such thermodynamic characteristics of the system as pressure ratio and pressure vibration amplitude. These characteristics create favorable conditions for driving at different angles thermoacoustic engines operating in a stable oscillation state by utilizing an auto-tracking solar energy collector. The test results can well provide an experimental basis for the design of solar-energy-driven thermoacoustic engines.更多还原