时均流激声发动机是基于流体诱导声振荡效应的新型能量转化装置,可将时均流的动能转换为声场能,用于驱动热声制冷机或发电装置。通过改变发动机中谐振管和驱动管连接处的几何形状,探究了几何形状对谐振管内声场的影响。在平均压力为105.52kPa、时均流速为50.16m/s、谐振管长度为O.96m的条件下,圆角型连接时均流激声发动机谐振管内的压力振幅达9.39kPa,相较于直角型增大了3.20kPa,表明圆角型连接在一定条件下有利于提高声振荡强度,该结果对于时均流激声发动机的性能优化具有指导意义。
The mean flow acoustic engine is a new type of energy conversion device based on the mean flow induced acoustic oscillation effect. It converts wind energy and fluid energy in pipeline into acoustic energy which can be used to drive thermoacoustic refrigerators and transducers. The effect of geometric shape on the acoustic field is revealed by changing the geometric shape of the cross-junction between driver tube and resonator tubes in the mean flow acoustic engine. With a mean pressure of 105.52 kPa, a mean flow velocity of 50.16 m/s, and a resonator tube length of 0.96 m, a pressure amplitude of 9.39 kPa was achieved in the case of a cross-junction configuration with rounded edges, which is higher than that with sharp edges by 3.20 kPa. The experimental result shows that the cross-junction configuration with rounded edges is conducive to enhance the acoustic oscillation. The results are of instructive significance for performance optimization of the mean flow acoustic engine.