在工程项目实践活动中通常出現那样一种状况，通风系统出入口风速十分高，乃至做到20~30m/s之上，这时噪声挺大必须减噪解决。
In the practical activities of engineering projects, there is usually such a situation that the wind speed at the inlet and outlet of the ventilation system is very high, even above 20 ~ 30 m / s. at this time, the noise is very large and must be solved by reducing the noise.
通风系统出入口噪声这时关键由下列二种噪声源组成：
The noise at the entrance and exit of ventilation system is mainly composed of the following two noise sources:
1、通风降温设备的机械设备噪声
1. Mechanical equipment noise of ventilation and cooling equipment
2、髙速的气流噪声。
2. High speed airflow noise.
这时若要合理的降低噪声，除开要考虑到机器设备噪声以外，另外要考虑到自然通风镀锌钢板通风管道套什么清单:风速的降低。
At this time, in order to reduce the noise reasonably, in addition to considering the noise of machinery and equipment, we should also consider the list of natural ventilation galvanized steel ventilation pipe: the reduction of wind speed.
另外风速的高矮也决策了消声器的合理长短。
In addition, the height of wind speed also determines the reasonable length of muffler.
一般状况下，大家会选用自然通风变径的方法来降低气流的风速，例如将30m/s的风速降低到十米/s下列的风速。这时消声器以便更为性价比高，一般选用减速之后的气流速率设计制作消声器的长短。
In general, natural ventilation is used to reduce the wind speed of airflow, such as reducing the wind speed from 30 m / s to less than 10 m / s. At this time, the muffler is more cost-effective, and the length of the muffler is generally designed and manufactured according to the airflow rate after deceleration.
这时消声器的安裝哪个部位较为适合呢？不可以直徑安裝在变径以后，立即安裝在变径以后会造成 下列状况：
Which part of muffler is more suitable for installation? It is not allowed to install the diameter after the diameter change first, but the installation immediately after the diameter change will cause the following conditions:
1、变径后立即安裝消声器，则该点气流涡旋扩大，排风系统摩擦阻力扩大
1. If the muffler is installed immediately after the diameter change, the air flow vortex will expand and the friction resistance of the exhaust system will increase
2、消声器進口处管理地区气流赶不及充足衰减系数，立即冲进消声器，则这时消声器内具体的气流速率远高于消声通风管道系列器的设计方案气流速率。则消镀锌钢板通风管道套什么清单:声器的具体合理长短降低，消声器预期效果远不可以做到设计方案规定。
2. If the air flow in the management center area at the inlet of the muffler can't catch up with the sufficient attenuation coefficient, it will rush into the muffler immediately, then the specific air flow rate in the muffler will be much higher than that in the design scheme of the muffler series. Then what list should be set for the ventilation pipe of galvanized steel sheet: the specific and reasonable length of the sounder is reduced, and the expected effect of the muffler is far from meeting the requirements of the design scheme.
恰当的作法是将变径后的通风风管增加直徑的5~8倍后，气流做到恒定时情况再安裝消声器，这时消声器才可以做到设计效果。
The proper way is to increase the diameter of the reduced ventilation duct by 5 ~ 8 times, and install the muffler when the air flow is constant, then the muffler can achieve the design effect. 上一篇：山东通风管道制作安装|风管的三种类型
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