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对位于可听声频率范围的强声波在电站锅炉中的传播特性进行了研究.基于简单波假设理论,对声压级达到160dB的强声波传播过程中畸变和谐波生成的机理进行了分析研究,并计算了不同频率下声波的冲击波形成距离;计算得到炉内黏热流体介质中伯格斯方程的严格解,研究了发生非线性效应与耗散效应下强声波的传播特性;采用数值计算方法求解了弛豫流体介质中强声波传播的非线性波动方程,讨论了弛豫介质中声波的传播特性.结果表明:冲击波形成距离与声波频率成反比,随着声波频率的增大,非线性效应减弱,耗散效应增强.
Based on the simple wave theory, the mechanism of the distortion and harmonic generation in the process of strong sound wave propagation with the sound pressure level of 160 dB is analyzed. , And the formation distance of the shock waves of the sound waves at different frequencies was calculated. The rigorous solution of the Burgers’ equation in the viscous fluid inside the furnace was calculated. The propagation characteristics of the strong acoustic waves under the nonlinear and dissipative effects were studied. The nonlinear wave equation of the strong acoustic wave propagation in the relaxation fluid is solved and the propagation characteristics of the acoustic wave in the relaxation medium are discussed. The results show that the formation distance of the shock wave is inversely proportional to the acoustic frequency. With the increase of the acoustic frequency, The effect is weakened and the dissipation effect is enhanced.