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根据声传播规律和声场边界条件分析,在热声发动机和热声制冷机之间增加一段波导管,可以有效提高制冷机回热器的驱动声压,同时增加当地声阻抗,降低回热器平均振荡速度,减少黏性耗散.波导管传输特性的计算和分析表明:波导管的特征尺寸(包括特征长度和相对水力半径)是提高回热器声压和声阻抗的关键参数;相对水力半径和阻抗相角是影响波导管最佳特征长度的主要因素,无量纲阻抗幅值的变化将会加剧这种影响.依据波导管的声传输特性,通过选择较大的面积比和降低波导管长度实现热驱热声制冷耦合系统中的阻抗匹配设计,实现热声发动机与热声制冷机的协调工作.
According to the rules of sound propagation and the boundary conditions of sound field, adding a section of waveguide between the thermoacoustic engine and the thermoacoustic refrigerator can effectively increase the sound pressure of the regenerator of the refrigerating machine, increase the local acoustic impedance and reduce the average of the regenerator Oscillation speed and viscous dissipation.The calculation and analysis of the waveguide transmission characteristics show that the characteristic dimensions of the waveguide (including the characteristic length and relative hydraulic radius) are the key parameters to improve the sound pressure and acoustic impedance of regenerator. The relative hydraulic radius And the phase angle of impedance are the main factors that affect the optimal characteristic length of the waveguide, which will be exacerbated by the variation of the non-dimensional impedance amplitude.According to the acoustic transmission characteristics of the waveguide, by choosing a larger area ratio and reducing the waveguide length Realize the impedance matching design in the heat-driven thermoacoustic refrigeration coupling system, and realize the coordination of thermoacoustic engine and thermoacoustic refrigerator.