时均流激声发动机利用流体诱导声振荡效应把自然界的风和管道气体的动能转化为声场能，可驱动热声制冷机制冷或驱动发电机和换能器发电，为风能利用提供了新思路。在国内首次搭建了正十字型时均流激声发动机实验台，以一台高压风机提供的气流模拟自然风，获得了稳定的驻波声场。在此基础上，揭示了时均流速、平均压力、斯特劳哈尔数等对时均流诱导声振荡的影响。在平均压力为106．19kPa、时均流速为50．52m／s、谐振管长度为0．96m的条件下，该正十字型时均流激声发动机谐振管内的压力振幅达6．20kPa，约为平均压力的5．80％，为时均流激声发动机驱动发电装置和热声制冷研究奠定了实验基础。
Based on the mean flow induced acoustic oscillation effect, a mean flow acoustic engine (MFAE) converts wind energy and fluid energy in pipeline into acoustic energy which can be used to drive thermoacoustic refrigerators and generators without any mechanical moving parts. It supplies a new method to wind energy utilization. With natural wind simulated by a centrifugal air fan, a MFAE with a cross-junction configuration was designed and manufactured for experimental study. Experimental results show the effect of the mean flow velocity, the mean pressure and the Strouhal number on the acoustic field characteristics. With a mean flow velocity of 50.52 m/s, a mean pressure of 106.19 kPa and a resonator tube length of 0.96 m, the maximum pressure amplitude of 6.20 kPa was achieved, which was about 5.80% of the mean pressure. It has laid a good foundation for driving power generation devices and thermoacoustic refrigerators by the MFAE.
参考文献
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