研究表明，消声器的性能随消声器形状、结构、端面面积、自由面积和长度的变化而变化。风管消声器可定义为:1）风机-空气原动机2）空气通过直风管的通道3）空气流经弯管、支管、混合箱、杆、孔口和其他元件等风管部件的影响，从而在空气处理系统内降低湍流气流产生的噪音的装置。我们可以概括地说，任何形式的空气运动都会产生噪音。如果V是直管道中的气流速度，则声功率级可能是V5到V7的函数，具体取决于频率和管道组件。 这意味着，每次速度加倍或减半时，管道内气流产生的噪声可能会增加或减少15至21 dB。然而，我们将在这里关注消音器本身的噪声产生机制，而不是管道中气流噪声的一般产生机制，这在其他地方讨论。我们将讨论两种类型的消声器:矩形和圆形。矩形分离器消音器的一般配置包括一个坚固的穿孔钢外壳，其中包含吸声材料，将气流/气流分成更小的消声通道。 矩形消声器用于矩形管道，有时也用于风机入口和排气口的大型排风管。乍一看，管状或圆形消声器的横截面与矩形消声器相似，但由一个外圆柱壳和一个内同心子弹组成。圆形消音器通常与叶片轴流风机一起用于圆形管道系统。引文:研讨会，ASHRAE交易，第87卷，第一部分，伊利诺伊州芝加哥

This paper shows that silencer performance varies with silencer shape, configuration, face area, free area and length.Duct Silencers can be defined as devices which will reduce noise inside airhandling systems when generated due to turbulent airflow by :1) The fan - the air prime mover2) Passage of air through straight ducts3) Impact of air flowing through duct components such as elbows, brances, mixing boxes, rods, orifices and other elements.We can generalize that any form of air movement will generate noise. If V is the velocity of airflow in a straight duct the sound power level may be a function of V5 to V7 depending on frequency and duct component. This means that the noise generated by airflow inside a duct may increase or decrease by 15 to 21 dB every time the velocity is doubled or halved. However, we will concern ourselves here with the noise generating mechanism of silencers themselves rather than with the mechanism of airflow noise generation in ducts in general, which is discussed elsewhere.We will discuss two types of silencers: rectangular and round. The general configuration of the rectangular splitter silencer consists of a strong perforated steel envelope containing sound absorptive materials, that divides the air/gas flow into smaller sound attenuating passages. The rectangular silencer is used in rectangular ducts and in sometimes very large banks on the intakes and exhausts of fans.Tubular or round silencers, at first sight are similar in cross-section to the rectangular ones, but consist of an outer cylindrical shell and an inner concentric bullet. The round silencer is often used in round duct systems in conjunction with vane-axial fans.