论文部分内容阅读
抗性消声器的消声性能与管口辐射特性密切相关。本文主要研究存在气流时管口声阻抗的变化。在实验室管道系统中,测定了管口声压反射系数以及声阻抗的变化,并与理论分析的结果加以比较,提出了相应的半经验半理论公式。实验结果与理论计算符合良好。理论与实验都表明,气流对管口的反射系数与声阻抗有一定的影响。当反射系数接近1时,随气流速度的增高,管口辐射声功率将明显变化。
Muffler muffler resistance and nozzle radiation characteristics are closely related. In this paper, we mainly study the change of acoustic impedance in the presence of air flow. In the laboratory pipeline system, the change of sound pressure reflection coefficient and acoustic impedance of the nozzle was measured, and compared with the theoretical analysis, the corresponding semi-empirical semi-theoretical formula was proposed. The experimental results are in good agreement with the theoretical calculations. Both theory and experiment show that the air flow has a certain influence on the reflection coefficient and acoustic impedance of the nozzle. When the reflection coefficient is close to 1, with the increase of air velocity, the radiated sound power will change obviously.