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基于求解可压缩流体的N-S方程,分别计算水及R134a两种液相工质在二维空间内的热声波产生及传递过程,分析初始压力及左侧壁温阶跃值对两种工质热声压力波产生的幅值及波传递到右边界后与壁面的热流交换影响情况。结果表明,初始压力对两种工质热声波产生的幅值及与向右边界换热的热流影响不大;压力幅值及右边界传热热流强度随左侧壁温度阶跃值增大而增大;在相同边界条件下,R134a可以产生更大幅值的压力波,并且与右边界换热的热流较大。
Based on solving the NS equation of compressible fluid, the generation and transmission of thermoacoustic waves in two-dimensional space of water and R134a were calculated respectively. The effects of initial pressure and left-side temperature step on the thermoacoustic pressure The magnitude of the wave produced and the effect of heat exchange with the wall after the wave has been transmitted to the right boundary. The results show that the initial pressure exerts little influence on the amplitude of the thermoacoustic waves generated by the two working fluids and on the heat flow to the right boundary. The pressure amplitude and the heat flux on the right boundary increase with the temperature of the left wall Increases; under the same boundary conditions, R134a can generate pressure wave of larger amplitude and heat flux of heat exchange with the right boundary is larger.